Product information | BENDIX MC-30 TRAILER ABS CONTROLLER System information

®

Bendix

®

TABS-6 Trailer ABS Module

ECU Cover

(Sealed)

3/8" NPT Control

Port with

Integral Filter

ECU Pin-out Label

(See Page 31)

The ECU Connector

Varies for Standard and

Premium - See Chart

Integrated

Modulator

Relay Valve

ECU Connector

Cover

(Removable)

Wheel Speed

Sensor

Connectors

The Standard TABS-6

Module uses a

5-Pin Connector

3/4" NPT

Supply Port

Four (4) 3/8" NPT

Delivery Ports

(To Brake Chambers)

Through-holes for Frame

(Chassis)

Mounting

Part Number

Label

(See Page 31)

FIGURE 1 - TABS-6 STANDARD AND PREMIUM MODULES

INTRODUCTION

The Bendix

®

TABS-6 module is an integrated trailer ABS controller and modulator for air-braked heavy-duty trailers, semi-trailers and dollies. The module acts as a relay valve during normal braking, but during ABS events, it will intervene to help improve stability. All modules include an Electronic

Control Unit (ECU) and Modulator Relay Valve (MRV) which are integrated into a single self-contained 2S/1M (two-sensor, one modulator) trailer ABS unit. The

Premium TABS-6 module

is auto-con fi gurable to control more sensors and modulators (up to

4S/3M) from its default 2S/1M.

Bendix

®

TABS-6 modules also feature:

• Internal electrical connections to the primary MRV, eliminating the need for external pigtail harnesses.

• Optional mounting to the service reservoir or to the chassis, without additional brackets.

• Blink code diagnostics and support for advanced diagnostic tools.

• Support for Power Line Carrier (PLC) communication to the towing vehicle.

• A pressure equalizing valve in the sealed ECU housing to give improved protection from water, etc.

• A locking dust cover to provide additional electrical connector and cable protection.

• A serviceable nylon fi lter to help prevent foreign material from entering the control port.

To Remove Cover Slide

Lock Tab

The Premium TABS-6

Module uses an

18-Pin Connector

TABLE OF CONTENTS

General System Information

PAGE

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Safe Maintenance Practices. . . . . . . . . . . . . . . . . . .2

Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Mounting Con fi gurations. . . . . . . . . . . . . . . . . . . . . .2

PLC Communications. . . . . . . . . . . . . . . . . . . . . . . .2

Wiring Harness (Pigtail) . . . . . . . . . . . . . . . . . . . . . .3

Power and Ground . . . . . . . . . . . . . . . . . . . . . . . . . .4

ABS Indicator Lamp . . . . . . . . . . . . . . . . . . . . . . . . .4

Wheel Speed Sensors . . . . . . . . . . . . . . . . . . . . . . .5

BR9235

™

ABS Modulator Valves . . . . . . . . . . . . . . .5

J1708/J1587 Diagnostic Link . . . . . . . . . . . . . . . . . .6

Auxiliary I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

ABS Flex

™

Program . . . . . . . . . . . . . . . . . . . . . . . . .6

Customer Scratch Pad . . . . . . . . . . . . . . . . . . . . . . .6

Power-up Sequence . . . . . . . . . . . . . . . . . . . . . . . . .6

ABS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Auto-Con fi guration . . . . . . . . . . . . . . . . . . . . . . . . . .8

Odometer Function. . . . . . . . . . . . . . . . . . . . . . . . . .8

Non-standard Tire Size. . . . . . . . . . . . . . . . . . . . . . .8

Diagnostic Trouble Code Detection . . . . . . . . . . . . .8

Partial ABS Shutdown. . . . . . . . . . . . . . . . . . . . . . . .9

Blink Code Diagnostics. . . . . . . . . . . . . . . . . . . . . . .9

Diagnostic Trouble Codes (DTCs) . . . . . . . . . . . . .10

Using Hand-Held or PC-Based Diagnostics . . . . . .13

Bendix ABS Diagnostic Tools . . . . . . . . . . . . . . . . .13

Contacting Bendix. . . . . . . . . . . . . . . . . . . . . . . . . .14

Servicing the TABS-6 Module. . . . . . . . . . . . . . . . .15

Removing the TABS-6 Module . . . . . . . . . . . . . . . .15

Service Replacement of Other ABS Controllers . . .15

Reinstallation of the TABS-6 Module . . . . . . . . . . .15

Leakage And Operational Tests . . . . . . . . . . . . . . .16

ABS Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 17-31

1

SAFE MAINTENANCE PRACTICES

WARNING! PLEASE READ AND FOLLOW

THESE INSTRUCTIONS TO AVOID

PERSONAL INJURY OR DEATH:

When working on or around a vehicle, the following general precautions should be observed at all times:

1. Park the vehicle on a level surface, apply the parking brakes, and always block the wheels. Always wear safety glasses.

2. Stop the engine and remove ignition key when working under or around the vehicle. When working in the engine compartment, the engine should be shut off and the ignition key should be removed.

Where circumstances require that the engine be in operation, EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically charged components.

3. Do not attempt to install, remove, disassemble or assemble a component until you have read and thoroughly understand the recommended procedures. Use only the proper tools and observe all precautions pertaining to use of those tools.

4. If the work is being performed on the vehicle’s air brake system, or any auxiliary pressurized air systems, make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle. If the vehicle is equipped with a Bendix

®

AD-IS

®

air dryer system or a dryer reservoir module, be sure to drain the purge reservoir.

5. Following the vehicle manufacturer’s recommended procedures, deactivate the electrical system in a manner that safely removes all electrical power from the vehicle.

6. Never exceed manufacturer’s recommended pressures.

7. Never connect or disconnect a hose or line containing pressure; it may whip. Never remove a component or plug unless you are certain all system pressure has been depleted.

8. Use only genuine Bendix ® brand replacement parts, components and kits. Replacement hardware, tubing, hose, fi size, type and strength as original equipment and be designed speci fi cally for such applications and systems.

9. Components with stripped threads or damaged parts should be replaced rather than repaired. Do not attempt repairs requiring machining or welding unless specifically stated and approved by the vehicle and component manufacturer.

10. Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition.

11. For vehicles with Automatic Traction Control (ATC), the ATC function must be disabled (ATC indicator lamp should be ON) prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving.

2

COMPONENTS

Installations of the TABS-6 Module typically utilize the following components:

• Bendix

®

WS-24

™

wheel speed sensors (2 or 4, depending on con fi guration). Each sensor is installed with a Bendix Sensor Clamping Sleeve. See page 5.

• Bendix

®

BR9235

™

Pressure Modulator Valves (0, 1, or

2 depending on con fi guration). See page 5.

• Trailer-mounted ABS indicator lamp. See page 4.

• Pigtail wiring harness(es) as needed. See page 3.

MOUNTING CONFIGURATIONS

Tank (Nipple) Mount

The TABS-6 modules can be tank-mounted using a schedule 80 (heavy gauge steel) 3/4" NPT nipple directly between the trailer supply tank and the module's supply port. A tank with a reinforced port must be used.

Frame (Chassis) Mount

The TABS-6 module provides through-holes for frame mounting directly to the trailer frame rail or cross-member.

It is recommended to use two Grade 5 3/8-16 bolts, typical length 5", torqued to 180-220 in-lbs.

POWER LINE CARRIER (PLC)

COMMUNICATIONS

Since March 1, 2001, all new towed vehicles transmit a signal over the power line to an in-cab trailer ABS Indicator

Lamp. The signal, using a heavy vehicle industry standard known as “PLC4Trucks,” is typically broadcast by the trailer ABS ECU over the blue wire (power line) of the J560 connector. See Figures 2 and 3.

TABS-6 modules support PLC communications in accordance with SAE J2497.

Identifying and Measuring the PLC Signal

A TABS-6 module will continuously broadcast PLC messages that indicate trailer ABS status. At power-up or during a trailer ABS fault condition, the TABS-6 module will signal the tractor ABS unit to illuminate the dash-mounted trailer ABS indicator lamp.

Diagnostic tools are available that detect the presence of a PLC signal and perform further system diagnostics directly on the power line. For more information on these diagnostic tools, contact Bendix or refer to your local authorized Bendix dealer or distributor.

An oscilloscope can also be used to verify the presence and strength of a PLC signal on the power line. The PLC signal is an amplitude and frequency modulated signal.

Depending on the load on the power line, the amplitude of the PLC signal can range from 5.0 mV p-p to 7.0 V p-p.

FIGURE 2 - POWER LINE WITHOUT PLC SIGNAL

FIGURE 3 - POWER LINE WITH PLC SIGNAL

Suggested oscilloscope settings are (AC coupling, 1 volt/ div, 100 μ sec/div). The signal should be measured on pin

7 of the J560 connector at the nose of the trailer.

2-Pin Additional

Wheel Speed

Sensor

Connectors

(SAL & SAR)

5-Pin Power and

Indicator

Lamp (POWER/

WL)

3-Pin Modulator 2

(MOD2)

PIGTAIL WIRING HARNESSES

Several pigtail wire harnesses are available to connect the TABS-6 module with ABS and other trailer system components. Pigtail harness are weather sealed at the connector interface and are clearly labeled for proper installation. Because of the over-molded design of the

TABS-6 module wiring harnesses, Bendix recommends that the complete harness be replaced if damage or corrosion occurs.

The following connector options may be present:

Modulator 2 (MOD2), Modulator 3 (MOD3), auxiliary, diagnostic, and additional axle wheel speed sensors.

Note: All TABS-6 modules include the two primary wheel speed sensor connections and therefore these are separate from the pigtail harness.

ECU Connectors

Standard TABS-6 module ECU connectors use a TTMA

97-99 5-pin Packard Weather Pack connector for brake light power, constant power, ground, the trailer-mounted

ABS indicator lamp and a single auxiliary input/output (I/O).

Premium TABS-6 module ECU connectors use an 18-pin

Deutsch DT series connector for the same function as above, plus additional modulators, wheel speed sensors and auxiliary I/O’s.

18-Pin ECU Connector

Premium Pigtail Harness

(4S/2M with diagnostic)

4-Pin Diagnostic

Auxiliary

(Optional)

3-Pin Modulator 3

(MOD3) (Optional)

5XXX....

5XXX...

A

D

B

C

E

To TABS-6 Module

Pigtail

Modulator Extension Harness

To BR9235

™

ABS Modulator

Relay Valve

5-Pin Power and

Indicator Lamp

(POWER/WL)

Optional

Diagnostic

To Diagnostic

Tool

To TABS-6 Module

Pigtail

5XXX...

To ECU or Pigtail

Diagnostic Tool Harness

FIGURE 4 - EXAMPLES OF PIGTAIL WIRE HARNESSES AVAILABLE

Wheel Speed Sensor

Extension Harness

5-Pin ECU

Connector

Standard Pigtail Harness

(2S/1M) with optional diagnostic

To WS-24 ™ Wheel

Speed Sensor

3

Power/ABS Indicator Lamp Connector

The TABS-6 module pigtail uses a TTMA RP 97-99 5-pin

Packard Weather Pack connector for brake light power, constant power, ground and the trailer-mounted ABS indicator lamp.

The Power/ABS indicator lamp lead of the pigtail harness is available in several lengths to satisfy most installation requirements (e.g. slider axles).

Wheel Speed Sensor Connectors

Two 2-pin connectors are provided for additional wheel speed sensors for 4S ABS applications. These 2-pin connectors are labeled Additional Sensor Left (SAL), and

Additional Sensor Right (SAR). Extension cables are available in various lengths from Bendix.

ABS Modulator Connectors

On Premium TABS-6 module pigtail harnesses, one or two modulator connectors are provided for trailers using two or three modulators. These 3-pin connectors are labeled

MOD2 and MOD3. (Note: MOD1 designates the internal modulator of the TABS-6 module). Remote modulator harnesses are available in many lengths to satisfy most installation requirements.

Diagnostic Connector

Premium TABS-6 module pigtail harnesses provide a 4-pin diagnostic connection for a diagnostic tool to monitor ECU ignition power, ground and data information. Remote diagnostic cables are available from Bendix to provide a standard J1708/J1587 diagnostic port at the side of the trailer.

Auxiliary I/O Connector

Standard TABS-6 module pigtails provide an option for a single auxiliary I/O. An optional auxiliary connector provides a connection to the TABS-6 module auxiliary I/O

ECU pins. Premium ECU pigtails provides an option for up to six auxiliary I/O’s.

POWER AND GROUND

Trailer electrical power is supplied to the TABS-6 module from the ignition and brake light circuits. See Charts 1 and

2 for output values and pin locations.

Function Mode

Operating Range

ECU Active

Value

8.0 to 16.0 VDC

135 mA @ 12 VDC

ABS Active

(1 Modulator)

ABS Active

(2 Modulators)

3.7 A @ 12 VDC

5.2 A @ 12 VDC

CHART 1 – VALUES FOR OUTPUTS

Circuit

7-Pin 5-Pin 5-Pin 18-Pin

Trailer ABS ECU ECU

PLC

(Blue Wire)

Brake Light

Power

(Red Wire)

Ground

(White Wire)

Indicator Lamp

(White/green

Wire)

4

N/A

A A

E

D

CHART 2 – POWER AND GROUND

D

12

18

5

FIGURE 5 - TRAILER-MOUNTED ABS INDICATOR LAMP

ABS INDICATOR LAMP

Trailer-mounted Lamp

The TABS-6 module controls an ABS indicator lamp to show the trailer ABS status. With power supplied by the towing vehicle, the module illuminates the ABS indicator lamp by providing a 12.0 VDC signal. (The other side of the lamp is grounded.) The ABS indicator lamp output uses Pin D of the 5-pin Standard module connector, and Pin 5 of the

18-pin Premium module connector.

Dash-mounted Lamp (PLC Controlled)

TABS-6 modules use SAE J2497 standards to support

Power Line Carrier (PLC) communication. The TABS-6 module transmits a signal over the power line to the towing vehicle. This information is used by towing vehicle’s

ABS controller to know when to illuminate the trailer ABS indicator lamp mounted on the dash.

The status of the trailer ABS is transmitted over the ignition power wire (blue wire of the J560 connector), Pin B of the

5-pin Standard module connector, or Pin 6 of the 18-pin

Premium module connector.

4

BENDIX

®

WS-24

™

WHEEL SPEED SENSORS

Wheel speed data is provided to the TABS-6 module from the WS-24

™

wheel speed sensors (see Figure 6). Vehicles have an exciter ring (or “tone ring”) as part of the wheel assembly, and as the wheel turns, the teeth of the exciter ring pass the wheel speed sensor, generating an AC signal.

The TABS-6 module receives the AC signal, which varies in voltage and frequency as the wheel speed changes. (The default setting expects a 100-tooth tone ring to be used.)

Vehicle axle and ABS control con fi gurations determine if two or four wheel speed sensors are required. See page

17 for electrical system schematics showing wheel speed sensor connector pin locations.

A proper sensor installation is critical to correct ABS operation.

Typically, the WS-24

™

sensor is installed in mounting blocks that are welded to the axle housing. WS-24 ™ wheel speed sensors are protected by a stainless steel sheath. They are designed to be used with beryllium copper clamping sleeves (sometimes referred to as a “retainer bushing”,

“friction sleeve” or “clip”) (See Figure 6). The clamping sleeve provides a friction fi t between the mounting block bore and the WS-24

™

sensor.

90° Speed

Sensors

Straight Speed

Sensors

Sensor

Clamping

Sleeve

Logo Stamped into Sleeve

5. Engage the connectors, and push together until the lock tab snaps into place.

NOTE: It is important for the wheel bearings to be adjusted per the manufacturer's recommendations.

The friction fi t allows the WS-24

™

sensor to slide back and forth under force but to retain its position when the force is removed. When the WS-24 ™ sensor is inserted all the way into the mounting block and the wheel is installed on the axle, the hub exciter contacts the sensor, which pushes the sensor back. Also, normal bearing play will “bump” the sensor away from the exciter. The combination of these two actions will establish a running clearance or air gap between the sensor and exciter.

Excessive wheel end play can result in diagnostic trouble codes in cases where the sensor is pushed too far away from the tone ring.

BENDIX

®

BR9235

™

ABS

MODULATOR RELAY VALVES

Bendix ® BR9235 ™ modulator relay valves (MRV) are required when additional modulator relay valves are needed for multichannel brake systems (e.g. 2S/2M, 4S/3M

ABS con fi gurations).

The MRV is an electro-pneumatic control valve and is the last valve that air passes through on the way to the brake chambers. The normally-open hold solenoid and normallyclosed exhaust solenoid are activated to precisely modify the brake pressure on command. During normal braking, the BR9235 ™ MRV functions as a standard relay valve. As brakes are applied or released by the driver, the control signal from the tractor foot valve causes the BR9235

™

MRV to apply proportional pressure to the trailer brake chambers.

The BR9235

™

MRV is available in both tank and bracket mounting styles.

FIGURE 6 - BENDIX ® WS-24 ™ WHEEL SPEED SENSORS

1. For increased corrosion protection we recommend that a high-temperature rated silicon- or lithium-based grease be applied to the interior of the mounting block, the sensor, and to a new clamping sleeve.

2. Install the new clamping sleeve fully into the block, with the retaining tabs toward the inside of the vehicle.

Please note that WS-24 ™ wheel speed sensors must use the correct clamping sleeve to avoid problems associated with reduced retention force, such as sensor movement and resulting ABS trouble codes.

3. Gently push (DO NOT STRIKE) the sensor into the mounting block hole until it bottoms out on the face of the tone ring. Secure the cable lead wire to the knuckle/ axle housing 3-6 inches from the sensor.

4. Apply a moderate amount of dielectric non-conductive grease to both the sensor connector and harness connector.

3-Pin Modulator

Solenoid

Connector

3/8" NPT Supply

Port with Integral

Filter

Four 3/8" NPT Delivery Ports

(to Brake Chambers)

FIGURE 7 - BENDIX

®

BR9235

™

MODULATOR RELAY

VALVE

5

Tank (Nipple) Mounted

The BR9235 ™ MRV can be tank-mounted using a schedule

80 (heavy gauge steel) 3/4" NPT nipple directly between the trailer supply tank and the supply port. A tank with a reinforced port must be used.

Bracket (Chassis) Mounted

The BR9235

™

MRV provides an option with a bracket for frame mounting directly to the trailer frame rail or crossmember. It is recommended to use two Grade 5,

3/8-16 bolts, torqued to 180 – 220 in-lbs.

J1708/J1587 DIAGNOSTIC LINK

The Premium TABS-6 module provides a J1708/J1587 diagnostic link with data and power to communicate with the vehicle and various diagnostic tools. Diagnostics, testing, con fi guration, data transfer and other functions can be performed using this link. Diagnostic tools such as the MPSI Pro-Link ™ device and Bendix ® ACom ® Diagnostic

Software (version 4.0 and higher) support the TABS-6

Module.

Ignition power must be provided to the TABS-6 module for the diagnostic link to be active.

AUXILIARY I/O

The Standard module provides for one auxiliary I/O function.

The Premium module provides for up to fi ve auxiliary functions and one additional ground. See Chart 3, below.

Bendix

®

ACom

®

Diagnostic Software (version 4.0 and higher) supports the con fi guration of the TABS-6 module auxiliary I/O’s.

ABS FLEX

™

PROGRAM

The ABS Flex

™

program uses Auxiliary Design Language

(ADL) to allow customized auxiliary functions to be carried out by the TABS-6 module. Programs developed in the ABS

Flex ™ program may be downloaded at the production line or in the fi eld to control non-braking functions of the trailer.

For example, ABS Flex ™ program can potentially communicate the status of: tire in fl ation and/or temperature; reefer temperature; load presence; slider pin position; lift axle position; proximity/reverse alarm; and vehicle weight.

ABS Flex

™

programs monitor the auxiliary I/Os and/or the

SAE J1587 diagnostics and SAE J2497 PLC data links.

Contact your Bendix Account Manager to discuss an ABS

Flex

™

program for your vehicle(s).

CUSTOMER SCRATCH PAD

The TABS-6 module has a Customer Scratch Pad feature which allows the customer, or end-user, to store up to 756 bytes of information. This information can then be read using the Bendix ® ACom ® Diagnostic Software (version

4.0 and higher).

If additional scratch pad space is needed, this storage space can be expanded to 1K (1,008 bytes total of data).

Contact Bendix for further details.

POWER-UP SEQUENCE

At power-up, the TABS-6 module performs a series of selfchecks that can assist a technician to determine the ABS system status and con fi guration.

Name ECU ECU Pin Auxiliary Functions

AUX Standard C

• High-Side Driver… or Digital Input… or • Analog Input

AUX1 Premium

AUX2

AUX3

AUX4

AUX5

Premium

Premium

Premium

Premium

16 • High-Side Driver… or Digital Input




4 • Low-Side Driver… or Analog Input

AUX6 Premium 3 • High-Side Driver… or Digital Input

CHART 3 – AUXILIARY I/OS AND DEFAULT FUNCTIONS

Default Function

None

Modulator 3 (MOD3)

Modulator 3 (MOD3)

Modulator 2 (MOD2)

Modulator 2 (MOD2)

Modulator 3 (MOD3)

Common

J1587 Diagnostic Power

6

ABS System

Status Indicators

Trailer-mounted ABS

Indicator Lamp

ON

OFF

Dash-mounted Trailer

ABS Indicator Lamp

(PLC Detected)*

ON

OFF

Dash-mounted Trailer

ABS Indicator Lamp

(PLC Not Detected)

ON

OFF

Power

Application

0.5

1.5

2.0 2.5 3.0 (sec.)

*Some vehicle manufacturers may illuminate the trailer ABS indicator lamp at power-up regardless of whether a PLC signal is detected from the trailer or not. Consult the vehicle manufacturer’s documentation for more details.

FIGURE 8 - TRAILER ABS LAMP START UP SEQUENCE

Trailer ABS Indicator Lamp

At power-up without detected faults, the trailer ABS indicator lamp will turn on for 2.5 seconds as a bulb check and then turn off. See Figure 8.

If a PLC-ready towing vehicle and trailer are powered at the same time, the TABS-6 module will also trigger a bulb check on the dash-mounted trailer ABS indicator lamp.

Modulator Chuff Test at Power-Up

At power-up, the TABS-6 module activates a modulator chuff test. This electrical and pneumatic ABS modulator test can help the technician identify problems with modulator installations and/or wiring.

With brake pressure applied, a properly installed modulator will cause fi ve rapid audible chuffs of air pressure. If additional modulators are installed, the TABS-6 module activates 5 chuffs at the internal modulator (MOD1) then for each additional modulator in sequence (e.g. MOD1, then MOD2, and then MOD3). The chuff sequence is then repeated.

If the modulator is wired incorrectly, the modulator will only produce one chuff, or no chuff at all. If an issue is detected during the modulator chuff test, compare the modulator wiring and plumbing to the TABS-6 module’s electrical system schematic (see page 17) and make repairs.

ABS OPERATION

The TABS-6 module uses wheel speed sensors, modulator relay valves and an ECU to control trailer wheels by axle or by side. By monitoring individual wheel turning motion during braking, and adjusting or pulsing the brake pressure at each wheel, the TABS-6 module is able to optimize slip between the tires and the road surface. When excessive wheel slip, or wheel lock-up, is detected, the ECU will activate the Pressure Modulator Valves to modulate braking pressure at the wheel ends. The ECU is able to pump the brakes on individual wheels (or pairs of wheels), independently, and with greater speed and accuracy than a driver.

Axle Control

TABS-6 module axle control uses a single modulator relay valve to control wheels on both sides of a given axle or axles. In the case of an ABS event on road surfaces with poor traction (worn, slippery, or loose gravel roads) or areas of poor traction, (e.g. asphalt road surfaces with patches of ice), axle control will maintain the wheel that is not slipping at just under the speed that will lock the wheel. Temporary periods of wheel lock are permitted on the other wheel that is experiencing slippage.

Axle control should not be used on 5th wheel dollies or steerable axles. When braking on even surfaces, an axle-control system will perform similar to a side control, two-modulator system. Axle control is available in 2S/1M,

2S/2M and 4S/2M installations, and for Modulator 3

(MOD3) in a 4S/3M installation.

Dolly-Axle Control (Select Low)

TABS-6 module dolly-axle control uses a single ABS modulator valve to control wheels from both sides of a given axle or axles. In the case of an unbalanced braking surface, (e.g. asphalt road surfaces with patches of ice), dolly axle control will control the low coef fi cient (slipping) wheel just under the lock limit. Vehicle stability is assisted by not allowing the high coef fi cient wheel (where traction is still being maintained) to sustain wheel lock.

When braking on even surfaces, a dolly axle control system will perform similar to side control or axle control system.

Dolly axle control is only available in 2S/1M installations.

Side Control

The TABS-6 module uses a single modulator relay valve to control one or more wheels on a given vehicle side. In the case of an unbalanced braking surface, the side control will individually control wheels on each side just under the point where they would lock up.

Side control is available in 2S/2M and 4S/2M installations, and for the internal modulator (MOD1) and Modulator 2

(MOD2) in the 4S/3M installation.

Normal Braking

During normal braking, the TABS-6 module functions as a standard relay valve. If the ECU does not detect excessive wheel slip, it will not activate ABS control, and the vehicle stops with normal braking.

7

AUTO-CONFIGURATION

The Standard TABS-6 module is available only in the 2S/1M

ABS con fi guration and does not use auto-con fi guration.

For the Premium TABS-6 module, the default ABS con fi guration is 2S/1M. At power-up, if a Premium ECU detects additional sensors and modulators it will perform an auto-con fi guration. Auto-con fi guration only adjusts upward (e.g. 2S/2M Side to a 4S/2M Side con fi guration).

Additional detected components that do not conform to a legitimate con fi guration will generate the appropriate faults.

If the vehicle begins moving before the new con fi guration has been accepted, the recon fi guration will not take place at this time.

Default

Sensors

2S/1M

Dolly Axle

2S/1M

Axle

-

2

-

2

2

1

1

1

1

2

Auto-Confi guration

to 2S/2M (Side) to 4S/2M (Side) to 4S/3M (Side/Axle) to 2S/2M (Axle) to 4S/2M (Axle)

CHART 4 – PREMIUM TABS-6 MODULE AUTO-

CONFIGURATION MATRIX

ODOMETER FUNCTION

Odometer

The TABS-6 module includes an odometer function to provide a means of storing the accumulated mileage of the vehicle. The mileage is computed by utilizing information calculated from the vehicle wheel speeds.

This feature is accurate to within 0.62 miles per power-up and will typically store mileage up to 1,000,000 miles. The mileage can be displayed using PC diagnostics or through blink codes.

Whenever the module is towed using a pre-1997 tractor, the electronic odometer does not function, and the mileage can be considered out-of-calibration.

Trip Counter

The module provides a counter to record the trip mileage.

The feature is accessed through PC or hand-held diagnostic tools.

Service Interval

The TABS-6 module provides a feature that can be used to indicate a service interval for the trailer. The service interval can be accessed via PC or hand-held diagnostic tools. If con fi gured, the TABS-6 module can fl ash the indicator lamp when the vehicle is at standstill to indicate when the service interval has been exceeded.

NON-STANDARD TIRE SIZE

The module allows for tire rolling radius and tone ring tooth count parameters to be set for each axle using a diagnostic tool. These adjustments may be necessary for the module to accurately calculate the vehicle velocity and odometer mileage. Wheels of the same axle must be set to the same rolling radius and tone ring tooth count. In most cases, these parameters are set by the trailer OEM and do not need to be adjusted. In the case of a service replacement unit, always check that these parameters are set to match the vehicle.

The tire-rolling radius is defaulted to 500 revs/mile and can be adjusted from 300 to 700 revolutions per mile. Refer to the manufacturer’s tire speci fi cation for correct values.

Tone ring tooth count is defaulted to 100 teeth and can be set from 60 to 140 teeth.

DIAGNOSTIC TROUBLE CODE DETECTION

The TABS-6 module contains self-testing diagnostic circuitry that monitors the ABS components and wiring.

When the module senses an erroneous system condition, it activates the external trailer-mounted ABS indicator lamp, disables all or part of the affected ABS functions, and it stores the fault code in memory, even when the power is removed. The module also uses PLC communications to send the system status to the towing vehicle.

For some trouble codes, the TABS-6 module will automatically reset (“self-heal”) the active diagnostic trouble code when the error is corrected (e.g. when a wheel speed sensor is re-aligned). However, repeated occurrences of a given trouble code can cause the code to

“latch” - that is, be retained as active, even if the condition is only intermittent. Once the code is latched, a manual reset will be necessary. Technicians can use these latched codes to assist them in troubleshooting intermittent errors.

After the problem is repaired, trouble codes can be reset using blink code diagnostics or with a diagnostic tool.

When a trouble code self-heals or is manually reset, the code remains stored in the ECU memory. This trouble code history can be retrieved using blink code diagnostics or with a diagnostic tool.

8

PARTIAL ABS SHUTDOWN

Depending on the trouble code detected, the ABS ECU partly or completely disables the ABS functionality.

The trailer ABS system, for vehicles that only have one modulator, are disabled by any single fault. In the case of vehicles with two or three modulators, depending on the trouble code, the trailer ABS system may still provide some level of ABS function on axles/wheels that are not affected by the fault, but the ABS indicator lamp will remain on. In cases where the ABS is completely disabled, the vehicle reverts to normal braking (without ABS interventions).

Always repair ABS shutdowns at the earliest opportunity.

ECU Diagnostic Trouble Codes

All ABS functions are completely disabled. The system reverts to normal braking.

Voltage Diagnostic Trouble Code

While voltage is out of range, the ABS functionality is disabled and the system reverts to normal braking. When the correct voltage level is restored, full ABS is typically available again. The operating voltage range is 8.0 to

16.0 VDC.

BLINK CODE DIAGNOSTICS

The TABS-6 module provides diagnostic and con fi guration functions through blink code diagnostics. This means that the technician, even without diagnostic tools, can read a series of ABS indicator lamp blinks to diagnose the trouble codes being generated.

The blink code diagnostics mode is entered by providing constant power to the ignition circuit and toggling the brake light power input three times. With a parked towing vehicle attached, this is done by applying ignition power and after the power up sequence is complete, depressing and releasing the brake pedal three or more times, see chart 5 below.

Depending on the blink code mode activated, the TABS-6 module will blink the trailer-mounted ABS indicator lamp to display: active fault codes; fault code history;

ABS con fi gurations; and odometer mileage. Blink code diagnostics can also be used to reset active fault codes.

With Ignition Power

Applied, Cycle Brake

Blink Code

Action

Wait until after the modulator chuff test before activating the brake light power. Following a single display of all available messages, the ABS indicator lamp will remain on for fi ve seconds and then return to normal operating mode.

Blink code diagnostics can only be activated following a power-up, where wheel speeds have not been detected. If the vehicle moves during blink code diagnostics mode, the module will cancel the blink code diagnostics and return to normal operating mode.

Blink code diagnostics must be activated within the fi rst 15 seconds of ignition power being applied.

If brake light power is continuously applied for greater than fi ve seconds, blink code diagnostics will be disabled until the next time the ignition power is cycled.

Display Active Diagnostic Trouble Codes

To display active codes, apply ignition power and depress

/ release the brake pedal 3 times within 15 seconds.

Following activation, there will be a 5-second delay followed by a blink code display of all active fault codes. (See pages

10-12 for more information.)

Display Diagnostic Trouble Code History

To display trouble code history, apply ignition power and depress / release the brake pedal 4 times within 15 seconds. Following activation, there will be a 5-second delay followed by a blink code display of all history fault codes. (See pages 10-12 for more information.)

Reset Active Diagnostic Trouble Codes

To reset active codes, apply ignition power and depress

/ release the brake pedal 5 times within 15 seconds.

Following activation, there will be a 5-second delay followed by a blink code message of:

1-1, (System Fully Operational - No Codes Detected) or a blink code display of all remaining active fault codes.

The ABS indicator lamp will stay on if active DTCs are still present.

Resetting active fault codes with blink code diagnostics does not clear information from trouble code history. Both blink code diagnostics or diagnostic tools can retrieve trouble code history, but only diagnostic tools can erase this information.

3 times

4 times

5 times

6 times

7 times

8 times

Display Active DTCs

Display Inactive DTCs

Clear Active DTCs

Display Con

Display Odometer Mileage

Reset Con

CHART 5 – BLINK CODE INFORMATION

fi fi guration

guration

9

Display Con

fi

guration

To check the ABS con fi guration, apply ignition power and depress / release the brake pedal 6 times within 15 seconds. Following activation, there will be a 5-second delay followed by a blink code display of the module's current ABS con fi guration.

1st Digit Sensors

2

2

4

4

2nd Digit Modulators

1

1

2

2

3

3

3rd Digit ABS Control Mode

1

Axle

2

Side

3

Dolly-Axle

4

5

MOD1 Axle - MOD2 Dolly-Axle

MOD1 Axle - MOD2 Lift Axle

6

Side (MOD1, MOD2) - MOD3 Dolly-Axle

CHART 6 – ABS CONFIGURATIONS

Display Odometer Mileage

To display the trailer odometer mileage, apply ignition power and depress / release the brake pedal 7 times within

15 seconds. Following activation, there will be a 5-second delay followed by a blink code display of the odometer information (x1000).

Example: 152,431 miles will be displayed as: 152 (x1000) or 1 blink (pause), 5 blinks (pause), 2 blinks.

Zeros will be displayed by the ABS indicator lamp strobing twice.

Odometer mileage cannot be altered with blink code diagnostics. Complete odometer information can be retrieved using a diagnostic tool.

Resetting ABS Con

fi

guration

To reset the ABS con fi guration to the default con fi guration, apply ignition power and depress / release the brake pedal 8 times within 15 seconds. Following activation, the TABS-6 ABS con fi guration will reset to the default ABS con fi guration (2S/1M).

Diagnostic Trouble Codes

(DTCs)

1

2

3

4

5

2

3

4

5

4

5

2

3

4

5

2

3

4

5

2

3

4

5

1st 2nd Fault Description

Digit Digit

Repair Information

1 No faults • ABS system fully operational – no faults detected

WHEEL SPEED SENSORS (WSS)

1 SL Sensor signal valid - large air gap

1 SR Sensor signal valid - large air gap

1 SAL Sensor signal valid - large air gap

1 SAR Sensor signal valid - large air gap

2 SL Sensor signal valid - loss of signal

2 SR Sensor signal valid - loss of signal Dynamic Wheel Speed Sensor Fault.

2 SAL Sensor signal valid - loss of signal

2 SAR Sensor signal valid - loss of signal

Go to Section G, on Page 29.

3 SL Sensor signal valid – noisy

3 SR Sensor signal valid – noisy

3 SAL Sensor signal valid – noisy

3 SAR Sensor signal valid – noisy

4 SL Sensor shorted or open

4 SR Sensor shorted or open

4 SAL Sensor shorted or open

4 SAR Sensor shorted or open

5 SL Tire diameter out of range

5 SR Tire diameter out of range

5 SAL Tire diameter out of range

5 SAR Tire diameter out of range

6 SAL Sensor con fi guration error

6 SAR Sensor con fi guration error

Static Wheel Speed Sensor Fault.


• Verify correct tire size as desired.

• Verify proper tire in fl ation.

• Verify correct number of exciter ring teeth.

• Verify that the ECU has the proper tire size settings.

• Verify correct ABS con fi guration using blink codes

or other diagnostic tools.

• If needed, reset to the default ABS con fi guration and

power-up to initiate auto-con fi guration.

J1587 J1587

(SID) (FMI)

1 0

1

2

3

4

1

2

3

4

1

2

3

4

1

2

3

4

1 4 or 5

2 4 or 5

3 4 or 5

4 4 or 5

3

13

13

13

13

13

1

1

1

1

0

0

0

0

2

2

2

2

4 13

10


(DTCs)

(continued)

1st 2nd

Fault Description

Digit Digit


J1587

(SID) (FMI)

6

6

6

10

10

10

10

7

7

8

9

8

9

7

8

9

8

9

1 Over-voltage

2 Low-voltage

3 Excessive power line resistance

1 MOD1 Hold solenoid shorted or open

2 MOD1 Release solenoid shorted or open





3 MOD1 ABS modulator dynamic error



4 MOD2 Valve con fi guration error

4 MOD3 Valve con fi guration error

1 Valve MOD1/2 low-side switch shorted to ground

2 Valve MOD3 low-side switch shorted

to ground

3 ABS modulator dynamic error - all valves

4 Excessive ABS activity

POWER

• Power supply diagnostic trouble code.

Go to Section F, page 28.





MODULATOR (MOD)

• Clear faults.

• If faults return, replace the TABS-6 Module.

Static ABS Modulator Fault.

Go to Section H, on Page 30.

Dynamic ABS Modulator Fault.


• Verify correct ABS con fi guration using blink codes

or other diagnostic tools.

• If needed, reset to the default ABS con fi guration

and power-up to initiate auto-con fi guration.

COMMON

• Check for corroded/damaged wiring or connectors

between the ECU and MOD.

At the MOD harness connector, verify:

• No continuity from modulator/AUX leads to ground.

• After repairs or if no issues found, then clear faults.


Dynamic ABS Modulator Fault.


Dynamic Wheel Speed Sensor Fault.


11 1 ECU internal error

11 2 ECU fi guration error

ELECTRONIC CONTROL UNIT (ECU)

• Check for damaged or corroded connectors.

• Check for damaged wiring.

• After repairs or if no issues found, then clear faults.


• Verify correct ABS con fi guration using blink codes,

PC-diagnostics or other off-board diagnostic tools.

• If needed, reset to the default ABS con fi guration and

power-up to initiate auto-con fi guration.

251

251

251

3

4

13

42 3, 4, 5

6 or 12

48 3, 4, 5

6 or 12

43 3, 4, 5

6 or 12

44 3, 4, 5

6 or 12

49 3, 4, 5

6 or 12

50 3, 4, 5

6 or 12

7

8

9

7

7

7

8 13

9 13

7

9

7

1

254

254

4

4

7

7

12

13

(Continued over . . .)

11


(DTCs)

(continued)

1st 2nd

Fault Description

Digit Digit


J1587

(SID) (FMI)

12

13

1 J1587 diagnostics shorted or open

1 ABS lamp shorted or open

J1587 DIAGNOSTIC


between the ECU and J1587 Diagnostic.

• Verify the following:

- At the 18-pin ECU harness connector:

(a) Continuity of the J1587 Diagnostic wiring to the

lamp (auxiliary device).

(b) +12V is not measured at J1587 Diagnostic lead.

- At J1587 Diagnostic connector:

(a) No continuity of the J1587 Diagnostic lead to

ground.

(b) No continuity from J1587 Diagnostic lead to any

other ECU pin(s).

(c) Replace/repair J1587 Diagnostic wiring or

components as required.

TRAILER-MOUNTED ABS INDICATOR LAMP


between the ECU and ABS Indicator Lamp.

• Verify the following:

- At the 5-pin or 18-pin ECU harness connector:

(a) Continuity of the ABS Indicator Lamp wiring

to the lamp (auxiliary device).

(b) +12V is not measured at ABS Indicator Lamp lead.

- At ABS Indicator Lamp connector:

(a) No continuity of the ABS Indicator Lamp lead to

ground.

(b) No continuity from ABS Indicator Lamp lead to any

other ECU pin(s).

(c) Replace/repair ABS Indicator Lamp wiring or


250 3, 4, 5

or 12

81 3, 4, 5

or 12

12

Troubleshooting: Using Hand-Held or

PC-Based Diagnostic Tools

USING HAND-HELD OR PC-

BASED DIAGNOSTICS

Troubleshooting and diagnostic trouble code clearing, as well as beginning a recon fi guration, may also be carried out using hand-held or PC-based diagnostic tools such as the Bendix

®

Trailer Remote Diagnostic Unit (TRDU

™

),

Bendix

®

ACom

®

Diagnostics software, or the ProLink tool.

BENDIX ABS DIAGNOSTIC TOOLS

Bendix ® ACom ® Diagnostic Software

Bendix ® ACom ® Diagnostic Software (version 4.0 or higher) is an RP-1210A compliant PC-based diagnostic software program that provides the highest level of diagnostic support for the TABS-6 module. With Bendix

®

ACom

®

Diagnostic Software, maintenance personnel can:

• Obtain fault information (both active and inactive faults)

• Retrieve event history

• Clear inactive faults and event history

• Verify ECU con fi guration

• Perform system and component tests

• Read/write customer information on scratch pads

• Save and print information

• Receive troubleshooting assistance

When diagnosing the TABS-6 module using a PC and

Bendix

®

ACom

®

Diagnostic Software, the computer’s serial or parallel port can be connected to the vehicle’s diagnostic connector through a RP-1210A compliant communications device.

For more information on the Bendix ® ACom ® Diagnostic

Software, or RP-1210A compliant tools, contact Bendix or refer to your local authorized Bendix parts outlet.

LED lights illuminate

Diagnostic

Trouble Codes

(10 LEDs)

FIGURE 10

-

THE BENDIX ® TRAILER REMOTE

DIAGNOSTIC UNIT

Bendix

®

TRDU

™

(Trailer Remote Diagnostic Unit)

Tool

The Bendix

®

TRDU

™

tool provides the technician with a visual indication of Antilock Braking System (ABS) component

Diagnostic Trouble Code (DTC)

information.

The TRDU

™

tool is speci fi cally designed for use with

Bendix

®

Trailer ABS systems and Bendix makes no claims for its operation and/or usability with other brands of trailer

ABS.

Features of the Bendix

®

TRDU

™

Tool

The TRDU

™

tool attaches to a 7-pin to 7-pin adapter (See

Figure 12) and then into the J560 of the towing vehicle.

The TRDU ™ tool communicates across PLC.

The TRDU ™ tool allows the technician to:

• Troubleshoot ABS system component problems using

Diagnostic Trouble Code reporting via LEDs.

• Reset Diagnostic Trouble Codes on Bendix ® ABS ECUs by holding a magnet over the reset of the TRDU ™ tool for less than 6 seconds.

• Initiate a self-con fi guration event Mode used by Bendix

®

ABS ECUs by holding a magnet over the reset area for greater than 6 seconds but less than 11 seconds.

Lap Top Computer

J1708/J1587 or J1939

PDM (RP-1210A)

Parallel or Serial

Cable

FIGURE 9 - BENDIX ABS DIAGNOSTIC SOFTWARE

LED Diagnostic Trouble Codes

VLT - Power

ECU - ABS Controller

SEN - Wheel Speed

Sensor

MOD1 - Modulator 1

MOD2 - Modulator 2

MOD3 - Modulator 3

LFT - Left

RHT - Right

ADD - Additional

ODO - Odometer

Example: If the Diagnostic

Trouble Code is "Right

Additional Sensor", the

TRDU ™ tool will display one green and three red

LEDs

LEDs

Green

VLT

Blue

ODO

All others are

Red

FIGURE 11 - DIAGNOSTIC TROUBLE CODES

13

to Trailer

Connector

TRDU

™

Tool

to Towing

Vehicle

J560

Connector

Adapter

FIGURE 12 - TRDU ™ TOOL AND ADAPTER

How the Bendix

®

TRDU

™

Tool Operates

When the TRDU

™

tool is plugged into the adapter, and the adapter/TRDU

™

tool is installed between the trailer connector and the J560 connector of the towing vehicle, all the LEDs will illuminate, and the green LED will fl ash 4 times to indicate communications have been established.

If the ABS ECU has no active Diagnostic Trouble Codes, only the green LED will remain illuminated.

If the ABS ECU has at least one active Diagnostic

Trouble Code the TRDU ™ tool displays the fi rst diagnostic trouble code by illuminating the red LEDs, indicating the malfunctioning ABS component and its location on the vehicle. (See Figure 13.) If there are multiple diagnostic trouble codes on the ABS system, the TRDU ™ tool will display one diagnostic trouble code fi rst, then once that

Diagnostic Trouble Code has been repaired and cleared, the next code will be displayed.

The TRDU

™

tool repeatedly blinks out the mileage stored once communications have been established. By counting the sequence of blinks and/or strobes on the blue LED the odometer reading is given. See page 10 for more details.

•

VLT (Flashing indicates either over- or under-voltage condition)

To pinpoint the root cause and to ensure the system diagnostic trouble code is properly corrected the fi rst time, additional troubleshooting may be necessary.

Bendix

®

TRDU

™

Tool Reset Function

The magnetic reset switch is located by the letter "B" in the Bendix logo on the top of the TRDU ™ tool. Activation requires a magnet with 30 gauss minimum.

The reset operations are:

1. If the magnet is held over the switch for less than 6 seconds the "clear diagnostic trouble codes" command is sent.

2. If the magnet is held over the switch for more than 6 seconds, but less than 11 seconds, the Bendix

®

ABS

"self-con fi guration command" is sent.

Additionally, it is recommended at the end of any inspection that the user switches off and restores the power to the

ABS ECU, then check the ABS Indicator Lamp operation and TRDU ™ tool to see if they indicate any remaining

Diagnostic Trouble Codes.

MPSI Bendix Cartridge

MPSI provides a Bendix cartridge for use with the

Pro-Link ™ tool. For more information on the Bendix diagnostic cartridge from MPSI, contact Bendix or refer to your local authorized Bendix parts outlet.

PLC Diagnostic Tool

Diagnostic tools are available that detect the presence of a PLC signal and perform further system diagnostics directly on the power line. For more information on these diagnostic tools, contact Bendix or refer to your local authorized Bendix parts outlet.

CONTACTING BENDIX

www.Bendix.com

The Bendix on-line troubleshooting guide will help you determine the cause performance issues with your braking system.

Pro-Link

Heavy Duty

Multi Protocol

Cartridge

PC Card MPSI

Part Number

805013

FIGURE 14 - NEXIQ (MPSI) PRO-LINK TOOL

The Bendix on-line contacts directory will make it easy for you to fi nd the Bendix contacts you need. From this page, you can navigate to technical support contacts, service engineers, Bendix account managers, international contacts and more. Bendix.com is your complete Bendix resource.

Bendix Technical Assistance Team

For direct personal technical support, call the Bendix technical assistance team at:

1-800-AIR-BRAKE

(1-800-247-2725),

FIGURE 13 - TRDU ™ TOOL LED LOCATIONS

14

Monday through Friday, 8:00 A.M. to 6:00 P.M. EST, and follow the instructions in the recorded message.

Alternatively, you may e-mail the Bendix technical assistance team at: [email protected].

To better serve you, please record the following information before you call the Bendix Tech Team, or include this information in your e-mail:

• Bendix product model number, part number and con fi guration.

• Vehicle make and model.

• Vehicle con fi guration. (Number of axles, tire size, etc.)

• System performance symptoms: When do they occur?

• What faults have been identi fi ed using LEDs, blink codes or diagnostic tools?

• What troubleshooting/measurements have been performed?

• What Bendix service data literature do you have or need?

SERVICING THE TABS-6 MODULE

CAUTION: All TABS-6 modules are initially defaulted to 2S/1M and may auto-con

fi

gure to another ABS con

fi

guration if additional sensors and/or ABS modulators are detected. An incorrect

ABS con

fi

guration may cause fault indication or degraded ABS performance. Before and after activating a self-con

fi

guration, always check the current ABS con

fi

guration by using blink code diagnostics or a diagnostic tool.

Prior to performing service to the TABS-6 module, always perform the following steps:

1. Follow all Safe Maintenance Practices including, but not limited to, those on page 2 of this document.

2. Turn power off.

3. Drain the air pressure from all reservoirs.

4. Remove as much contamination as possible prior to disconnecting electrical connections and air hoses.

5. Note the TABS-6 module's mounting position on the vehicle.

REMOVING THE TABS-6 MODULE

1. Open the cover by sliding the locking tab to the left.

Retain the cover.

2. Disconnect the 5- or 18-pin ECU connector and the two

2-pin wheel speed sensor connectors.

3. Mark for reinstallation and then remove all air hoses and plugs connected to the module.

4. Remove the module from the vehicle by removing the mounting fasteners or by rotating the entire assembly counter-clockwise from the tank mount.

SERVICING THE CONTROL PORT FILTER

The TABS-6 module has an in-line fi lter in the control port

(See Figure 1). This fi lter should be inspected and cleaned

(if any contamination is found), every four months, 34,000 miles or 1,200 operating hours. For severe applications, this inspection interval may be reduced. If the fi lter is found to be damaged, install a replacement. The fi lter should also be inspected as part of any troubleshooting where the service brakes are slow to apply and other possible causes have been ruled out.

SERVICE REPLACEMENT OF

OTHER ABS CONTROLLERS

The TABS-6 module is designed to be used as the service replacement part for the Bendix ® MC-12 ™ ,

MC-30 ™ and A-18 ™ trailer ABS controllers. When controller service replacement parts are required, a

TABS-6 module and pigtail harness must replace the entire MC-12 ™ , MC-30 ™ or A-18 ™ controller assembly and pigtail harness. When replacing an MCE-12 ™ controller, the integral emergency function (EV-2

™ valve) must be replaced by a DC-4

®

and TR-3

™

valve combination. See pages 18-21 for plumbing details. TABS-6 module kits are available to replace MC-12 ™ , MC-30 ™ and A-18 ™ controller assemblies and harnesses. For more information, contact

Bendix or your local authorized Bendix parts outlet.

1. Disconnect the power connector and wheel speed sensors from the MC-12

™

, MC-30

™

or A-18

™

controller pigtail harness.

2. Remove all air hoses and plugs connected to the unit.

3. Remove the MC-12

™

, MC-30

™

or A-18

™

controller assembly and pigtail from the vehicle by removing the mounting bracket nuts or by rotating the entire assembly counter clockwise from the tank nipple mount.

4. Install the new pigtail, starting at the power connector and properly securing the harness every 18 inches to the ECU location.

5. Next, refer to the Reinstallation of the TABS-6 Module section.

REINSTALLATION OF THE TABS-6 MODULE

CAUTION! All TABS-6 module service replacement parts are initially defaulted to 2S/1M and may autocon fi gure to another ABS con fi guration if additional sensors and/or ABS modulators are detected. An incorrect ABS con fi guration may cause fault indication or degraded ABS performance. Before and after activating a self-con fi guration, always determine the current ABS con fi guration by activating blink code diagnostics.

Inspect the original mounting hardware: If it is in good condition, it can be reused for installation. If replacement hardware is needed, use grade-5 3/8-18 bolts, nuts and

15

lock washers for the frame-mount unit, or a schedule 80

(heavy gauge steel) ¾" nipple for the tank-mount unit.

Inspect the location selected for installation and clean as necessary.

NOTE: Inspect all components, including the replacement trailer ABS module, for any external damage, such as cracked valve ports, electronic housings, etc. Any components found to be damaged should not be installed on the vehicle and must be replaced.

1. Position and secure the unit in the original mounting orientation (the exhaust port must point straight down):

For tank-mount modules:

Install the nipple fi tting into the modulator-valve supply port. Then rotate the entire assembly into the tank port until secure. Over-torquing of the tank nipple could cause damage to the valve body.

For frame-mount modules:

Torque the mounting nuts to 180-220 in-lbs.

2. Reconnect all air hoses and plugs to the module.

Depending on the installation, additional plugs may be necessary. Make certain that no thread sealing material enters the valve. All air hoses and fi ttings should be checked for leaks prior to returning the vehicle to service.

3. Reconnect the ECU and wheel speed sensor electrical connectors to the unit. Apply a moderate amount of non-conductive electrical grease to each connector pin before reconnecting.

4. The new TABS-6 module may need to be recon fi gured for proper operation. See page 8.

5. Leakage and Operational Tests must be performed before returning the vehicle to service.

LEAKAGE AND OPERATIONAL TESTS

1. Before performing leak tests, block the wheels.

2. Fully charge air brake system and verify proper brake adjustment.

3. Make several trailer brake applications and check for prompt application and release at each wheel.

4. Check the module, modulator valve(s) and all air hose fi ttings for leakage using a soap solution:

Check the ABS solenoid body with the trailer service brakes fully applied. If leakage is excessive, more than a single 1" bubble within 1 minute, replace the module.

Check the relay exhaust port with the trailer service brakes released to be sure that leakage is less than a single 1" bubble within 3 seconds. If excessive leakage is detected at the relay exhaust port, perform the following test before replacing the module:

• Apply the trailer spring brakes. Recheck for leakage around the relay exhaust port. If the exhaust port stops leaking, this indicates a leak between the emergency and service sides of the spring brake chamber. However, if the relay exhaust port continues to leak excessively, replace the TABS-6 module.

5. Apply power and monitor the power-up sequence to verify proper system operation. See page 6.

6. Determine the current ABS con fi guration by activating blink code diagnostics or using a diagnostic tool. If necessary, reset the ABS con fi guration and allow the module to auto-con fi gure. See page 8.

7. Calibrate and set odometer parameters if necessary using a diagnostic tool. Refer to the Odometer Function section on page 8.

8. Where a safe location (e.g. restricted access area or test track) is available, it is possible to road test the ABS function by making an abrupt stop from a vehicle speed of about 20 MPH to check for proper function. The wheels should not enter a prolonged lock condition and ABS function should be audible. It is the responsibility of the technician to perform this test in a safe location.

ABS WIRING

All connector leads of the TABS-6 module pigtail harness are weather sealed at the connector interface and are clearly labeled for proper installation.

Bendix provides over-molded versions of the TABS-6 wiring harness and Bendix recommends that the complete harness be replaced if corrosion or damage occurs.

When troubleshooting ABS wiring, some general rules should be followed where applicable.

1. Check all wiring and connectors to ensure they are secure and free from visible damage (e.g. cuts, abrasions, etc.).

2. Check for evidence of wire cha fi ng due to poor routing, or poor securing, of wires.

3. Check connectors for proper insertion and locking.

4. Verify that the connector pins are properly greased with a non-conductive electrical grease compound.

5. Connector terminals must not show signs of corrosion or exposure to the environment.

6. Never pierce wire insulation when checking for continuity.

7. Do not deform individual pins or sockets during probing with a volt/ohm meter.

8. It is strongly recommended to properly secure all wiring harness and sensor leads at least every 18 inches.

9. Apply a moderate amount of non-conductive electrical grease to each connector pin before reconnecting.

16

Troubleshooting: Electrical Schematics

STANDARD

TABS-6

Trailer

ABS

Controller

FIGURE 15 - STANDARD TABS-6 MODULE (5-PIN ECU CONNECTOR) ELECTRICAL SCHEMATIC - 2S/1M

7-WAY SAE J560

CONNECTOR

1

7

4

SENSOR

RIGHT SR

1

2

TRAILER-MOUNTED

ABS WARNING LAMP

6-WAY SAE J1587

CONNECTOR

C

B

A

E

SENSOR ADD.

RIGHT SAR

MODULATOR VALVE

SENSOR ADD.

LEFT SAL

MOD2

1

2

MODULATOR VALVE

MOD3

1

2

1

2

3

SENSOR

LEFT SL

1

2

SENSOR RIGHT SR (+)

1

SENSOR RIGHT SR (-)

2

GROUND

18

IGNITION VOLTAGE

6

BRAKE LAMP VOLTAGE

12

ABS WARNING LAMP (AUX7)

5

SENSOR ADD. RIGHT SAR (+)

11

1

2

3

SENSOR ADD. RIGHT SAR (-)

17

MOD2 RELEASE

9

MOD1/2 COMMON

3

MOD2 HOLD

15

MOD3 RELEASE

10

MOD3 COMMON

4

MOD3 HOLD

16

SENSOR ADD. LEFT SAL (+)

8

SENSOR ADD. LEFT SAL (-)

14

J1587 (B)

7

J1587 (A)

1

J1587 GROUND

13

J1587 VOLTAGE (AUX6)

2

SENSOR LEFT SL (+)

1

SENSOR LEFT SL (-)

2

PREMIUM

TABS-6

Trailer

ABS

Controller

FIGURE 16 - PREMIUM TABS-6 MODULE (18-PIN ECU CONNECTOR) ELECTRICAL SCHEMATIC - 4S/3M

17

Troubleshooting: System Schematics

2S/1M - AXLE

CONTROL

Right -

“Curb-Side”

A Brake Light Power

B Ignition Power

C NC

D Warning Lamp

E Ground

A

D

B

C

E

Bendix WS-24

™

Wheel Speed

Sensor "SR"

CONTROL

LINE

Trailer

Chassis

Harness

Ignition

Power

7-PIN

CONNECTOR

Ground

SUPPLY

LINE

Brake

Light

Power

Dual Axle Trailer

5-PIN

CONNECTOR

Trailer ABS

Pigtail

Harness

ABS

ABS

Indicator Lamp

Bendix

®

SR-5 ™ Trailer

Spring Brake

Valve

Bendix

®

TABS-6

Trailer

ABS

Module

Left -

“Road-Side”

Bendix WS-24

™

Wheel Speed

Sensor "SL"

18

2S/1M - DOLLY AXLE CONTROL



C NC

D Warning Lamp

E Ground

A

D

B

C

E

Right - “Curb-Side”

Coupling - Control

WS-24 ™ Wheel Speed Sensor

"SR"

Ignition

Power

7-PIN

CONNECTOR

CONTROL

LINE

Trailer

Chassis Harness

5-PIN

CONNECTOR

Trailer ABS

Pigtail Harness

SC-3

™

Single

Check Valve

R-12P

™

Pilot Relay Valve

Ground

SUPPLY

LINE

PR-3 ™ Pressure

Protection Valve

SV-4

™

Synchronizing

Valve

Brake Light

Power

Dolly

Coupling - Supply

A B S

ABS Light

Left - “Road-Side”

DC-4 ® Double

Check Valve

Trailer

ABS

Module

TABS-6

TR-3

™

Inversion

Valve


"SL"

Ignition

Power


(continued)

2S/2M - AXLE CONTROL


"SR"




C NC

D Warning Lamp

E Ground

A

D

B

C

E

7-PIN

CONNECTOR

CONTROL

LINE

Trailer

Chassis Harness

5-PIN

CONNECTOR

Trailer ABS

Pigtail Harness

Ground

SUPPLY

LINE

SR-5

™

Trailer

Spring Brake

Valve

BR9235

™

“MOD2”

Modulator

Relay

Valve

TABS6

“MOD1”

Trailer

ABS

Module

Brake Light

Power

Dual Axle Trailer

ABS Light

A B S


WS-24

™


Installation Guidelines for the TABS-6 2S/2M Axle ABS Con fi guration:

• MOD1 (TABS-6 ABS Unit) controls the wheel(s) of a primary axle(s).

"SL"

• MOD2 (BR9235

™

Modulator Unit) controls the wheels of an additional axle(s).

• SL & SR (Primary Sensors) senses wheels on the primary axle (always on ground) that MOD1 controls.

• For lift axle applications, MOD2 controls the wheels for the lift-able axle

Ignition

Power

2S/2M - SIDE CONTROL



C NC

D Warning Lamp

E Ground

A

D

B

C

E


7-PIN

CONNECTOR

CONTROL

LINE

Trailer

Chassis Harness

5-PIN

CONNECTOR

Trailer ABS

Pigtail Harness

Ground

SUPPLY

LINE

SR-5

™

Trailer

Spring Brake

Valve

Brake Light

Power


"SR"

BR9235 ™

“MOD2”

Modulator

Relay

Valve

TABS6 “MOD1”

Trailer ABS

Module

Dual Axle Trailer

ABS Light

A B S



"SL"

Installation Guidelines for the TABS-6 2S/2M Side ABS Con fi guration:

• MOD1 (TABS-6 ABS Unit) controls the left “road-side” wheel(s) of a primary axle(s).

• MOD2 (BR9235

™

Modulator Unit) controls the right “curb-side” wheel(s) of a primary axle(s).

• For lift axle applications, SL & SR (Primary Sensors) senses the wheels of the stationary, non lift-able axle

19


(continued)

4S/2M - AXLE CONTROL

WS Sensor

"SAR"



C NC

D Warning Lamp

E Ground

A

D

B

C

E

WS-24

™


"SR"

Right -

“Curb-Side”

20

7-PIN

CONNECTOR

CONTROL

LINE

Trailer

Chassis Harness

5-PIN

CONNECTOR

Trailer ABS

Pigtail Harness

Ignition

Power

Ground

SUPPLY

LINE

SR-5 ™ Trailer

Spring Brake

Valve

BR9235 ™

“MOD2”

Modulator

Relay

Valve

TABS6

Trailer ABS

Module

“MOD1”

Brake Light

Power

ABS Light

Full Trailer

A B S

WS Sensor

"SAL"

Left -

“Road-Side”

"SL"


Installation Guidelines for the TABS-6 4S/2M Axle ABS Con fi guration:

• MOD1 (TABS-6 ABS Unit) controls the wheel(s) of a primary axle(s).

• MOD2 (BR9235

™


• SL & SR (Primary Sensors) senses wheels on the primary axle (always on the ground) that MOD1 controls, and are connected to the dedicated 2-pin connector on the TABS-6 ECU.

• SAL & SAR (Additional Sensors) senses the wheels that MOD2 controls, and are connected to the

18-pin connector on the TABS-6 ECU.

• For lift axle applications, MOD2 controls the wheels for the lift-able axle

Ignition

Power

4S/2M - SIDE CONTROL



C NC

D Warning Lamp

E Ground

A

D

B

C

E


7-PIN

CONNECTOR

CONTROL

LINE

Trailer

Chassis Harness

5-PIN

CONNECTOR

Trailer ABS

Pigtail Harness

Ground

SUPPLY

LINE

SR-5

™

Trailer

Spring Brake

Valve

WS-24 ™ Wheel Speed Sensors

"SAR" "SR"

BR9235

™

“MOD2”

Modulator

Relay

Valve

TABS6

Trailer ABS

Module

“MOD1”

Brake Light

Power

Dual Axle Trailer

ABS Light

A B S


"SAL" "SL"

WS-24

™

Wheel Speed Sensors

Installation Guidelines for the TABS-6 4S/2M Side ABS Con fi guration:


• MOD2 (BR9235

™


• SL & SR (Primary Sensors) are connected to the dedicated 2-pin connector on the TABS-6 ECU.

• SAL & SAR (Additional Sensors) are connected to the 18-pin connector on the TABS-6 ECU.

• For lift axle applications, SAL & SAR (Additional Sensors) senses the wheels of the lift-able axle.


(continued)

4S/3M - SIDE/AXLE CONTROL



C NC

D Warning Lamp

E Ground

A

D

B

C

E

Right -

“Curb-Side”

CONTROL

LINE

Trailer

Chassis Harness

5-PIN

CONNECTOR

Trailer ABS

Pigtail Harness

7-PIN

CONNECTOR

"SAR"


"SR"

BR9235 ™ “MOD3”

BR9235 ™

Modulator

Relay Valve

“MOD2”

Ignition

Power

Ground

SUPPLY

LINE

SR-5 ™ Trailer

Spring Brake

Valve

TABS-6

Trailer ABS

Module

“MOD1”

Brake Light

Power

Tri-Axle Trailer

A B S

ABS Light

Left -

“Road-Side”

"SAL"


"SL"

Installation Guidelines for the TABS-6 4S/3M Side/Axle ABS Con fi guration:


• MOD2 (BR9235

™


• MOD3 (BR9235

™


• SL & SR (Primary Sensors) senses wheels on the primary axle (always on the ground) that MOD1 controls, and are connected to the dedicated 2-pin connector on the TABS-6 ECU.

• SAL & SAR (Additional Sensors) senses the wheels that MOD3 controls, and are connected to the

18-pin connector on the TABS-6 ECU.

• For lift axle applications, MOD3 controls the wheels for the lift-able axle.

21

Troubleshooting Flowcharts

Diagnostic trouble code information can be retrieved from the TABS-6 module by using blink code diagnostics, or a diagnostic tool. The following troubleshooting fl ow charts will help the technician isolate the cause of the fault and con fi rm whether the fault resides in the component, wiring or connectors.

Troubleshooting should always begin by observing the dash or trailer-mounted ABS indicator lamp during the

TABS-6 module's power-up sequence. If it is necessary to make electrical measurements, always begin by taking voltage and resistance measurements at the 5- or 18-pin

ECU pigtail harness connector.

Once the circuit fault is found, isolate the area needing repair by repeating the measurements at all connections in the affected circuit towards the modulator, wheel speed sensor, etc.

No voltage or resistance measurements are to be made on the bulkhead connector pins of the module.

Troubleshooting Flowcharts

Section A : (Power-Up Sequence)

Trailer-Mounted ABS Indicator Lamp . . . . . . . Page 23

Section B: (Power-Up Sequence)

Dash-Mounted ABS Indicator Lamp . . . . . . . . Page 24

Section C:

Diagnostic Trouble Code (DTC) Blink

Code Quick Reference . . . . . . . . . . . . . . . . . . . Page 25

Section D:

Diagnostic Trouble Code

TRDU

™

Tool LED Quick Reference . . . . . . . . . Page 26

Section E:

Troubleshooting the Trailer-Mounted

ABS Indicator Lamp Circuitry . . . . . . . . . . . . . Page 27

Section F:

Troubleshooting the Power Supply . . . . . . . . . Page 28

Section G:

Troubleshooting the WS-24

™

Wheel

Speed Sensors . . . . . . . . . . . . . . . . . . . . . . . . . Page 29

Section H:

Troubleshooting the BR9235

™

Modulator

Relay Valves. . . . . . . . . . . . . . . . . . . . . . . . . . . Page 30

22

SECTION A: (POWER-UP SEQUENCE)

TRAILER-MOUNTED ABS INDICATOR LAMP

23

24

SECTION B: (POWER-UP SEQUENCE)

DASH-MOUNTED ABS INDICATOR LAMP

SECTION C: DIAGNOSTIC TROUBLE CODE (DTC)

BLINK CODE QUICK REFERENCE

1st Blink Code

Code Location

1 All

2 Sensor SL

3 Sensor SR

4 Sensor SAL

5 Sensor SAR

6 Power

7 Valve MOD1

8 Valve MOD2

9 Valve MOD3

10 Common

11 ECU

12 Diagnostics

13 Indicator Lamp

2nd Blink Code

Code Description

1 No Diagnostic Trouble Codes

1 Sensor signal valid - large air gap

2 Sensor signal valid - loss of signal

3 Sensor signal valid - noisy

4 Sensor shorted or open

5 Tire diameter out of range

6 Sensor confi guration error

1 Over-voltage

2 Low-voltage

3 Excessive power line resistance

1 Hold solenoid (AUX) shorted or open

2 Release solenoid (AUX) shorted or open

3 ABS modulator dynamic error

4 Valve confi guration error

1 Valve MOD1/2 low-side switch shorted to ground

2 Valve MOD3 (AUX) low-side switch shorted to ground

3 ABS modulator dynamic error - all valves

4 Excessive ABS activity

1 ECU internal error

2 ECU confi guration error

1 J1587 diagnostics (AUX6) shorted or open

1 ABS lamp (AUX7) shorted or open

• System fully operational - no faults detected

• Go to Section G - Dynamic WSS DTCs



• Go to Section G - Static WSS DTCs

• Verify correct tire size, proper tire infl ation & correct

number of exciter ring teeth. Verify that the ECU

has the proper tire size settings.

• Verify correct ABS confi guration. If needed, reset to

the default ABS confi guration and power-up to

initiate auto-confi guration.

• Go to Section F - Power Supply



• Go to Section H - ABS Modulator DTCs










• Check for damaged or corroded connectors. Check

for damaged wiring. After repairs or if no issues

found, then clear faults. If faults return, replace the

module.





between the ECU and J1587 Diagnostic (AUX6).

Replace/repair J1587 Diagnostic (AUX6) wiring or


• Go to Section E - Trailer ABS Indicator Lamp

To Read/Clear Diagnostic Troubleshooting Codes (DTCs):

1. Apply constant power to the trailer (ignition switch).

2. Within 15 seconds, apply/release the brake pedal at 1 second intervals:

(a) 3 times for displaying Active DTCs.

(b) 4 times for displaying Inactive DTCs.

(c) 5 times for clearing Active DTCs.

3. After 5 seconds delay, the blink codes will be displayed.

4. Observe the trailer-mounted ABS indicator lamp and record blink code(s).

5. Refer to blink code chart for description.

6. After making repairs and clearing Active DTCs, verify lamp is no longer illuminated.

25

SECTION D: DIAGNOSTIC TROUBLE CODE (DTC)

TRDU

™

TOOL LED QUICK REFERENCE

Power

System OK - A solid green VLT LED indicates proper voltage is reaching the module. If no red LEDs are on, then no DTC's are detected.

If the ABS indicator lamp is on with no red LEDs, Go To

Section E, page 27.

Voltage Out of Range - A flashing green VLT LED indicates ECU voltage below 8.0 VDC or above 16.0

VDC. The VLT LED will flash until power is brought into normal range. Go to Section F, page 28.

No Voltage - When the VLT LED is off, the module is receiving very low or no voltage, or there is no communication to TRDU. The ECU LED may be on in this case. Go to Section F, page 28.

Wheel Speed Sensor DTC

The red SEN LED is on to indicate a DTC with a wheel speed sensor. The example above shows the LEDs illuminated when there is an additional right sensor

(SAR) DTC.

Troubleshooting and repair are the same for a DTC on any wheel speed sensor. The indicated sensor DTC may be static or dynamic.

Static DTCs

are related to wiring or component failures such as open or short circuits.

Dynamic DTCs

are related to abnormal wheel speed signals or behaviors.

Go To Section G, page 29.

26

ABS Modulator DTC

The red M1, M2 and/or M3 LED is on to indicate a DTC with an ABS modulator. The example above shows the

LEDs illuminated when there is a DTC for a second ABS modulator (MOD2).

The indicated modulator DTC may be static or dynamic.

Static DTCs

are related to wiring or component failures such as open or short circuits.

Dynamic modulator DTCs

are related to abnormal wheel speed behaviors during ABS.

Go to Section H, page 30.

M1

ODO

Magnetic Reset -

All LEDs will be on while a magnet is held in place at the

RESET location near the “B” in Bendix.

When held for less than 6 seconds, the

DTCs are cleared. When held for more than 6 seconds,the ABS configuration is reset. If one or more LEDs do not illuminate, replace the TRDU

™

tool. Do not reset the

DTC codes until troubleshooting of the indicated component is complete.

ECU DTC

The red ECU LED is on to indicate a DTC internal to the

™

TABS-6 module. Reset the TRDU tool with a magnet. If the DTC returns, replace the module.

If the red ECU LED is on and the green VLT LED is off, the module may have very low voltage. In this case, go to Section F.

Odometer Mileage -

The TRDU will continously display the odometer information (x1000) by flashing the blue ODO LED. There will be a 20 second pause between ODO displays.

As an example: 152,431 miles will be displayed as:

152 (x1000) ... or 1 blink (pause), 5 blinks (pause), 2 blinks.

Zeros are displayed by the blue ODO

LED strobing twice.

SECTION E: TROUBLESHOOTING THE TRAILER-MOUNTED

ABS INDICATOR LAMP CIRCUITRY

Looking into Standard

TABS-6 Module Wire

Harness (Pin D ABS

Indicator Lamp)

Looking into Premium

TABS-6 Module Wire

Harness (Pin 5 ABS

Indicator Lamp)

27

SECTION F: TROUBLESHOOTING THE

POWER SUPPLY

Measure the loaded voltage across a type

1157 brake light bulb.

28

Looking into Premium TABS-6 Module Wire Harness,

ECU Connector Measure:

Pin 6 (Ignition Power) to Pin 18 (ground) and

Pin 12 (Brake Light Power) to Pin 18 (ground)

Looking into Standard TABS-6 Module Wire Harness,

ECU Connector Measure:

Pin B (Ignition Power) to Pin E (ground) and

Pin A (Brake Light Power) to Pin E (ground)

SECTION G: TROUBLESHOOTING THE

WS-24

™

WHEEL SPEED SENSORS (WSS)

Looking into Wire Harness(es)

SR Sensor

1 - Right (Curb) Sensor +

2 - Left (Curb) Sensor -

SL Sensor

1 - Left (Road) Sensor +

2 - Right (Road) Sensor -

Looking into Premium TABS-6 Module Wire Harness when Additional Wheel Speed Sensors are used:

SAR:

11 - Additional Right (Curb) Sensor +

17 - Additional Right (Curb) Sensor -

SAL:

8 - Additional Left (Road) Sensor +

14 - Additional Left (Road) Sensor -

29

SECTION H: TROUBLESHOOTING THE

MODULATOR RELAY VALVES

30

Premium TABS-6 Module Wire Harness for BR9235

™

Modulator Valve Connector

Looking into Modulator

Connector Pins:

Pin 1 (Release)

Pin 2 (Common)

Pin 3 (Hold)

(Optional)

Looking into ECU

Connector:

Pin 9 is MOD2 release

Pin 3 is MOD2 Common

Pin 15 is MOD2 Hold

Pin 10 is MOD3 release

Pin 4 is MOD3 Common

Pin 16 is MOD3 Hold

2-Pin Sensor Pin-Out and Routing Info

Date of Manufacture Code

5-Pin ECU Pin-Out

Bendix Part Number

Number Showing the Initial Software

Loaded

(Software may be revised on the production line or in the fi eld.)



2-Pin Sensor Pin-Out and Routing Info

18-Pin ECU Pin-Out

FIGURE 17 - LABEL INFORMATION

ECU Part Number Label

The external part number label is located on the relay valve portion of the module. Label shown above is located under the removable cover of the TABS-6 module. If the part number label is not readable or is painted over, the ECU part number and revision can be read using a diagnostic tool. The number of the initial software loaded on the ECU is also indicated.

The module part number, and pin-out information is shown on the label beneath the removable cover.

Software Revision Level

The current software revision number can be read using a diagnostic tool.

Document Revision Level

Please visit Bendix.com to ensure you have the latest version of this document.

31

32

BW2469 ©2010 Bendix Commercial Vehicle Systems LLC • All Rights Reserved • 7/10 • Printed in U.S.A. Printed on recycled paper

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