SRS Airbag - Operation

RS–2
SUPPLEMENTAL RESTRAINT SYSTEM
–
SRS AIRBAG
RS0O3–01
OPERATION
1.
STEERING WHEEL PAD (with AIRBAG)
The inflater and bag of the SRS are stored in the steering wheel
pad and cannot be disassembled. The inflater contains a squib,
igniter charge, gas generator, etc., and inflates the bag when
instructed by the airbag sensor assembly.
H12063
2.
SPIRAL CABLE (in COMBINATION SWITCH)
A spiral cable is used as an electrical joint from the vehicle body
side to the steering wheel.
Spiral Cable
R09725
3.
FRONT PASSENGER AIRBAG ASSEMBLY
The inflater and bag of the SRS are stored in the front passenger airbag assembly and cannot be disassembled. The inflater
contains a squib, igniter charge, gas generator, etc., and inflates the bag when instructed by the airbag sensor assembly.
H12064
4.
SEAT BELT PRETENSIONER
The seat belt pretensioner system is a component of the front
seat outer belt. The pretensioner contains a squib, gas generator, wire, piston, etc., and operates in the event of a frontal collision. The seat belt pretensioner cannot be disassembled.
H13911
5.
SRS WARNING LIGHT
The SRS warning light is located on the combination meter. It
goes on to alert the driver of trouble in the system when a malfunction is detected in the airbag sensor assembly self–diagnosis. In normal operation conditions when the ignition switch is
turned to the ON position, the light goes on for about 6 seconds
and then goes off.
H12062
2000 MR2 (RM760U)
AuthorĂ:
DateĂ:
1042
RS–3
SUPPLEMENTAL RESTRAINT SYSTEM
H13945
–
SRS AIRBAG
6.
AIRBAG SENSOR ASSEMBLY
The airbag sensor assembly is mounted on the floor inside the
lower center finish panel. The airbag sensor assembly consists
of an airbag sensor, safing sensor, diagnosis circuit, ignition
control, drive circuit, etc. It receives signals from the airbag sensor, front airbag sensor, side airbag sensor assembly and door
side airbag assembly and judges whether the SRS must be activated or not. The airbag sensor assembly cannot be disassembled.
7.
FRONT AIRBAG SENSOR
The front airbag sensor is mounted inside each of the side
members. The sensor unit is a mechanical type. When the sensor detects deceleration force above a predetermined limit,
contact is made in the sensor, sending a signal to the airbag
sensor assembly. The front airbag sensor cannot be disassembled.
H12065
Indicator Light
Passenger Airbag
Manual On–Off Switch
8.
PASSENGER AIRBAG MANUAL ON–OFF SWITCH
Passenger airbag manual on–off switch is mounted on in the
glove compartment door. By turning the passenger airbag
manual on–off switch to OFF with the ignition key, the passenger airbag system can be disabled. Also, in order to notify the
passenger that the passenger airbag is disabled, OFF indicator
inside the switch will light up.
Switch Position
Passenger Airbag
Indicator Light
ON
Operative
OFF
OFF
Disabled
ON
H13952
2000 MR2 (RM760U)
AuthorĂ:
DateĂ:
1043
RS–4
SUPPLEMENTAL RESTRAINT SYSTEM
–
SRS AIRBAG
9.
SRS CONNECTORS
HINT:
SRS connectors are located as shown in the following illustration.
7
8
Seat Belt
Pretensioner (RH)
9
Front Airbag Sensor (RH)
Passenger Airbag
Manual On–Off Switch
6
2
Airbag Sensor
Assembly
13
Front Passenger Airbag
Assembly (Squib)
1
3
4
Spiral Cable
5
10
Steering Wheel
Pad (Squib)
11
Front Airbag Sensor (LH)
12
Seat Belt
Pretensioner (LH)
H12061
No.
Item
Application
(1)
Terminal Twin–Lock Mechanism
Connectors 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,13
(2)
Airbag Activation Prevention Mechanism
Connectors 1, 2, 3, 4, 5, 6, 13
(3)
Electrical Connection Check Mechanism
Connectors 1, 2, 3
2000 MR2 (RM760U)
AuthorĂ:
DateĂ:
1044
RS–5
SUPPLEMENTAL RESTRAINT SYSTEM
(a)
–
All connectors in the SRS are colored in yellow to distinguish them from other connectors. Connectors having
special functions and specifically designed for the SRS
are used in the locations shown on the previous page to
ensure high reliability. These connectors use durable
gold–plated terminals.
(1)
Spacer
Housing
(2)
Female
Male
Z05953
SRS AIRBAG
Terminal Twin–Lock Mechanism
Each connector has a two–piece component consisting of a housing and a spacer. This design enables the terminal to be locked securely by two locking devices (the retainer and the lance) to prevent
terminals from coming out.
Airbag Activation Prevention Mechanism
Each connector contains a short spring plate. When
the connector is disconnected, the short spring
plate automatically connects positive (+) terminal
and negative (–) terminal of the squib.
When Connector is Connected
When Connector is Disconnected
Short Spring Plate
Short Spring Plate
Contacting Male Terminal
Housing
Housing
Short Spring Plate ON
Terminal
Squib
Connectors
Squib
Short Spring Plate
Closed Circuit
R10587
2000 MR2 (RM760U)
AuthorĂ:
DateĂ:
1045
RS–6
SUPPLEMENTAL RESTRAINT SYSTEM
–
SRS AIRBAG
HINT:
The type of connector is shown in the diagram on the previous
page.
(3)
SRS
Warning
Light
Disconnection
Detection
Pin
Airbag Sensor Assembly
Electrical Connection Check Mechanism
This mechanism electrically checks that connectors
are connected correctly and completely. The electrical connection check mechanism is designed so
that the disconnection detection pin connects with
the diagnosis terminals when the connector housing lock is locked.
R12076
FHalf Connection
FComplete Connection
Terminal for
Diagnosis
Terminal for Diagnosis
Disconnection Detection Pin
H01315
HINT:
The illustration shows connectors ”1”, ”2” and ”3” in step 11.
2000 MR2 (RM760U)
AuthorĂ:
DateĂ:
1046
RS–7
SUPPLEMENTAL RESTRAINT SYSTEM
When the vehicle is involved in a frontal collision in the
hatched area (Fig. 1) and the shock is larger than the predetermined level, the SRS is activated automatically. A
safing sensor is designed to go on at a smaller deceleration rate than the airbag sensor. As illustrated in Fig. 2,
ignition is caused when current flows to the squib, which
happens when a safing sensor and the deceleration sensor go on simultaneously. When a deceleration force acts
on the sensors, 2 squibs in the driver airbag and front passenger airbag ignite and generate gas. The gas discharging into the driver airbag and front passenger airbag rapidly increases the pressure inside the bags, breaking
open the steering wheel pad and instrument panel.
Bag inflation then ends, and the bags deflate as the gas
is discharged through discharge holes at the bag’s rear or
side.
10.
DISCONNECTION OF CONNECTORS FOR FRONT
AIRBAG SENSOR
While holding both flank sides of the outer, slide the outer
to the direction shown by an arrow.
Lock of the connectors is released, then disconnect the
connectors.
Power Source
Fig.2
SRS AIRBAG
(b)
Fig.1
Safing
Sensor
–
Squibs
Deceleration Sensor
Z14034
Outer
(a)
(b)
H01581
HINT:
Be sure to hold both flank sides of the outer. If holding the top
and bottom sides, it will obstruct disconnection.
Lock of connector is released
Disconnection is completed
H01582
2000 MR2 (RM760U)
AuthorĂ:
DateĂ:
1047
RS–8
SUPPLEMENTAL RESTRAINT SYSTEM
11.
–
SRS AIRBAG
CONNECTION OF CONNECTORS FOR FRONT AIRBAG SENSOR
Outer
Outer
H01583
(a)
Align the male connector (of the side of sensor) and female connector in the same direction as shown in the illustration and fit in them without rubbing.
(b) As they are fitted in, the outer slides rearward. Press it until the outer returns to its original position again.
If fitting stops half way, connectors will separate.
(c) Be sure to insert until they are locked. After fitting in, pull
them slightly to check that they are locked (When locked,
make sure that the outer returns to its original position and
the click can be heard at the time of fitting in.).
HINT:
S
Do not fit in while holding the outer.
S
When fitting in, the outer slides. Do not touch it.
2000 MR2 (RM760U)
AuthorĂ:
DateĂ:
1048
RS–9
SUPPLEMENTAL RESTRAINT SYSTEM
12.
(a)
(b)
(c)
Slider
–
SRS AIRBAG
DISCONNECTION OF CONNECTORS FOR STEERING
WHEEL PAD (with AIRBAG) AND FRONT PASSENGER AIRBAG ASSEMBLY
Place a finger on the slider.
Slide the slider to release lock.
Disconnect the connector.
Slider
Disconnection is completed
H01586
2000 MR2 (RM760U)
AuthorĂ:
DateĂ:
1049
RS–10
SUPPLEMENTAL RESTRAINT SYSTEM
13.
(a)
(b)
–
SRS AIRBAG
CONNECTION OF CONNECTORS FOR STEERING
WHEEL PAD (with AIRBAG) AND FRONT PASSENGER AIRBAG ASSEMBLY
Align a lock part of male connector and a slider of female
connector in the same direction as shown in the illustration, fit in them without rubbing.
Be sure to insert until they are locked. After fitting in pull
them slightly to check that they are locked (When locked,
make sure that the outer returns to its original position and
the click can be heard at the time of fitting in.).
HINT:
S
S
Slider
As the slider slides, do not touch it.
Be careful not to deform the release board. If the release
board is deformed, replace it with a new one.
Slider
H01587
2000 MR2 (RM760U)
AuthorĂ:
DateĂ:
1050