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Parking aid control unit J446
The function of the acoustic parking aid "APS" is identical to that of the predecessor model.
The Audi A3 ’04 is also fitted with a fourchannel system, which means that the parking aid is again only available at the rear bumper for the Audi A3 ’04.
Use is made of 4th generation sensors which have been optically modified and are identical in terms of design to those in the
Audi A8 ’03.
On account of the installation position, the sensors have different plug connections and
Audi genuine part numbers.
The internal design of the connectors is identical to offer a greater range of adaption options.
312_068
Input and output signals
The following CAN information is required by the parking aid control unit J446:
ESP control unit J104
Vehicle speed
Rear parking aid warning buzzer H15
Warning signal
Automatic gearbox control unit J217
Selector lever position
Data bus diagnostic interface J533
Onboard power supply control unit
J519
Reversing light on
Parking aid control unit J446
Trailer detector control unit J345
Trailer detected
312_094
Basic information can be found in Self Study Programme 194 (Audi A6) and Self Study
Programme 213 (New Technologies ‘99).
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Control Units
Advantages of the new sensors
– Less sensitive to dirt and water
– Larger horizontal sensing angle
– Mechanically encoded installation position
New function
The warning tone is output as of 160 cm.
A continuous tone starts to sound at 30 cm.
On vehicles with trailer coupling this range is
35 cm to allow for the ball attachment.
The side warning range starts at 60 cm.
The volume of the acoustic alarm is reduced if the distance from an obstacle does not change within four seconds.
In this situation, the distance warning given by the two outer sensors is already deactivated after three seconds to indicate that the vehicle is reversing alongside a wall and not approaching an obstacle.
The warning tone is muted if trailer connection is signalled by the trailer detector control unit J345.
The tone generator is located at the rear right of the vehicle above the wheel housing.
312_095
Self-diagnosis
Parking aid control unit J446 self-diagnosis can be selected by way of address word 76.
Parking aid control unit J446 diagnosis is implemented via the CAN and the data bus diagnostic interface J533. A K-wire is no longer provided.
Adaption
Adaption permits alteration of
– Volume
– Frequency or
– Acknowledgement tone
It is also possible to reset the factory setting.
Volume and frequency can now be adapted in nine stages instead of five.
Control unit encoding
Long 20-bit encoding must be performed using the diagnosis tester.
Changes to the code are adopted immediately without the need for an ignition off/on cycle.
Ambient conditions
Fault entries in the parking aid control unit
J446 are now also accompanied by an indication of the ambient conditions.
This is designed to assist fault-finding.
The standard ambient conditions are stored with mileage, date and time.
Vehicle self-diagnosis
Interrogating fault memory
Ambient conditions
00532002
Supply voltage
Lower limit value not reached
76 Parking aid
8P0919283
Parking aid 4-chan H06 0010
Code 1003
Dealership number 131071
Standard values 11100010 8 1 40 0002446 0 16.01.03 03:37:47
Jump Print Help
312_093
The ambient conditions are accessed by pressing the bottom right arrow key on the diagnosis tester display when viewing the fault memory content.
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Key Features
- Mobile phone installation with voice control
- Echo compensation and speed-dependent volume control
- Center loudspeaker for enhanced acoustics
- BOSE sound system with 6-channel actuation
- Advanced control unit networking
- Transportation mode for minimizing power consumption
- Selective convenience CAN sleep mode
- Master function for terminal 15 continued operation
- Load management for electrical system stability