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One level sender each at the front and rear axle signals the compression of the vehicle suspension. In addition,
a signal proportional to vehicle speed is processed by the ABS control unit.
The control unit evaluates these signals and actuates the headlight range controller when the lights are on.
The headlight range control system consists of the following:
◆ Headlight range control unit -J431
◆ Rear left vehicle level sender -G76
◆ Front left vehicle level sender -G78
◆ Headlight range control motor, left -V48
◆ Headlight range control motor, right -V49
Note:
If faults occur in the system, the driver is informed accordingly by a warning symbol in the dash panel insert
centre display.
9.3 - Starting automatic headlight range control self-diagnosis
Requirements:
• Vehicle diagnostic, testing and information system VAS 5051 connected up and vehicle self-diagnosis se‐
lected => Page 1
• Ignition on
Attention:
Heed safety precautions => Page 1 .
Sequence of operations
-> Display on VAS 5051:
- From list -1- select vehicle system "55 - Headlight range control".
- Wait until next display appears.
Audi A3 1997 ➤
Electrical system Self-diagnosis - Edition 02.2002
9.2 - General information 225
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