42
The Electrics
The Passat 2001 with BI-xenon headlights has automatic headlight range control.
The task of the automatic headlight range control
is to adjust the headlights to compensate for
variation in ride height as a function of payload.
The automatic headlight range control also
compensates for variation in headlight range
caused by dynamic effects under braking and
acceleration, for example.
The headlight range control system comprises:
Headlight range control, control unit J431
receives signals from two level sensors (one on
the front axle and one on the rear axle) and the
road speed signal. Having evaluated the signals,
the system activates the control motors in the
headlights and thereby compensates for
variation in vehicle level.
The headlight control motors are configured as
stepping motors. They can perform the full range
of headlight adjustments within approximately 1
second.
The control unit has self-diagnostic capability
and can be addressed with address word 55.
Task
Automatic dynamic headlight range control (LWR)
Function:
Road speed signal
Self-diagnosis
Vehicle "level"
senders
G76
and G78
stepping motor, right
V49
stepping motor, left
V48
Headlight range control,
control unit J431
in the luggage
compartment, left
Termi nal 15
Termi nal 31
Terminal 56
Input signal
Output signal Earth
+
251_004
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