Volkswagen The Golf 2004 Service Training page 30

Onboard power supply
The windscreen wiper system
Wiper actuation
The wiper system comprises of a single motor with mechanical connection between the wiper arms.
The switch positions of wiper switch E are sent directly to the steering column electronics control unit J527
and then via the convenience CAN data bus to the onboard supply control unit J519.
The onboard supply control unit passes on information about the selected wiper stage via the LIN data
bus to the wiper motor control unit J400, which is responsible for control of the wiper action.
On vehicles with rain and light detector sensor, the wiper frequency is calculated in rain sensor mode
and sent to the wiper motor control unit.
In intermittent operation, the wiper intermittent stages are speed dependent and vary between
2 and 24 seconds.
The wiper control system detects a blockage in the wiper motion and reacts according to the degree of
resistance. The wipers will try to move the obstacle out of the way. If it has still not been moved after the
fifth attempt, the wiper will stay in this position.
Activation of the wiper after the obstacle has been removed is possible only by actuation of the
windscreen wiper switch again.
Instead of a 360 degree rotation,
the drive housing of the wiper
performs a reversing action through
an angle of 150 degrees.
In this way, the amount of space
required for the wiper linkage has
been reduced.
30
S319_069