My wife's Audi 2004 A3 2.0 FSI:
A while ago, the rear wiper stopped half way up the screen - Being familiar with VAG rear wiper motor problems, "no worries" I thought - the spindle is stuck. Cleaned, regreased, reassembles, it gets half way up the screen and then clatters as the teeth on the gear wheel have been damaged.
So a few months of not having a working wiper pass by, and I eventually get a replacement Valeo wiper motor. It appears to be dead on arrival, as there's nothing from it. Swapped for another new one and exactly the same.
So I suspect it must be a fault on the car.
The new motor works fine in my B5.5 VW Passat, so I get the multimeter out and look at the electrical connectors:
The plug has 4 pins: labelled on the motor as 15-WW-INT-31 (colours black/yellow; green/white; green/red; brown
31 is earth
with the ignition off, the other 3 are all 0 volt
ignition on, all 3 go to 11 volts (whether the motor is plugged in or unplugged)
On the VW,
pin 15 goes 12v with ignition on, and with the motor plugged in, pins WW & INT show 5 volts
when wash/wipe arm is pushed, WW goes to 12v.
So, it seems that something on the A3 isn't controlling the motor as expected.
I can't find a wiring diagram to trace what controls the wiper function.
I've checked the fuses 41&42 which are fine.
Are there any relays controlling the WW/intermittent wipe?
Any other advice about what might be wrong?
A while ago, the rear wiper stopped half way up the screen - Being familiar with VAG rear wiper motor problems, "no worries" I thought - the spindle is stuck. Cleaned, regreased, reassembles, it gets half way up the screen and then clatters as the teeth on the gear wheel have been damaged.
So a few months of not having a working wiper pass by, and I eventually get a replacement Valeo wiper motor. It appears to be dead on arrival, as there's nothing from it. Swapped for another new one and exactly the same.
So I suspect it must be a fault on the car.
The new motor works fine in my B5.5 VW Passat, so I get the multimeter out and look at the electrical connectors:
The plug has 4 pins: labelled on the motor as 15-WW-INT-31 (colours black/yellow; green/white; green/red; brown
31 is earth
with the ignition off, the other 3 are all 0 volt
ignition on, all 3 go to 11 volts (whether the motor is plugged in or unplugged)
On the VW,
pin 15 goes 12v with ignition on, and with the motor plugged in, pins WW & INT show 5 volts
when wash/wipe arm is pushed, WW goes to 12v.
So, it seems that something on the A3 isn't controlling the motor as expected.
I can't find a wiring diagram to trace what controls the wiper function.
I've checked the fuses 41&42 which are fine.
Are there any relays controlling the WW/intermittent wipe?
Any other advice about what might be wrong?
