Rear wiper not working?

Tiny
REMIGIO47
  • MEMBER
  • 2005 AUDI A3
  • 1.6L
  • 4 CYL
  • 2WD
  • MANUAL
  • 100,000 MILES
Bought a new rear wiper motor but the new one doesn't seem to work either.
Checked voltage on connector and out of 4 pins I have 3 hot and one min all showing 14volt. But when I use the switch, the voltage doesn't disappear, nor does it change on any on the pins. If I remove the fuse, voltage only disappears on 1 pin which is the on supply. What could be the problem? And if I have constant voltage why does the motor, especially the new one, doesn't work?
Saturday, March 1st, 2025 AT 1:36 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,271 POSTS
The wiper is run through the vehicle electrical system control module, which is run by 5 fuses. here is a guide to help you test the fuses and the rear wiper wiring diagram so you can see how the system works and which fuses to check.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the images (below). Let us know how it goes.
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Sunday, March 2nd, 2025 AT 10:36 AM
Tiny
REMIGIO47
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Hi Ken, thanks for your reply. Not sure if you know that I have 14 volts on 3 of my 4 pins but the new and old motor still won't work. Do you think that the new motor could also be defect? When I turn the switch off, there is still 14 volts. Only when I remove the fuse left of the steering wheel one pin loses its 14 volt and that is the power pin, and not the speed pins from the connector. It's my rear wiper I am busy with.
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Monday, March 3rd, 2025 AT 11:18 AM
Tiny
KEN L
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The blk/yel wire will have 12 volts, (14 volts while the engine is running), the motor is controlled through the "vehicle electrical system control module" I would check the main ground at the motor which is the brn wire, please unplug the wiring connector before testing, here is a guide to help:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Connect the lead to power to check for ground. Let me know :)
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Tuesday, March 4th, 2025 AT 10:03 AM

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