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1989 BMW 535i wiper motor

Tiny
BIMMERTECH3
  • MEMBER
  • 1989 BMW 535I
  • 6 CYL
  • 2WD
  • MANUAL
  • 220,000 MILES
The wiper motor in my 535i runs all the time. I have replaced the relay, general module, relay module, the motor itself, the switch, and I have tested the wires for shorts and opens. Any other ideas? The positive wire for the slow setting (blk/rd/yellow) is the one that has power all the time, but the input wire from the switch (blk/blu) is not grounded, so the switch is not telling it to stay on. Any help would be appreciated
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Wednesday, February 4th, 2009 AT 11:06 AM

3 Replies

Tiny
DAVE H
  • MECHANIC
  • 13,384 POSTS
Hello ..thanks for the donation ... much apreciated

Hope this helps .. let me know

DESCRIPTION & OPERATION
All models have 2-speed wiper systems with an intermittent feature. Wiper control lever is located on right side of steering column.
TESTING
Disconnect wiper motor connector at motor. Check for battery voltage at No. 15 (Violet/Black wire) on wiper control relay. Move wiper switch lever to lower position. Voltage should be present at Black/White wire at wiper motor.
If voltage is present and motor is properly grounded, wiper motor should operate. If not, check fuse No. 5 (No. 11 on 525i and 535i) and wiring (Violet/Black) if no voltage is present.
Function control of solid state wiper control unit is by ground circuit completion at wiper/washer switch. Refer to WIRING DIAGRAMS section for appropriate circuit diagram.


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Wednesday, February 4th, 2009 AT 7:27 PM
Tiny
BIMMERTECH3
  • MEMBER
  • 2 POSTS
Thank you very much for the response. I am a bmw technician, I have all the wiring diagrams for this vehicle. What I have here is a strange problem and I was hoping someone has seen it before.
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Thursday, February 5th, 2009 AT 10:20 AM
Tiny
DAVE H
  • MECHANIC
  • 13,384 POSTS
Sorry not seen before. It is strange. But it must be getting a ground from somewhere?
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Tuesday, February 10th, 2009 AT 6:30 PM

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