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Thread: Wiper issue - Not parking at all?

  1. #1
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    Wiper issue - Not parking at all?

    Hey all,

    I've done some searching and seen *similar* issues (like wipers parking straight up when shut off) but haven't seen this particular issue before:

    Wipers work completely fine all the time, except when shut off they simply stay wherever they were when lever is disengaged. I haven't really messed with it yet but was just curious if this is something anyone has encountered before

  2. #2
    Join Date
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    seattle
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    1990 325i sedan M20 glac
    Use a socket wrench to remove the nut located at the center of the wiper motor. This nut connects the arm linkage to the motor. Turn the wipers on, then back off, so the motor completes a full cycle and returns to the correct park position. The blades will not move since the linkage has been disconnected.

    ripped from the internet. seems logical.

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  3. #3
    Join Date
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    11/88 E32 750iL+98 E36M3
    we had that once on an E32, there is a parking position switch on the wiper motor of the E32. If that contacts to ground, it continues wiping, maybe a cable is damaged and touches the chassis? The wiper switch is actuated by ground contact, also check around the steering wheel if there is a wire damaged and touches ground.
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  4. #4
    richardodn's Avatar
    richardodn is offline Old Guy BMW CCA Member
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    A bit more on what shogun said. To follow along, get the ETM from http://wedophones.com/BMWManualsLead.htm and go to diagram 6160-0.

    Wipers are actually controlled by the K10 wiper control unit located in the fuse box. The switch shogun mentions is an internal switch in the motor that tracks the position of the wipers. When the wipers are parked the switch is open (parked). As soon as the wipers start moving the switch closes (run). This cycles every full sweep of the wipers. When you turn on the wipers, the control unit receives ground on one of the on inputs which in turn flips a relay switch to send power to the wiper motor. Now when you turn off the wipers, you want to let them keep moving until it's back in park. That's the reason for the internal switch. It keeps supplying an 'on' input to the controller until the motor returns to park. Then the switch is opened, 'on' input ends, and the wipers are parked. Since your wipers stop immediately when you switch them off, that shows the control unit isn't getting the 'on' input from the motor. There are 2 reasons for that. Most likely is the motor's internal switch. That likely means motor replacement. The second possibility is a wiring fault. To diagnose, start the wipers and then turn them off with the wipers not parked. At the motor, check for ground at the black/red wire connection. If you have ground, the wiring is bad. If not, the motor is bad.
    "Howdy, Folks!"

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  5. #5
    richardodn's Avatar
    richardodn is offline Old Guy BMW CCA Member
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    "Howdy, Folks!"

    1986 Delphin 528e - Has led a hard life, 290k and still alive.
    1989 Zinnoberrot 325iX Sedan - My winter snowmobile. (Deceased)
    1998 Avus Blau 328iC - My topless summer girl.
    1999 Audi A4 Avant Quattro - Crap can, but I'm in too deep.
    2012 X3 xDrive35i - My new snowmobile.

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