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Wipers come on when ignition switch is turned on

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My guess would be that either your wiper relay contact is stuck on the close position or your wiper switch is stuck on the on position.

Posted on Dec 04, 2012

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Why is it my 2008 chevy uplander rear wiper motor/blade moves some and stops. I let van set 5-10 minutes with key off. Turn on key. Wiper motor/blade moves a few degrees and then stops again. Why?


Can you move the wiper by hand ? Which does your vehicle have ?
WDA/Z88 The rear wiper is controlled based on an input from the rear wiper/washer portion of the multifunction switch. When closed, the wiper ON and wiper DELAY switches provide a unique voltage signal to the rear window wiper motor indicating the desired speed. Each switch has a unique resistor that drops the voltage to a specified value which is interpreted by the rear window wiper motor as ON or DELAY. The rear wiper motor receives B+ voltage from the I/P fuse block and accessory voltage from the body control module (BCM).
W49 The rear wiper is controlled based on an input from the rear wiper/washer switch. When closed, the wiper ON switch provides a voltage signal to the rear window wiper motor indicating rear wiper operation is requested. The rear wiper motor receives B+ voltage from the I/P fuse block and accessory voltage from the body control module (BCM).
Do you know how to do electrical testing ?
WDA/Z88
  1. Ignition OFF, disconnect the harness connector X1 at the multifunction switch.
  2. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 4 and ground.
  3. ?‡'
    If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to Power Mode Mismatch.

  4. Ignition OFF, connect the harness connector at the multifunction switch. Disconnect the harness connector at the rear window wiper motor.
  5. Test for less than 20 ohms between the ground circuit terminal B and ground.
  6. ?‡'
    If greater than the specified range, test the ground circuit for an open/high resistance.

  7. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal A and ground.
  8. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.

  9. Verify a test lamp illuminates between the ignition circuit terminal E and ground.
  10. ?‡'
    If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

  11. Rear wiper switch in the ON position, test for B+ between the signal circuit terminal D and ground.
  12. ?‡'
    If less than the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, test or replace the multifunction switch.

  13. Rear wiper switch in the DELAY position, test for B+ between the signal circuit terminal D and ground.
  14. ?‡'
    If less than the specified value, test or replace the multifunction switch.

  15. If all circuits test normal, test or replace the rear window wiper motor.
W49
  1. Ignition OFF, disconnect the harness connector at the rear wiper switch.
  2. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 6 and ground.
  3. ?‡'
    If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to Power Mode Mismatch.

  4. Ignition OFF, connect the harness connector at the rear wiper switch. Disconnect the harness connector at the rear window wiper motor.
  5. Test for less than 20 ohms between the ground circuit terminal B and ground.
  6. ?‡'
    If greater than the specified range, test the ground circuit for an open/high resistance.

  7. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal A and ground.
  8. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.

  9. Verify a test lamp illuminates between the ignition circuit terminal E and ground.
  10. ?‡'
    If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

  11. Rear wiper switch in the ON position, verify a test lamp illuminates between the signal circuit terminal D and ground.
  12. ?‡'
    If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the I/P switch assembly.

  13. If all circuits test normal, test or replace the rear window wiper motor.
Component Testing

Do you know how

Jun 09, 2016 | 2008 Chevrolet Chevrolet Uplander LS

1 Answer

1993 corvette wipers will come on by the wiper switch but must be turned off by ignition switch


Since the ignition switch has to kill the power to the wipers. Replace the wiper switch. Carbon build up inside the switch is why it won't turn off. You could take the wiper switch apart and clean up the tabs with sandpaper. Beware of springs though..

Oct 11, 2014 | 1993 Chevrolet Corvette

1 Answer

92 olds 88 blows wiper fuse with switch off and ignition is turned on . Switch is new.


It is getting power from somewhere. Obviously the correct wires havent all been disconnected. Sometimes they are mislabeled.

Mar 14, 2014 | Cars & Trucks

1 Answer

Locate fuse


That sounds like your ignition switch is bad. It should not only shut the engine off when ignition is turned to off, but when on, the ignition switch should also power up the circuits for the windows, wipers, and dash lights. Replace the ignition switch and it should all work right again.

Dec 31, 2013 | Cars & Trucks

1 Answer

How To Install Replace Windshield Wiper motor on a Honda Odyssey


Put the right side wiper on only. Turn on wipers. When the wiper moves all the way to the left and starts to go back to the right turn off the ignition with the wiper switch still on. Remove the right wiper arm and install the left wiper arm in the far left of the wiper movement. Turn on ignition and allow the left wiper to go all the way back to it's rest location at the bottom of the windshield. Turn off ignition and install the right side wiper arm. This will give you a start to properly set the wiper arms.

Apr 12, 2012 | 2003 Honda Odyssey

1 Answer

EF Ford Fairmont 1996, accessories stop when ignition switched to start


Eg wipers work while ignition switched to 'accessories' but stop when key turned to 'start'

I had this issue and took me ages and ages of wire tracing and probing. Your fuse box should have the wiper/windows accessories fuses. If you probe them and they aren't showing voltage, check wiring harness, check wiper motor voltage. My ignition barrel was the fault of all this, everything worked when switched to "accessories", but while the engine was running, the accessories turned off. The bottom of the ignition barrel pushed out, as the factory stopper groove bent out. All I did was cold chisel a dent back into the case. BAM fixed my windows/starting/wipers all in one go.

Nov 16, 2011 | Cars & Trucks

1 Answer

The wiper won't turn off at the switch but will turn off when the ignition key is turn off


Bad wiper switch or bad parking mecanism in the wiper motor asm. Switch is most likely. You can pull the wiper fuse so you can drive the car until it's repaired.

Feb 05, 2010 | 2000 Acura TL

1 Answer

Windshield washer doesn't work. I'm looking for the location of motor


Service and Repair
  1. Turn ignition switch to the ACCY position, then set wiper switch to the "PULSE position.
  2. Turn ignition switch off when wiper arms are at bottom and not moving.
  3. Lift wiper blade assembly up from windshield.
  4. Pull out retaining latch with a screwdriver.
  5. Pull wiper arm assembly off transmission driveshaft.
  6. Disconnect battery ground cable.
  7. Disconnect hose from washer hose.
  8. Remove five air inlet panel retainers.
  9. Push washer hose into firewall.
  10. Remove air inlet panel from vehicle.
  11. Using wiper transmission separator tool No. J-39232, or equivalent, remove transmission drive link socket from wiper motor crank arm.
  12. Pull two harness connector retainers out of wiper motor connector.
  13. Disconnect two harness connectors from wiper motor.
  14. Remove wiper motor attaching bolts and stud, then the wiper motor from the vehicle.
  15. Reverse procedure to install.

Dec 10, 2008 | 1995 Oldsmobile Aurora

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