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Home >> Buick >> 2013 >> Encore Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 101 (Wiper System And Washer System) >> Diagnostic Information and Procedures >> Windshield Wiper System Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2016 Chevrolet Trax and 2016 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

Windshield Wiper/Washer Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify the scan tool Windshield Wiper High Speed Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal 1 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
  6. Verify the scan tool Windshield Wiper High Speed Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, remove the jumper wire, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If Active 
  7. Test for greater than 8 V between the signal circuit terminal 3 and ground.
    • If less than 8 V 
    1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit and ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If 8 V or greater 
  8. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
  9. Test for less than 1 V between the S82 Windshield Wiper/Washer Switch signal circuit terminal 3 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  10. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Wiper Motor Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M75 Windshield Wiper Motor. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify the scan tool Windshield Wiper Park Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the M75 Windshield Wiper Motor signal circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground.
  6. Verify the scan tool Windshield Wiper Park Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, remove the jumper wire, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If Active 
  7. Connect a test lamp between the following control circuits and ground, ignition ON.
    • Control Circuit Terminal 4
    • Control Circuit Terminal 5
  8. Verify the test lamp does NOT turn ON and OFF when commanding the appropriate Windshield Wiper Relay On and Off with a scan tool.
    • If the test lamp turns ON and OFF for both terminals 

      Test or replace the M75 Windshield Wiper Motor.

    • If the test lamp does not turn ON and OFF for one or both terminals 
  9. Ignition OFF and all vehicle systems OFF, connect the harness connector at the M75 Windshield Wiper Motor. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood. It may take up to 2 min for all vehicle systems to power down.
  10. Test for less than 10 Ω between the ground circuit terminals listed below and ground:
    • Terminal C5
    • Terminal H1
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  11. Ignition ON.
  12. Verify the M75 Windshield Wiper Motor is not activated.
    • If the M75 Windshield Wiper Motor is activated 
    1. Ignition OFF, disconnect the harness connector at the M75 Windshield Wiper Motor, ignition ON.
    2. Test for less than 1 V between each control circuit listed below and ground:
      • Terminal 4
      • Terminal 5
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the M75 Windshield Wiper Motor.
    • If the M75 Windshield Wiper Motor is not activated 
  13. Connect a 20 A fused jumper wire between the control circuit terminals listed below, one at a time, and B+.
    • Terminal H2
    • Terminal C1
  14. Verify the M75 Windshield Wiper Motor activates.
    • If the M75 Windshield Wiper Motor does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the M75 Windshield Wiper Motor.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than Infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the M75 Windshield Wiper Motor.
    • If the M75 Windshield Wiper Motor activates 
  15. Ignition OFF, connect the X2 harness connector at the X50A Fuse Block - Underhood. Disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
  16. Verify the M75 Windshield Wiper Motor low speed is not activated.
    • If the M75 Windshield Wiper Motor low speed is activated 
    1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
    2. Test for less than 1 V between the control circuit terminal D3 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the X50A Fuse Block - Underhood.
    • If the M75 Windshield Wiper Motor low speed is not activated 
  17. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  18. Verify the M75 Windshield Wiper Motor High Speed is not activated.
    • If the M75 Windshield Wiper Motor high speed is activated 
    1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
    2. Test for infinite resistance between the control circuit terminal D2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the X50A Fuse Block - Underhood.
    • If the M75 Windshield Wiper Motor high speed is not activated 
  19. Connect a 10 A fused jumper wire between the control circuit terminal 16 X4 and B+.
  20. Verify the M75 Windshield Wiper Motor activates.
    • If the M75 Windshield Wiper Motor does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If less than infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the X50A Fuse Block - Underhood.
    • If the M75 Windshield Wiper Motor activates 
  21. Connect a 10 A fused jumper wire between the control circuit terminal 24 X5 and ground.
  22. Verify the M75 Windshield Wiper Motor activates.
    • If the M75 Windshield Wiper Motor does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to ground on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the X50A Fuse Block - Underhood.
    • If the M75 Windshield Wiper Motor activates 
  23. Replace the K9 Body Control Module.
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