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Home >> Chevrolet >> 2021 >> Traverse Premier, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 49 (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 2020 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Windshield Wiper Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the connector at the S82 Windshield Wiper/Washer Switch.
  2. Verify a test lamp illuminates between the low reference circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Test circuit 6009 for an open/high resistance.
      • If open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If open/high resistance is not found
    2. Replace the K9 Body Control Module
    • Go to next step: If the test lamp illuminates 
  3. Ignition ON.
  4. Verify the scan tool Windshield Wiper Switch parameter is not High.
    • If High 
    1. Test circuit 1715 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the S82 Windshield Wiper/Washer Switch.
    • Go to next step: If not High 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1.
  6. Verify the scan tool Windshield Wiper Switch parameter is High.
    • If not High 
    1. Test circuit 1715 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found
    2. Test circuit 1715 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the K219 Lighting Control Module.
    • Go to next step: If High 
  7. Test for 4.8 - 5.2 V between the signal circuit terminal 3 and ground.
    • If less than 4.8 V 
    1. Test circuit 1714 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Test circuit 1714 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the K9 Body Control Module.
    • If greater than 5.2 V 
    1. Test circuit 1714 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If 4.8 - 5.2 V 
  8. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Wiper Motor Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 connector at the X50A Fuse Block - Underhood.
  2. Verify a test lamp illuminates between ground circuit terminal A2 and B+.
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 750 or ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Connect the X1 connector at the X50A Fuse Block - Underhood, disconnect the connector at the M75 Windshield Wiper Motor.
  4. Test for less than 10 Ω between the ground circuit terminal 5 and ground.
    • If 10 Ω or greater 

      Repair the open/high resistance on circuit 750 or ground connection.

    • Go to next step: If less than 10 Ω 
  5. Ignition ON.
  6. Verify the scan tool Windshield Wiper Mode parameter is not Parked.
    • If Parked 
    1. Test circuit 196 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the K219 Lighting Control Module.
    • Go to next step: If not Parked 
  7. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground circuit terminal 5.
  8. Verify the scan tool Windshield Wiper Mode parameter is Parked.
    • If not Parked 
    1. Test circuit 196 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Test circuit 196 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the K219 Lighting Control Module.
    • Go to next step: If Parked 
  9. Connect a test lamp between the following control circuits and ground, ignition ON.
    • Windshield Wiper Motor Low Speed Control Circuit Terminal 1
    • Windshield Wiper Motor High Speed Control Circuit Terminal 4
  10. Verify the test lamp does NOT turn ON and OFF when commanding the Windshield Wiper High and Low with a scan tool.
    • If the test lamp turns ON and OFF for both terminals 

      Test or replace the M75 Windshield Wiper Motor.

    • Go to next step: If the test lamp does not turn ON and OFF for one or both terminals 
  11. Ignition OFF, connect the harness connector at the M75 Windshield Wiper Motor. Disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
  12. Connect a 20 A fused jumper wire between the control circuit terminals listed below, one at a time, and B+.
    • Terminal B5
    • Terminal B6
  13. Verify the M75 Windshield Wiper Motor activates.
    • If the M75 Windshield Wiper Motor does not activate 
    1. Test the following circuits for a short to ground:
      • Circuit 92
      • Circuit 95
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Test the following circuits for an open/high resistance:
      • Circuit 92
      • Circuit 95
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the M75 Windshield Wiper Motor.
    • Go to next step: If the M75 Windshield Wiper Motor activates 
  14. Ignition OFF, connect the X1 connector at the X50A Fuse Block - Underhood. Disconnect the X2 connector at the K219 Lighting Control Module, ignition ON.
  15. Verify the M75 Windshield Wiper Motor low speed is not activated.
    • If the M75 Windshield Wiper Motor low speed is activated 
    1. Test circuit 91 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the X50A Fuse Block - Underhood.
    • Go to next step: If the M75 Windshield Wiper Motor low speed is not activated 
  16. Verify the M75 Windshield Wiper Motor High Speed is not activated.
    • If the M75 Windshield Wiper Motor high speed is activated 
    1. Test circuit 860 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the X50A Fuse Block - Underhood.
    • Go to next step: If the M75 Windshield Wiper Motor high speed is not activated 
  17. Connect a 10 A fused jumper wire between the control circuit terminal 12 X2 and B+.
  18. Verify the M75 Windshield Wiper Motor activates.
    • If the M75 Windshield Wiper Motor does not activate 
    1. Test circuit 91 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Test circuit 91 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the X50A Fuse Block - Underhood.
    • Go to next step: If the M75 Windshield Wiper Motor activates 
  19. Connect a 10 A fused jumper wire between the control circuit terminal 21 X2 and ground.
  20. Verify the M75 Windshield Wiper Motor activates.
    • If the M75 Windshield Wiper Motor does not activate 
    1. Test circuit 860 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Test circuit 860 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the X50A Fuse Block - Underhood.
    • Go to next step: If the M75 Windshield Wiper Motor activates 
  21. Replace the K219 Lighting Control Module.


Windshield Wiper Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the connector at the S82 Windshield Wiper/Washer Switch.
  2. Verify a test lamp illuminates between the low reference circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Test circuit 6009 for an open/high resistance.
      • If open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If open/high resistance is not found
    2. Replace the K9 Body Control Module
    • Go to next step: If the test lamp illuminates 
  3. Ignition ON.
  4. Verify the scan tool Windshield Wiper Switch parameter is not High.
    • If High 
    1. Test circuit 1715 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the K9 Body Control Module
    • Go to next step: If not High 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1.
  6. Verify the scan tool Windshield Wiper Switch parameter is High.
    • If not High 
    1. Test circuit 1715 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found
    2. Test circuit 1715 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the K219 Lighting Control Module.
    • Go to next step: If Active 
  7. Test for 4.8 - 5.2 V between the signal circuit terminal 3 and ground.
    • If less than 4.8 V 
    1. Test circuit 1714 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Test circuit 1714 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the K9 Body Control Module.
    • If greater than 5.2 V 
    1. Test circuit 1714 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If 4.8 - 5.2 V 
  8. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Wiper Motor Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 connector at the X50A Fuse Block - Underhood.
  2. Verify a test lamp illuminates between ground circuit terminal A2 and B+.
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 750 or ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Connect the X1 connector at the X50A Fuse Block - Underhood, disconnect the connector at the M75 Windshield Wiper Motor.
  4. Test for less than 10 Ω between the ground circuit terminal 5 and ground.
    • If 10 Ω or greater 

      Repair the open/high resistance on circuit 750 or ground connection.

    • Go to next step: If less than 10 Ω 
  5. Ignition ON.
  6. Verify the scan tool Windshield Wiper Mode parameter is not Parked.
    • If Parked 
    1. Test circuit 196 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the K219 Lighting Control Module.
    • Go to next step: If not Parked 
  7. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground circuit terminal 5.
  8. Verify the scan tool Windshield Wiper Mode parameter is Parked.
    • If not Parked 
    1. Test circuit 196 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Test circuit 196 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the K219 Lighting Control Module.
    • Go to next step: If Parked 
  9. Connect a test lamp between the following control circuits and ground, ignition ON.
    • Windshield Wiper Motor Low Speed Control Circuit Terminal 1
    • Windshield Wiper Motor High Speed Control Circuit Terminal 4
  10. Verify the test lamp does NOT turn ON and OFF when commanding the Windshield Wiper High and Low with a scan tool.
    • If the test lamp turns ON and OFF for both terminals 

      Test or replace the M75 Windshield Wiper Motor.

    • Go to next step: If the test lamp does not turn ON and OFF for one or both terminals 
  11. Ignition OFF, connect the harness connector at the M75 Windshield Wiper Motor. Disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
  12. Connect a 20 A fused jumper wire between the control circuit terminals listed below, one at a time, and B+.
    • Terminal B5
    • Terminal B6
  13. Verify the M75 Windshield Wiper Motor activates.
    • If the M75 Windshield Wiper Motor does not activate 
    1. Test the following circuits for a short to ground:
      • Circuit 92
      • Circuit 95
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Test the following circuits for an open/high resistance:
      • Circuit 92
      • Circuit 95
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the M75 Windshield Wiper Motor.
    • Go to next step: If the M75 Windshield Wiper Motor activates 
  14. Ignition OFF, connect the X1 connector at the X50A Fuse Block - Underhood. Disconnect the X2 connector at the K219 Lighting Control Module, ignition ON.
  15. Verify the M75 Windshield Wiper Motor low speed is not activated.
    • If the M75 Windshield Wiper Motor low speed is activated 
    1. Test circuit 91 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the X50A Fuse Block - Underhood.
    • Go to next step: If the M75 Windshield Wiper Motor low speed is not activated 
  16. Verify the M75 Windshield Wiper Motor High Speed is not activated.
    • If the M75 Windshield Wiper Motor high speed is activated 
    1. Test circuit 860 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the X50A Fuse Block - Underhood.
    • Go to next step: If the M75 Windshield Wiper Motor high speed is not activated 
  17. Connect a 10 A fused jumper wire between the control circuit terminal 12 X2 and B+.
  18. Verify the M75 Windshield Wiper Motor activates.
    • If the M75 Windshield Wiper Motor does not activate 
    1. Test circuit 91 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Test circuit 91 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the X50A Fuse Block - Underhood.
    • Go to next step: If the M75 Windshield Wiper Motor activates 
  19. Connect a 10 A fused jumper wire between the control circuit terminal 21 X2 and ground.
  20. Verify the M75 Windshield Wiper Motor activates.
    • If the M75 Windshield Wiper Motor does not activate 
    1. Test circuit 860 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Test circuit 860 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the X50A Fuse Block - Underhood.
    • Go to next step: If the M75 Windshield Wiper Motor activates 
  21. Replace the K219 Lighting Control Module.
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