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Home >> Chevrolet >> 2012 >> Traverse LS, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 256 (Wiper System And Washer System) >> Diagnostic Information and Procedures >> Rear Wiper System Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

Rear 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.
    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. Test for greater than 8 V between the signal circuit terminal 4 and ground.
    • If less than 8 V 
    1. Ignition OFF, disconnect the X2 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 
  5. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
  6. Test for less than 1 V between the S82 Windshield Wiper/Washer Switch signal circuit terminal 4 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

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

Rear Wiper Motor Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the KR7 Rear Wiper Relay. 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 listed below and ground.
    • Terminal 86
    • Terminal 87A
    • 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 a test lamp illuminates between the B+ circuit terminal 87 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Replace the X50A Fuse Block - Underhood.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp. Disconnect the harness connector at the M45 Rear Wiper Motor.
    2. Test for infinite resistance between the control circuit terminal 30 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the KR7 Rear Wiper Relay
      • If the test lamp illuminates 
    3. Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86.
    4. Verify the test lamp turns ON and OFF when commanding the Rear Wiper Active and Inactive with a scan tool.
      • If the test lamp is always OFF  
    5. Ignition OFF, remove the test lamp, disconnect the X4 harness connector at the K9 Body Control Module.
    6. Test for infinite resistance between the control circuit terminal 10 X4 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    7. 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 K9 Body Control Module.
      • If the test lamp is always ON 
    8. Ignition OFF, remove the test lamp, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
    9. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
      • If the test lamp turns ON and OFF 
    10. Verify that a test lamp does not illuminate between the control circuit terminal 30 and ground.
      • If the test lamp illuminates  

        Repair the short to voltage on the control circuit

      • If the test lamp does not illuminate 
    11. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M45 Rear Wiper Motor. It may take up to 2 min for all vehicle systems to power down.
    12. Test for less than 10 Ω between the ground circuit terminal C and ground.
      • If 10 Ω or greater 
    13. Ignition OFF.
    14. 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 
    15. Connect the harness connector at the M45 Rear Wiper Motor.
    16. Ignition ON, connect a 20 A fused jumper wire between the B+ circuit terminal 87 and the control circuit terminal 30.
    17. Verify the M45 Rear Wiper Motor is activated.
      • If the M45 Rear Wiper Motor does not activate 
    18. Ignition OFF, remove the jumper wire, disconnect the harness connector at the M45 Rear Wiper Motor.
    19. 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
    20. 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 M45 Rear Wiper Motor.
      • If the M45 Rear Wiper Motor activates 
  5. Test or replace the KR7 Rear Wiper Relay

Wiper Park Feature Malfunction

  1. Ignition OFF, disconnect the harness connector at the M45 Rear Wiper Motor. Ignition ON
  2. Verify a test lamp illuminates between the B+ circuit terminal B and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If the test lamp illuminates 
  3. Test or replace the M45 Rear Wiper Motor.
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