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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.

Wiper/Washer Switch Circuit Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the S80 Window Wiper/Washer Switch.
  2. Test for less than 5 Ω between the ground circuit terminal 2 and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  3. Disconnect the X3 harness connector at the K9 Body Control Module.
  4. Test for less than 5 Ω between the signal circuit terminal 3 X1 at the S80 Window Wiper/Washer Switch and the signal circuit terminal 13 X3 at the K9 Body Control Module.
    • If greater than the specified value, test the signal circuit for an open/high resistance.
  5. Test for less than 5 Ω between the signal circuit terminal 1 X1 at the S80 Window Wiper/Washer Switch and the signal circuit terminal 20 X3 at the K9 Body Control Module.
    • If greater than the specified value, test the signal circuit for an open/high resistance.
  6. Test for infinite resistance between the signal circuit terminal 3 X1 at the S80 Window Wiper/Washer Switch and the signal circuit terminal 13 X3 at the K9 Body Control Module.
    • If not the specified value, test the signal circuit for a short to ground.
  7. Test for infinite resistance between the signal circuit terminal 1 X at the S80 Window Wiper/Washer Switch and the signal circuit terminal 20 X3 at the K9 Body Control Module.
    • If not the specified value, test the signal circuit for a short to ground.
  8. If all circuits test normal, test or replace the S80 Window Wiper/Washer Switch.

Windshield Wiper Motor Circuit Malfunction

  1. Ignition OFF, disconnect KR12B Windshield Wiper Relay.
  2. Test for less than 5 Ω between the ground circuit terminal 85 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Test for less than 5 Ω between the ground circuit terminal 87A and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 87 and ground.
    • If the test lamp does not illuminate, test or replace the underhood fuse block.
  5. Install a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
  6. Using the S80 Window Wiper/Washer Switch, command the low speed wipers ON and OFF. The test lamp should turn ON and OFF as commanded.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  7. Ignition OFF, disconnect the KR12C Windshield Wiper Speed Control Relay.
  8. Test for less than 5 Ω between the control circuit terminal 30 at the KR12B Windshield Wiper Relay socket and the control circuit terminal 30 at the KR12C Windshield Wiper Speed Control Relay socket.
    • If greater than the specified range, replace the underhood fuse block.
  9. Connect the KR12B Windshield Wiper Relay.
  10. Test for less than 5 Ω between the control circuit terminal 30 from the KR12C Windshield Wiper Speed Control Relay socket and ground.
    • If greater than the specified range, test or replace the KR12B Windshield Wiper Relay.
  11. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 85 from the KR12C Windshield Wiper Speed Control Relay socket and ground.
    • If the test lamp does not illuminate, test or replace the underhood fuse block.
  12. Install a test lamp between the control circuit terminal 30 from the KR12C Windshield Wiper Speed Control Relay socket and ground.
  13. Using the S80 Window Wiper/Washer Switch, command the low speed wipers ON. The test lamp should illuminate.
    • If the test lamp does not illuminate, replace the KR12B Windshield Wiper Relay.
  14. Install a test lamp between the B+ circuit terminal from the KR12C Windshield Wiper Speed Control Relay socket and the control circuit terminal 86 from the KR12C Windshield Wiper Speed Control Relay socket.
  15. Using the S80 Window Wiper/Washer Switch, command the high speed wipers ON and OFF. The test lamp should turn ON and OFF as commanded.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  16. Ignition OFF, connect the KR12C Windshield Wiper Speed Control Relay. Disconnect the harness connector X1 at the M75 Windshield Wiper Motor.
  17. Test for less than 5 Ω between the ground circuit terminal 4 and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  18. Connect a test lamp between the control circuit terminal 5 and ground.
  19. Using the S80 Window Wiper/Washer Switch, command the low speed wipers ON and OFF. The test lamp should turn ON and OFF as commanded.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the KR12C Windshield Wiper Speed Control Relay.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the KR12C Windshield Wiper Speed Control Relay.
  20. Connect a test lamp between the control circuit terminal 3 and ground.
  21. Using the S80 Window Wiper/Washer Switch, command the high speed wipers ON and OFF. The test lamp should turn ON and OFF as commanded.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the KR12C Windshield Wiper Speed Control Relay.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the KR12C Windshield Wiper Speed Control Relay.
  22. Ignition ON, wipers OFF, test for greater than 11 V between the signal circuit terminal 1 and ground.
    • If less than 11 V, test the signal circuit for a short to ground or an open high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  23. If all circuits test normal, test or replace the M75 Windshield Wiper Motor.
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