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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System & Washer System >> Diagnostic Information and Procedures >> Windshield Wiper Washer System Malfunction >> Circuit/System Testing
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Circuit/System Testing

Multifunction Switch Circuit/System Testing

  1. Ignition OFF, disconnect the C1 harness connector at the turn signal/multifunction switch.
  2. Ignition OFF, test for less than 15 ohms of resistance between the ground circuit terminal H and ground.
    • If greater than 15 ohms, test the ground circuit for an open/high resistance. If the circuit tests normal, test or replace the body control module.
  3. Verify the scan tool Windshield Wiper Switch parameter is Off.
    • If not Off, test the signal circuit terminal L for a short to ground. If the circuit tests normal, test or replace the body control module.
  4. Verify the scan tool Wiper High Speed Switch parameter is Inactive.
    • If not Inactive, test the signal circuit terminal K for a short to ground. If the circuit tests normal, test or replace the body control module.
  5. Install a 3-amp fused jumper wire between the signal circuit terminal L and ground. Verify the scan tool Windshield Wiper Switch parameter is Switch Fault.
    • If not Switch Fault, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the body control module.
  6. Install a 3-amp fused jumper wire between the signal circuit terminal K and ground. Verify the scan tool Wiper High Speed Switch parameter is Active.
    • If not Active, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the body control module.
  7. If all circuits test normal, test or replace the turn signal/multifunction switch.

Wipers Do Not Park Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the windshield wiper motor.
  2. Ignition ON, verify the scan tool BCM Wiper Park Switch parameter is Inactive.
    • If not Inactive, test the signal circuit terminal C for a short to ground. If the circuit tests normal, test or replace the body control module.
  3. Install a 3-amp fused jumper wire between the wiper motor park switch signal circuit terminal C and ground. Verify the scan tool Wiper Park Switch parameter is Active.
    • If not Active, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the body control module.
  4. If all circuits test normal, test or replace the windshield wiper motor.

Wiper Motor Circuit/System Testing

  1. Ignition OFF, disconnect the C1 harness connector at the underhood fuse block.
  2. Test for less that 5 ohms of resistance between the wiper relay ground circuit terminal 16 and ground.
    • If greater than 5 ohms, test the ground circuit for an open/high resistance.
  3. Ignition OFF, disconnect the C2 harness connector at the underhood fuse block.
  4. Connect a test lamp between the control circuit terminal 27 and ground.
  5. Command the Wiper Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • 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 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, test or replace the body control module.
  6. Connect a test lamp between the control circuit terminal 11 and battery voltage.
  7. Command the Wiper High Speed Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, test or replace the 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, test or replace the body control module.
  8. Ignition OFF, connect the C1 and C2 harness connectors at the underhood fuse block.
  9. Disconnect the harness connector at the wiper motor.
  10. Test for less that 1 ohm of resistance between the wiper motor ground circuit terminal D and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  11. Connect a test lamp between the control circuit terminal B and ground.
  12. Command the Wiper Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • 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 underhood fuse block.
    • 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 underhood fuse block.
  13. Connect a test lamp between the control circuit terminal A and ground.
  14. Command the Wiper High Speed Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • 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 underhood fuse block.
    • 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 underhood fuse block.
  15. If all circuits test normal, test or replace the Windshield Wiper Motor.
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