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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 873 (Fixed & MOVEABLE Window Systems) >> Diagnostic Information and Procedures >> Power Windows Malfunction (A31 w/o AN3, DL3) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Driver Power Window Inoperative

  1. Ignition OFF, disconnect the harness connector C2 at the driver window switch.
  2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal A and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal H and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Connect the harness connector C2 at the driver window switch, disconnect the harness connector at the driver window motor.
  5. Connect a test lamp between control circuit terminal A and control circuit terminal B.
  6. Command the driver window UP and DOWN by using the driver window switch. The test lamp should turn illuminate when commanding the UP and DOWN states.
    • If the test lamp remains OFF during either of the commands, test for a short to ground or open/high resistance on either control circuit. If the circuits test normal, replace the driver window switch.
  7. If all circuits test normal, test or replace the driver window motor.

Passenger Power Window Inoperative

  1. Ignition OFF, disconnect the harness connector at the passenger window switch.
  2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal F and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal G and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Connect a test lamp between the passenger window switch passenger down signal circuit terminal C and ground.
  5. Ignition ON, command the passenger window DOWN by using the RF window switch on the driver master control. The test lamp should illuminate during the DOWN command.
    • If the test lamp is always OFF, test for a short to ground on the signal circuit. If the circuits test normal, replace the driver window switch.
  6. Connect a test lamp between the passenger window switch passenger up signal circuit terminal A and ground.
  7. Command the passenger window UP by using the RF window switch on the driver master control. The test lamp should illuminate during the UP command.
    • If the test lamp is always OFF, test for a short to ground on the signal circuit. If the circuits test normal, replace the driver window switch.
  8. Ignition OFF, connect the passenger window switch and disconnect the harness connector at the passenger window motor.
  9. Connect a test lamp between control circuit terminal A and control circuit terminal B.
  10. Ignition ON, command the passenger window UP and DOWN by using the passenger window switch. The test lamp should turn ON when commanding the UP and DOWN states.
    • If the test lamp remains OFF during either of the commands, test for a short to ground or open/high resistance on either control circuit. If the circuits test normal, replace the passenger window switch.
  11. If all circuits test normal, test or replace the passenger window motor.

Rear Power Window Inoperative

  1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit terminal F and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal G and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Connect a test lamp between the power window switch rear down signal circuit terminal C and ground.
  5. Ignition ON, command the appropriate rear window DOWN by using the appropriate window switch on the driver master control. The test lamp should illuminate during the DOWN command.
    • If the test lamp is always OFF, test for a short to ground or open/high resistance on the signal circuit. If the circuits test normal, replace the driver window switch.
  6. Connect a test lamp between the power window switch rear up signal circuit terminal A and ground.
  7. Command the appropriate rear window UP by using the appropriate window switch on the driver master control. The test lamp should illuminate during the UP command.
    • If the test lamp is always OFF, test for a short to ground or open/high resistance on the signal circuit. If the circuits test normal, replace the driver window switch.
  8. Ignition OFF, reconnect the appropriate rear window switch.
  9. Ignition OFF, disconnect the power window lockout rear control circuit at the appropriate rear window switch.
  10. Ignition OFF, disconnect the harness connector at the appropriate rear window motor.
  11. Connect a test lamp between control circuit terminal A and control circuit terminal B.
  12. Ignition ON, command the appropriate rear window UP and DOWN by using the appropriate rear window switch. The test lamp should turn illuminate when commanding the UP and DOWN states.
    • If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the appropriate rear window switch.
  13. Reconnect the window master switch lockout circuit at the appropriate rear window switch.
  14. Command the appropriate rear window UP and DOWN by pressing the appropriate rear window switch. The test lamp should turn illuminate when commanding the UP and DOWN states.
    • If the test lamp remains OFF during either of the commands, test the window master switch lockout circuit for a short to ground. If the circuits test normal, replace the driver window switch.
  15. If all circuits test normal, test or replace the appropriate rear window motor.

Window Lockout Switch Malfunction

  1. Ignition ON, observe the scan tool Window Lockout Switch parameter while pressing the window lockout switch on the driver master control. The reading should change between ON and OFF.
    • If the scan tool Window Lockout Switch parameter is always OFF, replace the driver window switch.
    • If the scan tool Window Lockout Switch parameter is always ON, replace the driver window switch.
  2. Ignition OFF, disconnect the power window lockout rear control circuit at the appropriate rear window switch.
  3. Ignition ON, connect a test lamp between the power window lockout rear control circuit terminal D and ground.
  4. Command the rear window lockout ON and OFF by pressing the lockout switch on the driver master control. The test lamp should go ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to B+, if the circuit tests normal, replace the driver window switch.
    • 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 driver window switch.
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