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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 992 (Fixed & MOVEABLE Window Systems) >> Diagnostic Information and Procedures >> Power Rear Sliding Window Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the sliding rear window switch.
  2. Ignition ON, verify the test lamp illuminates between the accessory voltage circuit terminal A and ground.
    • If the test lamp does not illuminate, test the accessory voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the BCM.
  3. Ignition OFF, reconnect the sliding rear window switch and disconnect the appropriate sliding rear window relay.
  4. Test for less than 1.0 ohm between the ground circuit terminal B2 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  5. Test for less than 1.0 ohm between the ground circuit terminal A1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  6. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal C1 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  7. Verify that a test lamp illuminates between the B+ circuit terminal A2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  8. Connect a test lamp between the control circuit terminal C2 and the ground circuit terminal A1.
  9. Command the power sliding window to OPEN and CLOSE by using the sliding rear window switch. The test lamp should turn ON and OFF when changing between the commanded states.
    • 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 sliding rear window switch.
    • 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 sliding rear window switch.
  10. Install the appropriate sliding rear window relay.
  11. Ignition OFF, disconnect the harness connector at the sliding rear window motor.
  12. Ignition OFF, test for less than 5.0 ohms between the control circuit terminal A and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the sliding rear window close relay.
  13. Ignition OFF, test for less than 5.0 ohms between the control circuit terminal B and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the sliding rear window open relay
  14. Connect a test lamp between control circuit terminal A and control circuit terminal B.
  15. Ignition ON, command the sliding rear window to OPEN and CLOSE by using the sliding rear window switch. The test lamp should turn ON when commanding the OPEN and CLOSE states.
    • If the test lamp is always OFF, test the control circuit for a short to ground. If the circuit tests normal, test or replace the appropriate sliding rear window relay.
  16. If all circuits test normal, test or replace the sliding rear window motor.
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