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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 994 (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 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.

Driver Power Window Inoperative

  1. Ignition OFF, disconnect the X2 harness connector at the driver window switch.
  2. Test for less than 1 ohm 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 X2 harness connector 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 illuminate when commanding the UP and DOWN states.
    • If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground or open/high resistance. If the circuits test normal, replace the driver window switch.
    • If the test lamp is always ON, test either control circuit for a short to voltage. 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. Test for less than 1 ohm 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. Test for more than 10 volts on the signal circuit terminal C while commanding the passenger window DOWN using the RF window switch on the driver master control.
    • If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the driver window switch.
  5. Test for more than 10 volts on the signal circuit terminal A while commanding the passenger window UP using the RF window switch on the driver master control.
    • If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the driver window switch.
  6. Ignition OFF, connect the harness connector passenger window switch and disconnect the harness connector at the passenger window motor.
  7. Connect a test lamp between control circuit terminal A and control circuit terminal B.
  8. Ignition ON, command the passenger window UP and DOWN by using the passenger window switch. The test lamp should illuminate when commanding the UP and DOWN states.
    • If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground or open/high resistance. If the circuits test normal, replace the passenger window switch.
    • If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the passenger window switch.
  9. 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. Test for less than 1.0 ohm 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. Enable the rear window switches by using the window lockout switch.
  5. Test for more than 10 volts on the control circuit terminal D.
    • If less than the specified range, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the driver window switch.
  6. Test for more than 10 volts on the signal circuit terminal C while commanding the rear window DOWN using the window switch on the driver master control.
    • If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the driver window switch.
  7. Test for more than 10 volts on the signal circuit terminal A while commanding the rear window UP using the window switch on the driver master control.
    • If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the driver window switch.
  8. Ignition OFF, connect the harness connector at rear window switch and disconnect the harness connector at the rear window motor.
  9. Connect a test lamp between control circuit terminal A and control circuit terminal B.
  10. Ignition ON, command the rear window UP and DOWN by using the rear window switch. The test lamp should illuminate when commanding the UP and DOWN states.
    • If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground or open/high resistance. If the circuits test normal, replace the rear window switch.
    • If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the rear window switch.
  11. If all circuits test normal, test or replace the rear window motor.

Window Lockout Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
  2. Disable the rear window switches by using the window lockout switch on the driver master control.
  3. Test for 0 volts on the control circuit terminal D.
    • If greater than the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the driver window switch.
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