GM Service Manual Online
For 1990-2009 cars only

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit/System Description

The power window/mirror switch and rear window switch control the up/down operation of the rear power windows when requested. The power window/mirror switch power supply is controlled by the RAP (retained accessory power) relay.

Reference Information

Schematic Reference

Moveable Window Schematics Power Window Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

    •  Circuit Testing .
    •  Connector Repairs .
    •  Testing for Intermittent Conditions and Poor Connections .
    •  Wiring Repairs .

Circuit/System Verification

  1. Verify that the Retained Accessory Power (RAP) circuit is functioning normally.
  2. If the RAP is not functioning normally refer to Retained Accessory Power (RAP) Description and Operation .
  3. Verify that the opposite rear window is working from its rear power window switch.

Power Window Switch Testing

  1. Make sure that the window lock-out button on the power window/mirror switch is not selected.
  2. Ignition Off, disconnect the power window switch harness connector.
  3. Verify less than 1 ohm of resistance from the ground circuit terminal 2 and ground.
  4. If the resistance is greater than the specified value, repair the ground circuit for an open/high resistance.
  5. Ignition ON, test for 12 volts between the supply voltage circuit terminal 4 and ground.
  6. If the voltage is not between 9-16 volts, repair the supply voltage circuit for an open/high resistance.
  7. Connect a fused jumper wire between supply voltage circuit 4 and signal terminal 5.
  8. Connect a fused jumper wire between supply ground circuit 2 and terminal 1, ignition On.
  9. If the window opens replace the power window switch.
  10. Test the power/ground supply circuits from the rear power window switch to the window motor for a short to ground, short to voltage or an open/high resistance.
  11. If all circuits test normal, replace the window motor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Rear Side Door Window Switch Replacement .
    •  Rear Side Door Window Regulator Motor Replacement .