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Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 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 appropriate front window motor.
  2. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
  3. Ignition ON, command the window UP and DOWN by using the front door 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 an open/high resistance. If the circuits test normal, replace the door module.
    • If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the door module.
  4. If all circuits test normal, test or replace the front window motor.
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