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Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. 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 driver or passenger 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 door lock/window switch. The test lamp should turn ON 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 door lock/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 door lock/window switch.
  4. If all circuits test normal, test or replace the window motor.
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