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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 22 (FIXED AND MOVEABLE WINDOWS)DIAGNOSTIC INFORMATION AND PROCEDURESMIDGATE POWER WINDOW INOPERATIVECIRCUIT/SYSTEM TESTING
2008 Pontiac Grand Prix Base

Circuit/System Testing

2008 Pontiac Grand Prix BaseSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

Midgate Power Window Inoperative

  1. Disconnect the midgate control module connector.
  2. Verify that a test lamp illuminates between the battery supply circuits and ground.
    • If the test lamp does not illuminate repair the battery supply circuits for an open/high resistance or short to ground.
  3. Ignition ON, verify that a test lamp illuminates between the accessory supply circuit and ground.
    • If the test lamp does not illuminate repair the accessory supply circuit for an open/high resistance or short to ground.
  4. Ignition OFF, verify that a test lamp illuminates between the ground circuits and battery voltage.
    • If the test lamp does not illuminate repair the ground circuits for an open/high resistance.
  5. Ignition ON, the down switch signal circuit should at or near battery voltage while the IP switch is held in the down position.
    • If the circuit is not at battery voltage repair the down switch signal circuit for an open/high resistance or a short to ground.
  6. If all the circuits test normal replace the window motor assembly.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.