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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 252 (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 2008 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

Midgate Window Inoperative

  1. Ignition OFF, disconnect the harness connector at the midgate module.
  2. Test for less than 1 ohm between ground circuit terminal 6 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Test for less than 1 ohm between ground circuit terminal 16 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the B+ circuits 10 and 20 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  5. Verify that a test lamp illuminates between the ignition circuit terminal 8 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  6. Connect a test lamp between the signal circuit terminal 19 and ground.
  7. Command the midgate window UP using the window switch on the driver master control. The test lamp should illuminate while commanding the UP state.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the DDS.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DDS.
  8. Connect a test lamp between the signal circuit terminal 3 and ground.
  9. Command the midgate window DOWN using the window switch on the driver master control. The test lamp should illuminate while commanding the DOWN state.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the DDS.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DDS.
  10. If all the circuits test normal replace the midgate module.

Midgate Window Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the midgate window switch.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A and ground.
    • If the test lamp is always OFF, test the ignition circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, reconnect the midgate window switch and disconnect the harness connector at the midgate module.
  4. Connect a test lamp between signal circuit terminal 2 and ground.
  5. Ignition ON, command the midgate window UP by using the midgate window switch. The test lamp should turn illuminate while commanding the UP state.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, test or replace the midgate window switch.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the midgate window switch.
  6. Connect a test lamp between the signal circuit terminal 3 and ground.
  7. Command the midgate window DOWN by using the midgate window switch. The test lamp should turn ON when commanding the DOWN state.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, test or replace the midgate window switch.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the midgate window switch.
  8. If all circuits test normal, replace the midgate module.
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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.