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Home >> Hummer >> 2008 >> H3 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 106 (Sunroof System) >> Diagnostic Information and Procedures >> Power Sunroof Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the sunroof switch.
  2. Test for less than 5 ohms between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the following ground circuits for an open/high resistance. If the circuits test normal, replace the sunroof motor/actuator.
      • Sunroof switch low reference circuit terminal B
      • Sunroof motor/actuator harness connector ground circuit terminal 1
  3. Connect a 3A fused jumper wire between the following sunroof switch signal circuits and ground. The roof should be inoperative in at least one or more directions.
    • Terminal C sunroof switch open signal
    • Terminal A sunroof switch close signal
    • If the roof moved in all directions, replace the sunroof switch.
  4. Ignition OFF, disconnect the harness connector at the sunroof control module.
  5. Test for less than 5 ohms between the ground circuit terminal 1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  6. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
    • If the test lamp does not illuminate, repair the B+ circuit for a short to ground or an open/high resistance.
  7. Verify that a test lamp illuminates between the ignition voltage circuit terminal 3 and ground.
    • If the test lamp does not illuminate, repair the ignition voltage circuit for a short to ground or an open/high resistance.
  8. Ignition OFF, connect the harness connector at the sunroof control module.
  9. Ignition ON, test for B+ between the following sunroof switch signal circuits and ground.
    • Sunroof switch open signal terminal C.
    • Sunroof switch close signal terminal A.
    • If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the sunroof control module.
  10. If all circuit test normal, replace the sunroof control module.
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