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Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Canyon and 2009 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

Backup Lamps Malfunction - Automatic Transmission

  1. Ignition OFF, disconnect the harness connector at the inoperative backup lamp.
  2. Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal G and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect the harness connector at the inoperative backup lamp.
  4. Ignition OFF, disconnect the harness connector at the backup lamp switch.
  5. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance.
  6. Verify that a test lamp does not illuminate between the control circuit terminal B and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  7. Connect a 15-amp fused jumper between the control circuit terminal A and the control circuit terminal B. Verify the backup lamps illuminate.
    • If the backup lamps do not illuminate, test the control circuit terminal B for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the inoperative backup lamp.
  8. If all circuits test normal, test or replace the backup lamp switch.

Backup Lamps Malfunction - Manual Transmission

  1. Ignition OFF, disconnect the harness connector at the inoperative backup lamp.
  2. Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal G and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect the harness connector at the inoperative backup lamp.
  4. Ignition OFF, disconnect the harness connector at the PNP switch.
  5. Ignition ON, verify that a test lamp illuminates between the control circuit terminal 11 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance.
  6. Verify that a test lamp does not illuminate between the control circuit terminal 10 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  7. Connect a 15-amp fused jumper between the control circuit terminal 11 and the control circuit terminal 10. Verify the backup lamps illuminate.
    • If the backup lamps do not illuminate, test the control circuit terminal 10 for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the inoperative backup lamp.
  8. If all circuits test normal, test or replace the PNP switch.
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