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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 735 (Lighting Systems) >> Diagnostic Information and Procedures >> Backup Lamps Malfunction (Automatic Transmission) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  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 B 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 park/neutral position (PNP) switch.
  5. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
    • If the test lamp does not illuminate, test the B+ 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 4 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  7. Connect a 10 A fused jumper between the B+ circuit terminal 5 and the control circuit terminal 4. Ignition ON, verify the backup lamps are illuminated.
    • If the backup lamps do not illuminate, test the control circuit 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, replace the park/neutral position (PNP) switch.
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