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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Lighting System) >> Diagnostic Information and Procedures >> Backup Lamps Malfunction (Automatic Transmission) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 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 appropriate backup lamp.
  2. Ignition OFF, exterior lamps OFF, test for less than 5 Ω 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 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, replace the backup lamp.
  8. If all circuits test normal, replace the park/neutral position (PNP) switch.
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