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Home >> Hummer >> 2008 >> H3 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Lighting Systems) >> Diagnostic Information and Procedures >> Backup Lamps Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the park neutral position or backup lamp switch connector.
  2. Ignition ON, the backup lamps should not be illuminated.
    • If the backup lamps are illuminated, test the listed backup lamp control circuit for a short to voltage.
      • Park neutral position switch terminal 10
      • Backup lamp switch terminal B
  3. Connect a test lamp between the listed switch supply circuit and ground. The test lamp should illuminate.
    • Park neutral position switch terminal 11
    • Backup lamp switch terminal A
    • If the test lamp does not illuminate, test the switch supply circuit for an open/high resistance or short to ground.
  4. Connect a fused jumper wire between the listed switch supply circuit and backup lamp control circuit. Both backup lamps should illuminate.
    • Park neutral position switch terminal 11 to terminal 10
    • Backup lamp switch terminal A to terminal B
    • If both backup lamps are not illuminated, test the backup lamp control circuit for a open/high resistance or short to ground.
    • If one backup lamp is not illuminated test the affected control and ground circuits for an open/high resistance. If the circuits test normal replace the affected backup lamp bulb.
  5. If all circuits test normal, test or replace the park neutral position or backup lamp switch.
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