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Home >> Hummer >> 2008 >> H3 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 88 (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 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.

Backup Lamps Always On

  1. Ignition OFF, disconnect the BU/LP relay.
  2. Ignition ON, verify that the backup lamps are not illuminated.
    • If the backup lamps are illuminated, test the relay controlled output circuit for a short to voltage.
    • If all circuits test normal, replace the BU/LP relay.

Backup Lamps Inoperative

  1. Ignition OFF, disconnect the BU/LP relay.
  2. Ignition ON, verify that a test lamp illuminates between the relay switch B+ circuit and ground.
    • If the test lamp does not illuminate, replace the rear fuse block.
  3. Test the relay controlled output circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BU/LP relay.
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