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Home >> Buick >> 2012 >> Regal Turbo, Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System >> Diagnostic Information and Procedures >> Backup Lamps Malfunction (Automatic Transmission) >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate E5 backup lamp.
  2. Ignition OFF, exterior lamps OFF, test for less than 5 Ω between the ground circuit terminal 3 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 2 and ground.
  4. Ignition ON, command the Backup Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 body control module.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
  5. If all circuits test normal, replace the E5 backup lamp.
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