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Circuit/System Testing

  1. Turn ON the ignition with the engine OFF. Place the gear selector of the transmission in reverse. The reverse lamps should illuminate.
    • If the reverse lamps do not illuminate, go to Diagnostic Aids or Symptoms - Lighting Systems.
  2. Turn the ignition OFF, Disconnect the EBCM harness connector. Connect a test lamp between the backup lamp supply voltage circuit of the harness connector and ground. Turn the ignition ON and place the gear selector of the transmission in reverse.
    • If the test lamp does not illuminate, repair open in the backup lamp supply voltage circuit between the splice and the EBCM connector.
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