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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting >> Diagnostic Information and Procedures >> Backup Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Connect a test lamp between the relay side of the backup lamp fuse and ground.
  2. Ignition ON, verify that the test lamp turns on and off while commanding the backup lamps on and off with a scan tool.
    • If the test lamp does not turn on and off while changing between the commanded states, refer to Circuit/System Testing  For Backup Lamp Relay Control Circuit Test.
  3. If 1 or both of the backup lamps do not turn on and off, refer to Circuit/System Testing  For Backup Lamp Circuit Test.
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