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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Lighting System - DTC B3891 To DTC C0297 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Backup Lamps Malfunction (Manual Transmission (without LF4)) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine ON.
  2. Verify the scan tool Reverse Position Switch parameter changes between ON and OFF while shifting the vehicle between the neutral and reverse gears.
    • If the parameter does not change 

      Refer to Backup Lamp Switch Malfunction.

    • If the parameter changes 
  3. Verify the backup lamps turn ON and OFF when commanding the Backup Lamps ON and OFF with a scan tool.
    • If the backup lamps do not turn ON and OFF 

      Refer to Backup Lamps Malfunction.

    • If the backup lamps turn ON and OFF 
  4. All OK.
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