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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 >> Trailer Lamps Malfunction >> 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. Ignition ON.
  2. Verify the left and right stop lamps and center high mounted stop lamp on the vehicle turn ON and OFF when commanding the Stop Lamps ON and OFF with a scan tool.
    • If the left and right stop lamps and center high mounted stop lamp does not turn ON and OFF 

      Refer to Stop Lamps Malfunction .

    • If the left and right stop lamps and center high mounted stop lamp turns ON and OFF 

      Refer to Circuit/System Testing.

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