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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 >> Stop 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 scan tool Brake Pedal Applied parameter changes between Active and Inactive while pressing and releasing the brake pedal.
    • If the parameter does not change 

      Refer to Brake Pedal Position Sensor Malfunction.

    • If the parameter changes 
  3. Verify the left brake lamp turns ON and OFF when commanding the Stop Lamps ON and OFF with a scan tool.
    • If the left brake lamp does not turn ON and OFF 

      Refer to Stop Lamps Malfunction.

    • If the left brake lamp turns ON and OFF 
  4. Verify the right brake lamp turns ON and OFF when commanding the Stop Lamps ON and OFF with a scan tool.
    • If the right brake lamp does not turn ON and OFF 

      Refer to Stop Lamps Malfunction.

    • If the right brake lamp turns ON and OFF 
  5. Verify the center high mounted stop lamp turns ON and OFF when commanding the Center Stop Lamp ON and OFF with a scan tool.
    • If the center high mounted stop does not turn ON and OFF 

      Refer to Center High Mount Stop Lamp Malfunction.

    • If the center high mounted stop turns ON and OFF 
  6. All OK.
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