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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Stop Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

  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 Left Rear Turn Signal/Brake Lamp 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 Right Rear Turn Signal/Brake Lamp 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 Brake 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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