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Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. 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.

    • Go to next step: If the parameter changes 
  3. Verify the left stop lamp turns ON and OFF when commanding the Left Stop Lamp ON and OFF with a scan tool.
    • If the left stop lamp does not turn ON and OFF 

      Refer to Stop Lamps Malfunction

    • Go to next step: If the left stop lamp turns ON and OFF 
  4. Verify the right stop lamp turns ON and OFF when commanding the Right Stop Lamp ON and OFF with a scan tool.
    • If the right stop lamp does not turn ON and OFF 

      Refer to Stop Lamps Malfunction.

    • Go to next step: If the right stop lamp turns ON and OFF 
  5. Verify the left auxiliary tail/stop lamp turns ON and OFF when commanding the E5LC Tail/Stop Lamp - Auxiliary Left ON and OFF with a scan tool.
    • If the left auxiliary tail/stop lamp does not turn ON and OFF 

      Refer to Stop Lamps Malfunction - Auxiliary.

    • Go to next step: If the left auxiliary tail/stop lamp turns ON and OFF 
  6. Verify the right auxiliary tail/stop lamp turns ON and OFF when commanding the E5RC Tail/Stop Lamp - Auxiliary Right ON and OFF with a scan tool.
    • If the right auxiliary tail/stop lamp does not turn ON and OFF 

      Refer to Stop Lamps Malfunction - Auxiliary.

    • Go to next step: If the right auxiliary tail/stop lamp turns ON and OFF 
  7. Verify the left and right auxiliary stop lamps turn ON and OFF when opening and closing the rear compartment lid.
    • Go to next step: If the left and right auxiliary stop lamps turn ON and OFF 
  8. 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.

    • Go to next step: If the center high mounted stop turns ON and OFF 
  9. All OK.
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