Circuit/System Verification

Ignition ON.
Perform the brake pedal position sensor learn procedure for the K9 Body Control Module. Refer to Brake Pedal Position Sensor Calibration .
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
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.
- Go to next step: If the center high mounted stop turns ON and OFF
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
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
Observe the left and right outer tail/stop lamps while activating the stop lamps. The left and right outer tail/stop lamps should illuminate when turned ON.
- If the left or right outer tail/stop lamp does not illuminate
  Refer to Tail/Stop Lamp Outage Detection Malfunction.
- Go to next step: If the left and right outer tail/stop lamps illuminate
All OK.