The only adjustment, is what is called a brake sensor recalibrate. this is only usually done after the switch has been replaced or some sort of reprogramming has been done. here is the wiring diagram, and how the system works along with the calibration. but keep in mind, the ONLY WAY, this can be ajusted or reclaibrated is with a GM TECH SCAN tool.
If there is anything else I can answer, please feel free to ask!!!
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. When the stop lamp relay receives battery voltage from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the STOP LP fuse to illuminate the center high mounted stop lamp (CHMSL).
The brake pedal position sensor (BPPS) receives a low reference signal and a 5-volt reference signal from the BCM. Whenever the brake pedal is applied, the BPPS applies a variable voltage signal to the BCM through the stop lamp switch signal circuit. The BPPS calibration must be performed after the BPPS or body control module (BCM) have been serviced. The calibration procedure will set BPPS home value. This value is used by the BCM to determine the action of the driver applying the brake system and to provide this information to the vehicle subsystems via the class 2 communication bus.
Brake Pedal Position Sensor Calibration
- Install a scan tool.
- Select Diagnostics.
- Turn ON the ignition, with the engine OFF.
- Select the vehicle.
- Select Body and Accessories.
- Select Lighting Systems.
- Select Module Setup.
- Select BCM.
- Select the BPPS calibration procedure and follow the directions displayed on the screen.