BCM Scan Tool Data Definitions

The body control module (BCM) Scan Tool Data Definitions contains a brief description of all Lighting System related BCM parameters available on the scan tool.

Cruise Control Data List

Stop Lamp Signal: The scan tool displays ON/OFF. When the powertrain control module (PCM) or engine control (ECM) detects the stop lamps are applied, the scan tool will display ON.

BCM Data List

Brake Apply Sensor: The scan tool displays volts. The voltage level varies as the brakes are applied.

BCM Inputs

Flash to Pass: The scan tool displays ON/OFF. When the multifunction switch is placed on the flash to pass (FTP) position, the scan tool will display ON.

Hazard Switch Signal:  The scan tool displays ON/OFF. When the hazard switch is placed in the ON position, the scan tool will display ON.

Headlamp OFF Switch: The scan tool displays ON/OFF. When the headlamp switch is placed in the OFF position, the scan tool will display ON.

High Beam Switch: The scan tool displays ON/OFF. When the headlamp dimmer switch is placed in the HIGH position, the scan tool will display ON.

Interior Light Switch: The scan tool displays ON/OFF. When the interior light switch is placed in the DOME position, the scan tool will display ON.

Interior Lights Power: The scan tool displays ON/OFF. When the interior lamps switch has voltage applied, the scan tool will display ON.

Left Turn Signal: The scan tool displays ON/OFF. When the turn signal switch is placed in the LEFT turn position, the scan tool will display ON.

Low Beam Switch: The scan tool displays ON/OFF. When the headlamp dimmer switch is placed in the LOW position, the scan tool will display ON.

LR Door Open Switch: The scan tool displays ON/OFF. When the LR door is open, the scan tool will display ON.

Park Brake Switch: The scan tool display ON/OFF. When the park brake is applied, the scan tool will display ON.

Park Lamp Switch: The scan tool displays ON/OFF. When the headlamp switch is in the PARK position, the scan tool will display ON.

RF Door Lock Switch: The scan tool displays ON/OFF. When the RF door is open, the scan tool will display ON.

RR Door Open Switch: The scan tool displays ON/OFF. When the RR door is open, the scan tool will display ON.

Right Turn Signal: The scan tool displays ON/OFF. When the turn signal switch is placed in the right turn position, the scan tool will display ON.

BCM Outputs

Backup Lamps: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the backup lamps are turned ON.

Brake Applied Outputs: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the brake pedal is applied.

Instrumentation Backlight: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the instrument panel (I/P) lamps are commanded ON by the BCM.

Interior Lamp Output: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the interior lamps are turned ON.

LF Turn/DRL Lamp Status: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the left turn signal is turned ON or when the BCM turns ON the daytime running lamps (DRL).

LR Stop/Turn Signal Lamp: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the left turn signal is turned ON or when the brakes are applied.

Low Beam Relay Command: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the low beam headlamps are turned ON.

Park Lamp Relay: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the park lamps are turned ON.

RF Turn/DRL lamp Status: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the right turn signal is turned ON or when the BCM turns ON the DRL.

RR Stop/Turn Signal Lamp: The scan tool displays ON/OFF. This output of the BCM is displayed as ON when the right turn signal is turned ON or when the brakes are applied.

BASS Data List

BASS High During Learn: The scan tool displays NO/YES. If a short to battery positive voltage is detected in the stop lamp switch signal circuit during calibration, then the scan tool will display YES.

BASS Learned: The scan tool displays NO/YES. When the brake pedal position sensor has been calibrated correctly, the scan tool will display YES.

BASS Low During Learn: The scan tool displays NO/YES. If a short to ground is detected in the stop lamp switch signal circuit during calibration, then the scan tool will display YES.

BASS Moved During Learn: If the brake pedal is moved during calibration, the scan tool will display YES.

BASS Valid: The scan tool displays NO/YES. When the brake pedal position sensor has been calibrated correctly, the scan tool will display YES.

Brake Lamp: The scan tool displays ON/OFF. When the brake is applied the scan tool will display ON.

Current Position: The scan tool displays COUNTS. The brake pedal position sensor applies a varying voltage to the BCM. The BCM then calculates the current position of the brake pedal.

Learned Home Position: The scan tool displays COUNTS. The BCM displays the home position of the brake pedal position sensor.

Learn in Progress: The scan tool displays NO/YES. When the brake pedal position sensor is being calibrated, the scan tool will display YES.