Scan Tool Data Definitions - Body Control Module (BCM)

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

PRNDL Illumination: The scan tool displays 0-100%. The illumination percentage varies based upon the dimming switch information sent by the IPC on the serial data line. When the dimming switch is rotated to bright, the PRNDL illumination percentage will increase. When the dimming switch is rotated to dim, PRNDL illumination percentage will decrease. The headlamps or parklamps must be ON to read PRNDL illumination data.

HVAC Bulb Illumination: The scan tool displays 0-100%. The illumination percentage varies based upon the dimming switch information sent by the IPC on the serial data line. When the dimming switch is rotated to bright, the HVAC illumination percentage will increase. When the dimming switch is rotated to dim, HVAC illumination percentage will decrease. The headlamps or parklamps must be ON to read HVAC illumination data.

Console Switch Illumination: The scan tool displays 0-100%. The illumination percentage varies based upon the dimming switch information sent by the IPC on the serial data line. When the dimming switch is rotated to bright, the console switch illumination percentage will increase. When the dimming switch is rotated to dim, console switch illumination percentage will decrease. The headlamps or parklamps must be ON to read console illumination data.

Fog Light Illumination: The scan tool displays 0-100%. The illumination percentage varies based upon the dimming switch information sent by the IPC on the serial data line. When the dimming switch is rotated to bright, the fog light switch illumination percentage will increase. When the dimming switch is rotated to dim, fog light switch illumination percentage will decrease. The headlamps or parklamps must be ON to read fog light illumination data.

DRL Ambient Light Sensor: The scan tool displays 0-5.0 volts. The voltage level varies based upon the ambient light level at the sensor. When light levels are high (Light), voltage will increase. When light levels are low (Dark), voltage will decrease. The BCM uses this information for automatic headlamp operation.

Inadvertent Load Monitor: The scan tool displays active or inactive. When the BCM energizes the inadvertent load monitor relay the scan tool will display active. When the BCM de-energizes the inadvertent load monitor relay the scan tool will display inactive. The inadvertent load monitor system is used for battery run down protection. The BCM removes battery voltage to accessories that were left on by de-energizing the monitored load relay.

Headlamp Off Switch: The scan tool displays Active or Inactive. When the headlamps are OFF, the scan tool will display Active. When the headlamps are ON, the scan tool displays Inactive.

Front Fog Light Switch: The scan tool displays Active or Inactive. When the front fog light switch is pressed, the scan tool will display Active. When the switch is released, the scan tool displays Inactive.

Rear Fog Light Switch: The scan tool displays Active or Inactive. When the rear fog light switch is pressed, the scan tool will display Active. When the switch is released, the scan tool displays Inactive.

Right Turn Monitor: The scan tool displays Active or Inactive. When the BCM detects the right turn signal is ON, the scan tool will display Active. When the BCM detects the right turn signal is OFF, the scan tool will display Inactive.

Right Turn Signal Relay: The scan tool displays Active or Inactive. When the BCM energizes the right DRL relay, the scan tool will display Active. When the BCM de-energizes the right DRL relay, the scan tool will display Inactive.

Left Turn Monitor: The scan tool displays Active or Inactive. When the BCM detects the left turn signal is ON, the scan tool will display Active. When the BCM detects the left turn signal is OFF, the scan tool will display Inactive.

Left Turn Signal Relay: The scan tool displays Active or Inactive. When the BCM energizes the left DRL relay, the scan tool will display Active. When the BCM de-energizes the left DRL relay, the scan tool will display Inactive.

Backup Light Request: The scan tool displays Active or Inactive. When the BCM energizes the backup light relay, the scan tool will display Active. When the BCM de-energizes the backup light relay, the scan tool will display Inactive.

Driver Door Ajar Switch: The scan tool displays Open or Closed. When the driver door is open, the scan tool will display Open. When the driver door is closed, the scan tool displays Closed.

Passenger Door Ajar Switch: The scan tool displays Open or Closed. When the passenger door is open, the scan tool will display Open. When the passenger door is closed, the scan tool displays Closed.