ELECTRICAL 127 ELECTRICAL 8.12 BODY CONTROL MODULE (BCM) DESCRIPTION: The body control module is the primary hub that maintains functions, such as internal and external lighting, security and access control, comfort features for doors, and other convenience controls. The BCM also acts as a terminating resistor for EMS – IMMO CAN Network. FEATURES OF BCM Limp Home Mode Monitors BCM Microcontroller Health through in built Failsafe circuitry. Without ignition ON turn on the .Left / Right Indicators (non-flash mode), parking lamp, Head lamp and rear fog lamp. BCM Power mode The BCM will support the following power modes internally. BATTERY RUN In BATTERY mode, the required circuits are active to allow functionality when the vehicle engine is not running. Current consumption should be less than 6mA. Diagnostics is not active in BATTERY mode. In RUN mode, all circuits are active and full functionality is available. Stuck Switch Monitoring The Stuck Switch monitoring of certain momentary switch inputs is used to detect when a momentary switch is in the activated position for a period longer than a predefined timeout and maybe “stuck.” A DTC shall be set when a stuck switch is detected. The switch input is then ignored for the rest of that ignition cycle or until the switch is operated correctly. Following switches are monitored for switch stuck functionality (60 sec’s timeout period), Hazard Switch Front wash switch Rear wash switch LOCATION: It is located on BCM mtg bkt on assy dash cross member.
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