General Information

The Body Control Module (BCM) controls a number of functional systems. The BCM is connected to the class 2 serial data line. Many control signals are implemented via class 2 messages. The BCM, which is the Power Mode Master (PMM), is responsible for sending the power mode messages on the serial data line to other modules. The BCM functions include the following:
^ HVAC afterblow control
^ Battery guard
^ Chime request
^ Content Theft Deterrent (CTD)
^ Controlled power
^ Door lock and unlock
^ Exterior lighting control
^ Fuel door release
^ Fuel level
^ Interior lighting control
^ Retained Accessory Power (RAP)
^ Rear defogger
^ Serial data power mode messages
^ Storage Mode
^ SIR deployment unlock
^ Time of day for the radio display
^ Trunk release
^ Vehicle personalization