BCM Functions

The body control module (BCM) performs multiple body control functions. The BCM can control devices directly connected to its outputs based on input information. The BCM evaluates this information and controls certain body control systems by commanding outputs on or off. The BCM inputs can be:

• Sensors and switches that are directly connected to the BCM
• Class 2 serial data messages received from other vehicle systems connected to the class 2 serial data link
• GMLAN serial data messages received from other vehicles systems connected to the high speed GMLAN serial data link

The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific messages on the class 2 serial data link or high speed GMLAN serial data link. The system capable of performing the required function will respond to the BCM messages.

Some of the other system functions that BCM controls or contributes to are:

• Exterior lighting control-Refer to Exterior Lighting Systems Description and Operation .
• Interior lighting-Refer to Interior Lighting Systems Description and Operation .
• Automatic door locks-Refer to Power Door Locks Description and Operation .
• Keyless entry-Refer to Keyless Entry System Description and Operation .
• Theft deterrent-Refer to Content Theft Deterrent (CTD) Description and Operation .
• Wipers/washers-Refer to Wiper/Washer System Description and Operation .
• Headlamp washer-Refer to Headlamp Washer System Description and Operation .
• Cruise control-Refer to Cruise Control Description and Operation (Adaptive Cruise) or Cruise Control Description and Operation (Conventional Cruise) .
• Entertainment-Refer to Radio/Audio System Description and Operation .
• Column lock-Refer to Steering Wheel and Column Description and Operation .
• Power roof-Refer to Power Folding Top Description and Operation .