Body Control Module (BCM)

The following are the ACC system functions provided by the BCM:

• The BCM provides a translating gateway between the class 2 serial data circuit and the high speed GMLAN serial data circuit.
• The BCM reads all cruise control switches and the gap switch. The ACM monitors a variety of user operated switches from the BCM switch status information sent via the GMLAN serial data circuit.
• The BCM illuminates the brake light based on a GMLAN message from the ACM during automatic braking.
• The BCM measures the brake pedal position and sends brake pedal travel status via GMLAN serial data circuit to the ECM. The ECM disengages the ACC system when the brake is applied by the driver pressing the brake pedal.
• The BCM serves as a gateway to the display system's (HUD, IPC, DIC and Amplifier) visual and audible warnings. The BCM will generate visual and audible warning class 2 messages based on high speed GMLAN signals from the ACM.