Body Control Module (BCM)

The BCM gates signals for the ASBM between the Local Interior Network (LIN) bus and the CAN C bus. The DTCM receives the request from the BCM over the CAN C network bus to engage the axle lockers. The DTCM evaluates the interlocks to determine if conditions are met to lock the axles. If conditions are met to lock the axles, the DTCM attempts to lock the front or rear axle. If conditions are not met to lock axles, the DTCM will do one of the following depending on the type of request and the current vehicle conditions:

• Reject the locker engagement and request the IPC to describe which conditions are not met to achieve engagement
• Request the IPC to describe which conditions are not met and allow the driver time to correct the conditions preventing the locker engagement before rejecting the shift

The BCM receives DTCM output CAN C messages containing ASBM switch LED illumination requests. The BCM gates these DTCM CAN C messages to LIN message request and then sends these message requests to the ASBM to illuminate the appropriate switch based on the message received, front or rear.