Module, Body Control (BCM): Description
The CUSW - Body Control Module is an electronic control unit that manages the main body functions of the vehicle thus performing gateway functions between high and low speed CAN and between LIN and CAN networks. Moreover, the BCM is an interconnecting unit that provides protected supply to many electrical loads by means of fuses.
The BCM is made by two main PCBs:
- The Power PCB which contains fuses, relays, and power connections.
- The Logic PCB which contains the microcontroller and the main solid state devices.
Power PCB and Logic PCB are in the same housing. The relays on the power PCB are soldered in place and are not individually serviceable.
The Body Control Module (BCM) (1) is mounted in the dashboard, left of the steering wheel, behind a removable aesthetic cover that allows the access to fuses mounted on the component and those found in the adjacent Junction Block (JB) (also known as the interior Power Distribution Center/PDC). The BCM has a molded plastic case that has integral receptacles in three clusters (1) for individual fuses on the rearward facing surface. The BCM is secured with screws within two stamped metal brackets that form a mounting yoke. The yoke is then secured with screws to the metal support structure of the instrument panel. The BCM is connected to the vehicle electrical system through eight wire harness connections. Six connector receptacles are integral to the rearward facing surface of the BCM case, while two connector receptacles are integral to the forward facing surface of the case.
The BCM software is flash programmable. Otherwise, the BCM cannot be adjusted or repaired and, if damaged or ineffective, the BCM must be replaced. The mounting brackets for the BCM as well as the fuses found in the BCM are individually serviceable.