Body Control System Description And Operation: Gateway

The BCM in this vehicle functions as a gateway or translator. The purpose of the gateway is to translate serial data messages between the CAN high speed bus and multiple LIN buses for communication between the various modules. The gateway will interact with each network according to that network's transmission protocol.

All communication between the BCM and a scan tool is on the high speed CAN serial data circuits. A lost communication DTC typically is set in modules other than the module with a communication failure.