Export Body Control Module

The export body control system has an additional body control module located in the rear of the vehicle. This additional body control module is referred to as the XBCM. The XBCM has discrete input and output terminals to control additional vehicle body functions not supported by the primary body control module (BCM). The XBCM is wired to the low speed GMLAN serial data bus and the BCM and acts as a gateway between them. If the XBCM does not communicate, various rear end lighting such as rear fog lamps and trailer lighting will be impaired.

The various input and output circuits are described in the corresponding functional areas indicated on the XBCM electrical schematics. Some XBCM functions with the subsystems may be as a gateway only or as an enable for the system. The XBCM related systems/subsystems include, but are not limited to the following:

• Exterior lighting-Refer to Exterior Lighting Systems Description and Operation .
• Instrument cluster indicator control-Refer to Instrument Cluster Description and Operation .
• Theft deterrent-Refer to Theft Systems Description and Operation .