Torrent AWD V6-3.4L VIN F (2006)
Body Control Module: Description and Operation
Body Control System
BODY CONTROL SYSTEM DESCRIPTION AND OPERATION
BCM OVERVIEW
The main features of the body control module (BCM) are:
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The BCM is the gateway between class 2 serial data circuit and high speed GMLAN serial data circuit.
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The BCM controls multiple functions.
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The BCM is the power mode master.
GATEWAY
The body control module (BCM) communicates functionally on both class 2 and high speed GMLAN serial data buses. The BCM is the gateway
between the buses and transfers serial data messages from one subnet to another. Physical communication of the BCM with the scan tool is through
class 2 serial data circuit.
BCM FUNCTIONS
The body control module (BCM) performs multiple body control functions. The BCM can control devices directly connected to its outputs based on
input information. The BCM evaluates this information and controls certain body control systems by commanding outputs on or off. The BCM inputs
can be:
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Sensors and switches that are directly connected to the BCM
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Class 2 serial data messages received from other vehicle systems connected to the class 2 serial data link
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GMLAN serial data messages received from other vehicles systems connected to the high speed GMLAN serial data link
The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific
messages on the class 2 serial data link or high speed GMLAN serial data link. The system capable of performing the required function will respond to
the BCM messages.
Some of the other system functions that BCM controls or contributes to are:
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Audible warnings-Refer to Audible Warnings Description and Operation in Instrument Panel, Gages, and Console.
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Exterior lighting control-Refer to Exterior Lighting Systems Description and Operation in Lighting Systems.
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Interior lighting-Refer to Interior Lighting Systems Description and Operation in Lighting Systems.
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Automatic door locks-Refer to Power Door Locks Description and Operation in Doors.
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Keyless entry-Refer to Keyless Entry System Description and Operation in Keyless Entry.
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Theft deterrent-Refer to Content Theft Deterrent (CTD) Description and Operation in Theft Deterrent.
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Wipers/washers-Refer to Wiper/Washer System Description and Operation in Wipers/Washer Systems.
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Rear defogger-Refer to Rear Window Defogger Description and Operation in Heated Glass Element.
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Horn-Refer to Horns System Description and Operation in Horns.
POWER MODE
The BCM is the power mode master (PMM). Refer to Power Mode Description and Operation for more information.
