The body control module (BCM) has a bussed electrical center integrated into the housing. Body control relays and fuses are installed directly on the BCM, which simplifies wiring and junction blocks on the vehicle. The body control system consists of the BCM and its associated controls. Battery positive voltage is provided to the BCM from IBCM BATT 1 fuse and the IBCM BATT 2 fuse in the underhood fuse block. The module grounds are wired to ground G201, G203 and G305. The BCM is wired to the GMLAN High speed serial data buss, and the GMLAN Low speed serial data buss, as well as discrete input and output terminals to control the functions of the vehicle's body .
Serial Data Gateway
The body control module (BCM) in this vehicle functions as a translator between the High and Low speed GMLAN busses. The 2 communication protocols use the BCM to translate communicated serial data messages between the control modules over the 2 serial data busses.
Power Mode Master
This vehicles body control module (BCM) fuctions as the power mode master (PMM). Refer to Power Mode Description and Operation for a complete description of power mode functions.
Body Control Module
The various body control module (BCM) input and output circuits are described in the corresponding functional areas indicated on the BCM electrical schematics. The BCM functions include the following:
| • | A/C compressor request--Refer to Air Temperature Description and Operation in HVAC Systems - Manual. |
| • | A/C cooling fan--Refer to Air Delivery Description and Operation in HVAC Systems - Manual. |
| • | Battery rundown protection (inadvertent power)--Refer to Interior Lighting Systems Description and Operation in Lighting Systems. |
| • | Bulb check--Refer to Instrument Cluster Description and Operation in Instrument Panel, Gages, and Console. |
| • | Chimes--Refer to Indicator/Warning Message Description and Operation in Instrument Panel, Gages, and Console. |
| - | Check gages |
| - | Door ajar warning |
| - | Headlamps ON |
| - | Key-in-ignition |
| - | Oil reset |
| - | Park brake warning |
| - | Seat belt not fastened |
| - | Turn signal ON |
| • | Door lock interface--Refer to Power Door Locks Description and Operation in Doors. |
| • | Electronic power steering (EPS)--Refer to Power Steering System Description and Operation in Power Steering System. |
| • | Engine coolant level sensing--Refer to Cooling System Description and Operation in Engine Cooling. |
| • | Exterior and interior lighting control--Refer to Exterior Lighting Systems Description and Operation in Lighting Systems. |
| - | Automatic lighting control |
| - | Daytime running lamps (DRL) |
| - | Fog lamps |
| - | Park brake lights |
| - | Turn hazard lamps |
| • | Gage control--Refer to Instrument Cluster Description and Operation in Instrument Panel, Gages, and Console. |
| • | Horn interface--Refer to Horns System Description and Operation in Horns. |
| • | Instrument cluster indicator control--Refer to Instrument Cluster Description and Operation in Instrument Panel, Gages, and Console. |
| • | Interior lighting--Refer to Interior Lighting Systems Description and Operation in Lighting Systems. |
| • | Key-in-ignition sensing--Refer to Indicator/Warning Message Description and Operation in Instrument Panel, Gages, and Console. |
| • | Parking brake state sensing--Refer to Brake Warning System Description and Operation in Hydraulic Brakes. |
| • | Retained accessory power (RAP)--Refer to Retained Accessory Power (RAP) Description and Operation . |
| • | Rear compartment interface--Refer to Power Door Locks Description and Operation in Doors. |
| • | Rear defogger--Refer to Rear Window Defogger Description and Operation in Stationary Windows. |
| • | Remote function control--Refer to Keyless Entry System Description and Operation in Keyless Entry. |
| • | Seat belt use sensing--Refer to Seat Belt System Description and Operation in Seat Belts. |
| • | Content theft deterrent--Refer to Theft Systems Description and Operation in Theft Deterrent. |
| • | Vehicle theft deterrent--Refer to Vehicle Theft Deterrent (VTD) Description and Operation in Theft Deterrent. |
| • | Washer solvent level sensing--Refer to Wiper/Washer System Description and Operation in Wipers/Washer Systems. |
| • | Wiper/washer--Refer to Wiper/Washer System Description and Operation in Wipers/Washer Systems. |
