The body control system consists of a BCM and it's associated
controls. Battery positive voltage is provided to the BCM from BFC/BATT fuse
in the left hand Instrument panel fuse block. The module ground is wired
to ground G202. The BCM utilizes inputs Ignition 0, Ignition 1 and Ignition
3 to differentiate the power mode that the ignition switch has bean placed
in. The BCM is wired to the Class 2 serial data communication bus
as well as discreet input and output terminals to control the functions
of the vehicles body . The various BCM input and output circuits are described
in the corresponding functional areas indicated on the BCM electrical schematics.
The Body Control Module functions include the following.
| • | Serial Data Communications |
| - | Class 2 Serial Data Communications |
| - | Serial Peripheral Interface (SPI) |
| • | A/C compressor request |
| • | Remote Function Control |
| • | Exterior and interior lighting control |
| - | Daytime running lights (DRL) |
| - | Automatic lighting control |
| • | Battery rundown protection (Inadvertent Power) |
| • | Instrument cluster indicator control |
| • | Engine coolant level sensing |
| • | Washer solvent level sensing |
| • | Key-in-ignition sensing |
| • | Seat belt use sensing |
| • | Brake fluid level sensing |
| • | Parking brake state sensing |
| • | Rear compartment interface |
Data Line Communications
The BCM communicates on the following 2 separate data lines:
| • | Class 2 serial data comminutions |
| • | Serial peripheral interface (SPI). The BCM acts as the master
between the IPC . |
