DESCRIPTION & OPERATION
| WARNING | Vehicles are equipped with air bag supplemental restraint system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article. |
| CAUTION | When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery. |
Body Control Module (BCM) controls the operation of various electrical units installed on the vehicle. Systems directly controlled by BCM
- Power door lock system.
- Remote keyless entry system.
- Power window system.
- Sunroof system.
- Room lamp timer.
- Key reminder.
- Warning chime.
- Turn signal and hazard warning lamps.
Systems controlled by BCM and IPDM E/R
- Headlight, tail lamp, fog lamp and autolight system.
- Wiper.
- Front washer.
- Rear window defogger.
For major components and control system, see
Scheme 1
Description
Controller Area Network (CAN) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN "H" line, CAN "L" line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.