The Body Control Module (BCM) controls the operation of various electrical units installed on the vehicle. As I always recommend with computer controlled cars, have the computer memory checked for Diagnostic Trouble Codes first, before spending a lot of time checking or replacing parts.
SYSTEMS CONTROLLED BY BCM DIRECTLY
Power door lock system.
Remote keyless entry system.
Power window system.
Room lamp timer.
Turn signal and hazard warning lamps
NOTE: Power supply only. No system control.
SYSTEMS CONTROLLED INDIRECTLY BY BCM
Headlamp, tail lamp, fog lamp, auto light system
Rear window defogger