Probably the switch input to the BCM is bad . door ajar switch .
The BCM is also capable of commanding other vehicle systems to control functions that are not directly wired to and/or controlled by the BCM. The BCM accomplishes this task by sending specific messages on the class 2 serial data link. The vehicle system capable of performing such function will respond to the BCM message.
The BCM controls/monitors the following functions:
ā¢ Audible warnings
ā¢ Indicators control
ā¢ Interior lighting
ā¢ Exterior lighting
ā¢ Power/automatic door locks
ā¢ Keyless entry
ā¢ Content theft deterrent
ā¢ Personalization
ā¢ Serial Power Modes
ā¢ Electrical Power Management
Audible Warning
The body control module (BCM) provides the following audible control functions. Some audible control functions may be controlled by other systems through the class 2 serial data link:
ā¢ Headlamp on reminder
ā¢ Key in ignition reminder
ā¢ Personalization mode
ā¢ Delay locking indication
ā¢ Keyless entry programming/diagnostic mode indication
Indicator Control
The body control module (BCM) provides the following indicator control functions through the class 2 serial data circuits. Some indicator control functions may be controlled by other systems through the class 2 serial data link:
ā¢ Door ajar
ā¢ Liftglass/endgate ajar
ā¢ Park brake
ā¢ High beam
ā¢ Park lamp malfunction
ā¢ Service vehicle soon
ā¢ Personalization mode
ā¢ Security LED
ā¢ Battery
Door Locks Go Crazy 1
Door Locks Go Crazy 2
Door Locks Go Crazy 3
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