Interior Illumination Control

The Body Control Module (BCM) controls the interior illumination. The BCM turns on the roof rail courtesy/reading lamps and the inside rear view mirror lamps when:
^ Any vehicle door is opened.
^ The I/P lamp dimmer switch is in the DOME position.
^ During exit illumination or delayed illumination.
^ Lifting either LF or RF exterior door handle.
^ When unlocking the doors using the keyless entry transmitter.

The BCM turns off the lamps when all doors are closed and the I/P lamp dimmer switch is off. All vehicle doors contain a door lock ajar switch. When the driver's door is open, the LF door lock ajar switch closes and sends a ground signal to the BCM through circuit 49. When one of the LF, RF, LR or RR door is open, its corresponding door lock ajar switch closes and sends a ground signal to the BCM through circuit 727. The LF and RF door locks have a door handle switch. When either LF or RF exterior door handle is lifted, its corresponding door lock switch sends a ground signal to the BCM though circuit 394. The BCM grounds circuit 157 when detecting a ground signal in circuits 49, 394 or 727. When the driver's door is closed, the LF door lock ajar switch opens circuit 49. When the LF, RF, LR and RR doors are closed, their corresponding door lock ajar switches open circuit 727. When LF and RF door handles are released, circuit 394 opens. The BCM then opens circuit 157 when circuit 49, 394 and 727 are open.

The BCM uses the voltage in circuit 240 to power the courtesy lights through circuit 1732. The BCM controls the power supplied in circuit 1732 for inadvertent load (battery rundown) protection. The BCM open circuit 157 when the inadvertent load (battery rundown) protection is active