Interior Illumination Control

The Body Control Module (BCM) turns on the courtesy lights when:
^ Any vehicle door is opened.
^ The IP dimmer switch is in the DOME position.
^ When the exit illumination feature is active.
^ When unlocking the doors using the keyless entry transmitter (BCM types 3 and 4 only.)
^ When unlocking a door using a door cylinder lock (BCM type 4 only.)

The BCM turns off the courtesy lights when all doors are closed and the IP 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 159. When one of the RF, LR or RR door is open, its corresponding door lock ajar switch closes and sends a ground signal to the BCM through circuit 49. The BCM grounds circuit 690 when detecting a ground signal in either circuit 49 or 159.

When the driver's door is closed, the LR door lock ajar switch opens circuit 159. When the RF, LR and RR doors are closed, their corresponding door lock ajar switches open circuit 49. The BCM then opens circuit 690 when either circuit 49 or 159 is open.

The BCM uses the voltage in circuit 240 to power the courtesy lights through circuit 1393. The BCM controls the power supplied in circuit 1393 for inadvertent load (battery rundown) protection. The BCM opens circuit 690 when the inadvertent load (battery rundown) protection is active (circuit 1393 is open.)