Interior Illumination Control

The BCM turns on the courtesy lights when the following actions occur:
^ Any of the vehicle doors are 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 of the doors are closed and the IP dimmer switch is OFF. All the vehicle doors contain a door lock ajar switch. When the drivers door is open, the left front door lock ajar switch closes and sends a ground signal to the BCM through circuit 159.

When 1 of the right front, left rear or right rear doors is open, the 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 circuit 159.

When the drivers door is closed, the left right door lock ajar switch opens circuit 159. When the right front, left rear and right rear doors are closed, the corresponding door lock ajar switches open circuit 49. The BCM then opens circuit 690 when both circuit 49 and circuit 159 are 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).