The body control module (BCM) controls the interior illumination of the vehicle.

One of the following 3 BCM types is installed on the vehicle based upon the vehicle equipment:

For more information regarding the BCM, refer to Body Control System.

The BCM activates the interior courtesy lights when the interior lamps override switch is in the ON position (interior courtesy lights enabled).

Additionally, the BCM activates the interior courtesy lights under the following conditions:

The BCM deactivates the interior courtesy lights when all of the doors are closed and the IP dimmer switch is in the OFF position.

All of the vehicle doors contain a door lock ajar switch. When the driver door is open, the left front door lock ajar switch closes, sending a ground signal to the BCM through CKT 159. When the right front or the rear liftgate door is open, its corresponding door lock ajar switch closes, sending a ground signal to the BCM through CKT 49. When a sliding door is open, its corresponding door jamb switch closes, sending a ground signal to the BCM through CKT 54.

The BCM grounds CKT 690 when detecting a ground signal in the following circuits:

When the driver door is closed, the left front door lock ajar switch opens CKT 159. When the right front door and the rear liftgate door are closed, their corresponding door lock ajar switches open CKT 49. When the sliding doors are closed, their corresponding door jamb switches open CKT 54.

The BCM then opens CKT 690 when the following circuits are open:

The BCM uses the voltage in CKT 240 in order to power the interior lights through CKT 328 and CKT 1393. The BCM controls the power supplied in CKT 328 and CKT 1393 for inadvertent load (battery rundown) protection. The BCM opens CKT 690 when the inadvertent load (battery rundown) protection is active (CKT 328 and CKT 1393 are open).

The BCM grounds CKT 690 for 22-28 seconds, activating the interior courtesy lights when the following conditions are met:

The delayed illumination feature will cancel when any of the following conditions are met:

The BCM grounds CKT 690 for 22-28 seconds, activating the interior courtesy lights when the following conditions are met:

The exit illumination will cancel when the following conditions occur:

Perform the following procedure to change the interior lighting mode:

1. Turn OFF the I/P dimmer switch.
2. Turn the ignition switch to the LOCK position.
3. Remove the BCM PRGRM fuse.
4. Turn the ignition switch to the ACC position.

•	The BCM sounds the chime a number of times equivalent to the BCM type installed on the vehicle (1,2,3 or 4 chimes).

•	Now the BCM has entered the feature customization mode.

5. To advance the interior lighting mode, cycle the I/P dimmer switch from OFF to DOME and back to OFF.

The BCM sounds the chime a number of times equivalent to the lighting mode currently set. A transition past mode 4 repeats the sequence starting with mode 1.

To exit and save the current customization mode:

1. Turn the ignition switch to the LOCK position.
2. Reinstall the BCM PRGRM fuse.

The BCM dims the interior courtesy lights slowly from a full brightness to the OFF position in 3 seconds. This feature starts anytime the BCM is turning off the interior courtesy lights.

Theater dimming does not work when turning the IP dimmer switch from the DOME position to the OFF position or when the illumination feature is cancelled by locking the doors with a power door lock switch. Also, theater dimming does not work when the exit illumination feature is disabled.

The BCM grounds CKT 690 for 36-44 seconds, activates the interior courtesy lights when the following conditions are met:

The BCM has a feature called inadvertent load (battery rundown) protection. The BCM de-energizes CKT 328 and CKT 1398 9-11 minutes after the ignition switch has been turned from the ACC or the RUN position to the LOCK or the OFF position.

The BCM restores power to CKT 328 and CKT 1393 when the interior lamps override switch is activated (interior courtesy lights enabled) and under the following conditions:

The inadvertent battery power rundown protection feature is mileage-sensitive. Vehicles with less than 15 (24 km) total accumulated miles (km) have a 2 minute and 32 second - 3 minute and 18 second time-out instead of a 10 minute time-out.

The BCM monitors the vehicle speed input to determine the total distance traveled in order to change the inadvertent battery rundown protection timer.

The BCM determines the distance traveled by interfacing with the vehicle speed CKT 389 which makes a ground transition 4000 times per 1.6 km (1 mile) traveled. Once the vehicle has been driven past the 15 mile (24 km) mark, the BCM changes inadvertent battery power rundown protection timer from 3 minutes to 10 minutes.

In addition, the BCM uses the vehicle speed CKT 389 for the operation of the turn signal reminder.

If the inadvertent battery power rundown protection stays at 3 minutes on vehicles with more than 15 miles (24 km), refer to Audible Warnings for possible malfunction of the turn signal reminder.

These lamps have switches that allow the operator to activate them. The switches, upon activation, provide ground to these lamps turning them to the ON position. The switches obtain ground through CKT 650. The BCM does not turn on these lamps with the rest of the interior courtesy lights. Power to the roof rail reading lamps is provided by the BCM through CKT 328, so that they are protected by the inadvertent load (battery rundown) protection in case they are left in the ON position.

The operation of these lamps is described as part of the interior courtesy lights operation. The BCM provides power (CKT 328) and ground (CKT 690) to these lamps, controlling their operation.

In addition, these lamps have switches that allow the operator to turn them on when the interior courtesy lights are off. The switches, upon activation, provide ground to these lamps turning them to the ON position. The switches obtain ground through CKT 650. Power to these lamps is provided by the BCM through CKT 328, so that they are protected by the inadvertent load (battery rundown) protection in case they are left in the ON position.

The operation of these lamps is described as part of the interior courtesy lights operation. The BCM provides power (CKT 328) and ground (CKT 690) to these lamps controlling their operation.

The operation of these lamps is described as part of the interior courtesy lights operation. The BCM provides power (CKT 328) and ground (CKT 690) to these lamps, controlling their operation.

In addition, these lamps have switches that allow the operator to turn them on when the interior courtesy lights are off. The switches, upon activation, provide ground to these lamps turning them to the ON position. The switches obtain ground through CKT 650. Power to these lamps is provided by the BCM through CKT 328, so that they are protected by the inadvertent load (battery rundown) protection in case they are left in the ON position.

The IP dimmer switch allows the operator to activate the interior courtesy lights from inside the vehicle. When the IP dimmer switch is in the DOME position, the switch sends a ground signal to the BCM through CKT 156. This action causes the BCM to activate the interior courtesy lights. When the IP dimmer switch is in the OFF position, the BCM deactivates the interior courtesy lights. With the ignition switch in the LOCK or OFF position, the IP dimmer switch is protected by the inadvertent load (battery rundown) protection in case the IP dimmer switch is left in the DOME position.

The IP dimmer switch is also used to change the interior lighting modes during the feature customization. Refer to Feature Customization for more information. In addition, the IP dimmer switch is also utilized to enter the input/output test during BCM diagnostics.

The sunshade illuminated vanity mirror lamps activate when the mirror cover is open. The sunshade illuminated vanity mirror has a switch that closes (providing ground to the lamps) when the mirror cover is open, and the switch opens when the cover is closed. The switch receives ground through CKT 650.

Power to the sunshade illuminated vanity mirror is provided by the BCM through CKT 328, so that they are protected by the inadvertent load (battery rundown) protection in case that a mirror cover is left open.

The IP compartment lamp activates when the IP compartment is open. The IP compartment lamp has a switch that closes (providing ground to the lamp) when the IP compartment is open. The IP compartment lamp switch opens when the IP compartment is closed. The IP compartment lamp switch receives voltage through CKT 328 and ground through CKT 150. The IP compartment lamp is protected by the inadvertent load (battery rundown) protection in case that the IP compartment is left open.

The interior lamps override switch is located in the overhead console switchbank. Pressing the symbol on the bottom of the rocker switch overrides the control of the interior lights. This action interrupts the voltage supply from CKT 1393 to CKT 328, deactivating all of the interior lights.

The brightness of the interior lights is changed by adjusting the position of the IP dimmer switch thumbwheel on the headlamp and IP dimming switch. The headlamp and IP dimming switch provides a variable voltage to the incandescent lamps circuit . The incandescent dimming lamps are grounded at all times and respond directly to the voltage and are therefore capable of producing variable levels of illumination. The headlamp and IP dimming switch also controls the radio and the driver information center dimming by suppling a variable voltage to the DC Dim circuit and to the Step Dim circuit of the radio and driver information center .