The interior lighting consists of three groups:

The first group includes lamps that may not be dimmed by the I/P dimmer switch.

Courtesy/Illuminated Entry Lamps

The second group includes lamps that may be manually turned on by placing the courtesy lamp switch in the ON position, or by opening a door.

The courtesy lamps, may be manually turned on by placing the courtesy lamp switch in the ON position, or by opening a door. When the ambient light sensor indicates a low light condition, the following scenarios will occur. When a front door is opened, the I/P courtesy lamps, all of the door courtesy lamps, the courtesy/reading lamps and the office work lamp turn on. If a rear door is opened, only the courtesy/reading lamps illuminate. After all the doors have been closed the courtesy/reading lamps will remain illuminated approximately 25 seconds after the last door closes. When the ambient light sensor indicates daylight conditions, the interior courtesy lamps will not illuminate at all.

The standard body module (SBM) fuse in the fuse block -I/P supplies battery positive voltage to the body control module (BCM). The door modules communicate on a simple bus interface (SBI). When you open any door, the switch contacts of the door jamb switch close. When a door open switch signal circuit is grounded, that door module sends a message to the drivers door module (DDM) in order to indicate that a door is open. The DDM sends a class 2 message to the BCM in order to indicate which door is open. The BCM activates the courtesy lamps supply voltage output in order to provide battery positive voltage to the interior courtesy lamps. Depending on which doors are opened, front or rear, the proper interior courtesy lamps illuminate. The BCM provides a pulse width modulated ground to all interior courtesy lamps for the interior lights theater dimming feature. Some of the courtesy lamps are also used as reading lamps, each reading lamp may be manually turned on or off using its own respective switch.

The courtesy lamps will normally turn off using the theater dimming feature. The courtesy lamps will also turn off immediately if an all door lock command is received with all the doors closed, or if the ignition switch is turned to either the ON or RUN position.

Keyless Entry Interior Illumination

The BCM allows the remote control door lock receiver (RCDLR) to control the interior lighting through the auxiliary lighting control circuit. When the keyless entry transmitter is used for a remote lock or a remote unlock function, the RCDLR activates the auxiliary lighting input on the BCM. The BCM then activates the theatre dimming 1 and the theatre dimming 2 outputs for up to 15 seconds. After the 15 seconds, the BCM enters the delayed illumination mode for another 25 second period. A door open input will end the auxiliary lighting mode and the BCM begins the delayed illumination mode. If the ignition switch turns to RUN, the theatre dimming 1 and theatre dimming 2 outputs will be deactivated. The outputs also deactivate if the lock all doors switch activates. The BCM performs no other auxiliary lighting function until the input transitions from inactive to active.

I/P Compartment Lamp

The BCM activates the courtesy lamps supply voltage output in order to provide battery positive voltage to the I/P compartment lamp. When the I/P compartment is opened, the I/P compartment lamp switch closes to provide a ground circuit and the I/P compartment lamp illuminates.

Rear Compartment Lamp

The BCM activates the courtesy lamps supply voltage output in order to provide battery positive voltage to the rear compartment lamp. When the rear compartment is opened, its switch closes to provide a ground circuit and the rear compartment lamp illuminates.

Rear Door Window Switches

The rear door window switch backlighting is non-dimming, they are always bright. The LP PK L fuse in the fuse block - I/P supples voltage to the window switch - LR backlighting via the left park lamp supply voltage circuit and the LP PK R fuse in the fuse block - I/P supples voltage to the window switch - RR backlighting via the right park lamp supply voltage circuit when the park lamps are activated. The ground is provided by the power window switch low reference circuits.

Vanity Lamps

The BCM activates the courtesy lamps supply voltage output in order to provide battery positive voltage to the vanity mirror lamps. When the vanity mirror cover on the sunshade is opened, its switch closes to provide a ground circuit and the vanity lamp illuminates. The vanity mirror lamp may be dimmed by the sliding switch next to the mirror.

The third group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination and of incandescent lamps.

When the ignition switch is turned to the ON position, the VF displays turn on at maximum brightness. When the park lamps are on and the ambient light sensor indicates low light conditions, all incandescent backlighting turn on at the dimming level indicated by the I/P dimmer switch. At the same time all VF displays dim to match the indicated dimming level. The lamp control module (LCM) supplies battery positive voltage to the panel dimming module. With the park lamps on, the panel dimming module sends proportional voltage to the instrument panel lamp supply voltage circuit in response to an input from the potentiometer of the I/P dimmer switch. The potentiometer is an input to the panel dimming module. When the I/P dimmer switch is moved from minimum to maximum, all VF displays, as well as all incandescent backlighting responds from minimum intensity to maximum brightness in response to the I/P dimmer switch.

To provide battery run down protection the body control module (BCM) used in this vehicle controls the lighting system through circuits that enable the interior lamps. The BCM opens these enabling circuits 10 minutes after the ignition switch is turned OFF with no lamp switch activity. If the ignition switch is turned to any position other than OFF, or if a lamp switch is activated, during this 10-minute period the timer will reset for another 10 minutes.