The interior lighting consist of two groups. This first group includes lamps that may not be dimmed.

The BCM turns on the courtesy lamps when the following conditions exist:

After all the doors have been closed the courtesy lamps will remain illuminated approximately 25 seconds after the last door closes. The courtesy lamps will also turn on prior to any door being opened, and remain illuminated approximately 25 seconds when the driver removes the ignition key. The BATT 1 fuse in the underhood junction block and the BCM POWER and INADVERTENT POWER fuses in the IP fuse block, supply battery positive voltage to the body control module (BCM).

The body control module (BCM) has a feature called the inadvertent load or battery rundown protection. The BCM de-energizes the interior lamp supply circuit 10-22 minutes after the ignition switch has been turned from the ACC or RUN position to the LOCK or OFF position. The inadvertent power control circuit of the BCM supplies battery positive voltage to all interior courtesy lamps. When any door is opened the door jamb switch contacts close and a door open input is received by the BCM. If a door lock or unlock input is received by the BCM, it will activate the inadvertent power relay providing battery positive voltage to all interior courtesy lamps. Some of the courtesy lamps may also be used as reading lamps by placing the lamps switch in the ON or OFF position.

The courtesy lamps will normally turn off using the theater dimming feature. The BCM provides a pulse width modulated ground to all courtesy/reading, dome and inside rear view mirror lamps for the theater dimming feature. The BCM will immediately turn off the courtesy lamps if a door lock command is received with all the doors closed, or if the ignition switch is turned to either the ON or RUN position.

When the driver uses the door key in order to unlock the doors, the body control module (BCM) receives a door unlock signal. The BCM must have inputs that indicate that the ignition switch is OFF, the courtesy lamp switch is OFF and all the doors are closed. The BCM will then activate the interior lamps. The courtesy lamps will remain on, approximately 25 seconds after the door is closed. The BCM will then turn them off through the theater dimming feature. If the door locks are activated to the LOCK position, or if the ignition switch is turned to either the RUN or CRANK position the courtesy lamps will turn off immediately.

When the driver uses the remote function actuator transmitter to unlock the doors, trunk or presses the panic button, the BCM will keep the courtesy lamps on approximately 25 seconds. If the door locks are activated to the UNLOCK or LOCK position, or if the ignition switch is turned to either the RUN or CRANK position the courtesy lamps will turn off immediately. The BCM will also keep the courtesy lamps on approximately 40 seconds, after an alarm event is completed.

The Body Control Module (BCM) also provides battery positive voltage to the instrument panel compartment lamp. When the IP compartment is opened, its switch closes to provide a ground circuit and the IP compartment lamp illuminates.

When the rear compartment is opened, the rear compartment lamp illuminates.

When the rear compartment is opened, the rear compartment courtesy lamp switch sends a ground signal to the BCM, waking the BCM. When the BCM wakes up it will then energize the courtesy lamps supply voltage circuit , suppling voltage to the rear compartment courtesy lamp. The rear compartment courtesy lamp switch will provide a ground path for the rear compartment courtesy lamp in order to illuminate the lamp.

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

When the ignition switch is turned to the ON position, the vacuum fluorescent (VF) displays (radio and HVAC control assembly), incandescent lamps, turn on at maximum brightness. When the position lamps are on and the ambient light sensor indicates low light conditions, all incandescent back lighting turn on at the dimming level indicated by the IP dimmer switch. At the same time all vacuum fluorescent (VF) displays dim to match the indicated dimming level. Battery positive voltage is supplied from the IP fuse panel to the headlamp switch. When the IP dimmer switch is moved from MIN to MAX, all vacuum fluorescent (VF) displays, as well as all incandescent back lighting respond from Minimum intensity to maximum brightness in response to the IP dimmer switch. When the driver selects a dimming setting, by moving the IP dimming switch potentiometer, all incandescent back lighting lamps are provided with a specific voltage. The incandescent back lighting lamps are then grounded at G200, G201 and G301. The vacuum fluorescent (VF) displays are grounded at G200, G201 and G203.

Driver controls include the following components.

Two modules process the inputs and the controls. The ambient light sensor supplies the body control module (BCM) with a signal for daytime conditions or for low light conditions.