The interior lighting consist of lamps that may not be dimmed (Interior Lamps) and lamps that may be dimmed (Interior Lamps Dimming).

Interior Lamps

The first group of lamps are the interior lamps these includes the lamps that may not be dimmed manually:

Interior Lamps Features

The interior lamps system features the following functions:

Courtesy/Illuminated Entry Lamps

When the body control module (BCM) is in an active state (awake) it energizes the courtesy lamps supply voltage circuit. The courtesy lamps supply voltage circuit supplies voltage to all of the interior lamps, including the illuminated entry lamps (courtesy lamps). The illuminated entry lamps are turned on when they receive a ground from the courtesy lamp low control circuit of the BCM. When the ignition is in the LOCK position the BCM will ground the courtesy lamp low control circuit under the following conditions:

When the courtesy lamps supply voltage circuit and the courtesy lamp low control circuit are active the courtesy/illuminated entry lamps will illuminate. The courtesy lamps/illuminated entry lamps include the following interior lamps :

When the driver uses the remote function actuator transmitter to unlock the doors, the BCM will illuminate the courtesy lamps for approximately 40 seconds, unless another BCM function causes the lamps to remain active. If the ignition switch is turned to either the RUN or START position the courtesy lamps will turn off immediately.

When the door latch switch signal circuit is active with the ignition in the OFF position the BCM will illuminate the courtesy lamps. The courtesy lamps will remain illuminated for approximately 25 seconds, after the door latch switch signal circuit becomes inactive, unless another BCM function causes the lamps to remain active. If the ignition switch is turned to either the RUN or START position the courtesy lamps will turn off immediately.

Courtesy/Illuminated Exit

The illuminated exit feature will activate the courtesy lamps when the key IN input of the BCM transitions from an active state to an inactive state (removing the ignition key). When the key is removed from the ignition, the key IN input to the BCM becomes inactive. The BCM will illuminate the courtesy lamps for approximately 25 seconds, unless another BCM function causes the lamps to remain active.

Inadvertent Power Feature

Inadvertent power feature provides a similar function for the interior lamps as a retained accessory power feature. The BCM will energize the courtesy lamps supply voltage circuit when the BCM is in the active state (awake). When the courtesy lamps supply voltage circuit is energized, it supplies voltage to all the interior lights. The BCM will continue to supply voltage to the interior lamps after the ignition is turned OFF so that the interior lamps may be operated.

The inadvertent power feature will also act as battery run down protection by deactivate the courtesy lamps supply voltage circuit after 20 minutes once the BCM becomes inactive (ignition OFF and no BCM input activity.)

Theater Dimming

The theatre dimming feature that will slowly dim the interior lamps from full brightness to off. The following actions will over ride the theatre dimming feature causing the courtesy lamps to deactivate immediately if no other BCM function commands the courtesy lamps on:

Courtesy Lamps Manual Operation

The courtesy lamps, may be manually operated by the I/P dimmer switch. When the I/P dimmer switch is placed in the ON position the BCM receives a ground from the courtesy lamp switch signal circuit. Upon receiving the courtesy lamp switch signal the BCM then pulls low the courtesy lamp low control output circuit, which illuminates the courtesy lamps. The voltage for all interior lamps is supplied by the courtesy lamp supply voltage circuit of the BCM, whenever the BCM is active. The interior lamp switch will override any BCM operation of the interior lamps, such as entry illumination.

Dome Lamp

The dome lamp is turned ON by the I/P dimmer switch or during illuminated entry.

During illuminated entry or when the I/P dimmer switch is ON the BCM wakes up and then energizes the courtesy lamps supply voltage circuit, suppling voltage to all interior lamps. The BCM pulls the courtesy lamps low control circuit low, providing ground to the dome lamp and all courtesy lamps.

I/P Compartment Lamp

When the I/P compartment is opened the I/P compartment lamp illuminates, if the courtesy lamps supply voltage circuit of the BCM is activated (BCM awake).

The I/P compartment lamp illuminates when the courtesy lamps supply circuit of the BCM supplies voltage to the I/P compartment lamp and the I/P compartment switch closes, providing a ground path.

I/P Courtesy Lamp

The I/P courtesy lamp is turned ON by the I/P dimmer switch or during illuminated entry.

During illuminated entry or when the I/P dimmer switch is ON the BCM wakes up and then energizes the courtesy lamps supply voltage circuit, suppling voltage to all interior lamps. The BCM pulls the courtesy lamp low control circuit low, providing ground to the I/P courtesy lamps and all courtesy lamps.

Inside Rear View Mirror Lamp

The inside rear view mirror lamp is turned ON by the I/P dimmer switch, the inside rear view mirror switch, or during illuminated entry.

During illuminated entry or when the I/P dimmer switch is ON the BCM wakes up and then energizes the courtesy lamps supply voltage circuit, suppling voltage to all interior lamps. The BCM pulls the courtesy lamp low control circuit low, providing ground to the inside rear view mirror lamp and all courtesy lamps.

The inside rear view mirror lamp can be turned on from the inside rear view mirror switch. The BCM supplies voltage through the courtesy lamps supply voltage circuit when the BCM is awake. Manually turning on the inside rear view mirror switch provides a ground path.

Rear Compartment Lamp

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.

Roof Rail Courtesy Lamps

The roof rail courtesy lamps are turned ON by the I/P dimmer switch, the individual roof rail courtesy lamp switch, or during illuminated entry.

During illuminated entry or when the I/P dimmer switch is ON the BCM wakes up and then energizes the courtesy lamps supply voltage circuit, suppling voltage to all interior lamps. The BCM pulls the courtesy lamp low control circuit low, providing ground to the roof rail courtesy lamps and all courtesy lamps.

The roof rail courtesy lamps can be turned on from the individual roof rail courtesy lamp switch. The BCM supplies voltage through the courtesy lamps supply voltage circuit when the BCM is awake. Manually turning on the roof rail courtesy lamp switch provides a ground path.

Sunshade Mirror Lamps

When the vanity mirror cover on the sunshade is opened, the sunshade mirror lamp illuminates.

The sunshade mirror lamps receive voltage from the courtesy lamps supply voltage circuit anytime the BCM is awake. The sunshade illuminated mirror lamps receive ground from their individual switches when the sunshade is open.

Underhood Compartment Lamp

When the underhood compartment is opened the underhood compartment lamp illuminates, if the courtesy lamps supply voltage circuit of the BCM is activated (BCM awake).

The underhood compartment lamp illuminates when the courtesy lamps supply circuit of the BCM supplies voltage to the underhood compartment lamp and the underhood compartment switch closes, providing a ground path.

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

When the headlamp switch is placed in the PARK position, battery voltage is supplied through the headlamp switch to both the TAIL LAMP, LIC LAMPS fuse and the FRONT PARK fuse. Battery voltage is then applied through the TAIL LAMP, LIC LAMPS fuse to the PANEL DIMMING fuse . From the PANEL DIMMING fuse, voltage is then applied to the I/P dimming switch. Voltage is then applied to all the dimmable lamps.

Incandescent Dimming

The incandescent lamps become illuminated when the park lamps are on. The brightness of all the incandescent lamps is determined by a variable voltage signal from the dimmer switch and sent through the instrument panel lamp supply voltage 1 circuit. The incandescent lamps are located in various components (see schematics).

Vacuum Fluorescent (VF) Dimming

The vacuum florescent lamps will be at full brightness when the ignition is on and the park lamps are OFF. When the park lamps are turned ON, voltage is supplied by the instrument panel lamp fuse supply voltage circuit to the VF display components. The VF display will then dim to the level set by the dimmer switch. The brightness of all the vacuum florescent displays is determined by a variable voltage signal produced by the dimmer switch and sent through the I/P lamp supply voltage 1 circuit. With the park lamps activated , the following components will dim for night time viewing:

When the instrument panel lamp fuse supply voltage is present, the VF display is at its high brightness for daytime viewing. When the park lamps are on, the VF displays receive two signals. The first from the instrument panel lamp fuse supply voltage circuit and the second from the instrument panel lamp supply voltage 1 circuit.

Driver Controls and Modules

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

Driver controls include the following components: