The interior lamps consists of two groups, lamps that can not be dimmed and lamps that can be dimmed. This first group consists of lamps that may not be dimmed. This includes those lamps that may be manually turned on by placing the interior lamp switch to the DOME position, or by opening a door or a compartment:

Battery positive voltage is applied at all times to the INT LP fuse and to the coil side of the INT LAMP relay in the rear fuse block. The rear integration module (RIM) supplies a ground through the inadvertent power relay control circuit to the INT LAMP relay coil. This energizes the INT LAMP relay and applies battery positive voltage to splice pack SP310 and splice pack SP306. From SP310 battery positive voltage is applied to:

From SP306 battery positive voltage is applied to:

The RIM activates the interior lighting output 15 seconds after receiving the class 2 message "Airbags Deployed" from the sensing and diagnostic module (SDM). The interior lamps then remain activated for 25 minutes.

Interior Lamp Operation

The interior lamps can be turned on three different ways:

The courtesy lamps will normally turn off using the theater dimming feature. The RIM provides a ground to all courtesy/reading, dome, and inside rear view mirror lamps for the theater dimming feature. The RIM 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. The courtesy lamps will remain on for approximately 40 seconds after the last door is closed. The RIM keeps the courtesy lamps on for approximately 40 seconds after an alarm event is completed.

Headlamp Switch

When the headlamp switch is placed in the DOME position, the instrument panel module (IPM) receives a ground signal from the headlamp switch. The instrument panel module (IPM) then applies a signal message through the class 2 communication to the RIM. The RIM then applies a ground to the inadvertent power relay control circuit. This energizes the INT LAMP relay allowing battery positive voltage to be applied to all courtesy lamps. The RIM then applies a ground to the interior lamps ground control circuit to all the courtesy lamps, illuminating them.

Door Activated Courtesy Lamps

If the sunload sensor detects a low light condition, the IPM applies a class 2 message to the RIM indicating a low light level. When the LH front door is opened, the door lock actuator contacts close and the driver door module (DDM) receives a door-open signal. The DDM then applies a class 2 message to the RIM. When the RIM receives a door lock or unlock input signal, the RIM will activate the INT LAMP relay, which provides battery positive voltage to all interior courtesy lamps. The RIM then applies a ground to the interior lamp ground control circuit illuminating the all courtesy lamps. After all the doors are closed, the courtesy lamps remain illuminated for approximately 25 seconds. The courtesy lamps will also turn on and remain illuminated for approximately 15 seconds after the ignition key is removed, prior to any door being opened.

When a passenger door is opened and the RIM has received a low light message, the door lock actuator contacts close and the corresponding door module receives a door-open signal. The door module then communicates through the Simple Bus Interface (SBI) to the DDM. The DDM then applies a class 2 message to the RIM. When the RIM receives a door lock or unlock input signal, the RIM will activate the INT LAMP relay, which provides battery positive voltage to all interior courtesy lamps. The RIM then applies a ground to the interior lamp ground control circuit illuminating the all courtesy lamp.

Keyless Entry Interior Illumination

When the remote function actuation (RFA) module receives a door unlock command from the key FOB, the RFA module applies a class 2 message to the RIM. If the RIM has received a low light message from the IPM and the following conditions are met:

Then the RIM will activate the INT LAMP relay, which provides battery positive voltage to all interior courtesy lamps. The RIM then applies a ground to the interior lamp ground control circuit illuminating the all courtesy lamp.

I/P Compartment Lamp

The INT LAMP relay provides battery positive voltage to the I/P compartment lamp. When the I/P compartment is opened, a switch closes, providing a ground circuit to G201, and the I/P compartment lamp illuminates.

Reading Courtesy Lamps

The INT LAMP relay provides battery positive voltage to each of the reading courtesy lamps. When the switch is closed on the reading lamp, this provides a ground circuit to G402, and the reading lamp illuminates.

Rear Compartment Lamp

The INT LAMP relay provides battery positive voltage to the rear compartment lamp. When the rear compartment is opened, the rear compartment lid release actuator closes. Ground is applied from G401 through the rear compartment lid release actuator to the rear integration module (RIM). The RIM then applies a ground through the rear compartment lid release actuator to the rear compartment lamp courtesy lamp, and the rear compartment lamp illuminates.

Sunshade Vanity Lamps

The INT LAMP relay provides battery positive voltage to each of the vanity mirror lamps. When the vanity mirror cover on the sunshade is opened, a switch closes in the cover, providing a ground circuit to G402, illuminating the vanity mirror lamps.

This group of interior lighting includes lamps which may be dimmed. This group uses a combination of class 2 controlled illumination and incandescent lamps:

For the interior lighting to be dimmed the following conditions must be met:

Then all class 2 displays and all incandescent back lighting will be illuminated to the level set by the instrument panel (I/P) dimmer switch. When the I/P dimmer switch is moved from MIN to MAX, all class 2 displays and all incandescent back lighting respond from minimum intensity to maximum brightness.

The DIM supplies battery positive voltage to the coil side of the PRK LP relay in the rear fuse block.

When the I/P dimmer switch is moved from MIN to MAX, then the instrument panel module (IPM), W/CJ2, or climate control panel (CCP), W/C67, applies a message to the class 2 communication circuit to the DIM. The DIM then applies a ground to the park lamp relay control circuit. This energizes the PRK LAMP relay and allows battery positive voltage to be applied through the DIMR fuse to the DIM. The DIM then illuminates the following incandescent lamps through the incandescent dimming output circuit:

The DIM also applies a message to the following class 2 controlled illumination components:

The DDM will then send a message through the simple bus interface (SBI) to the RH front door module (RFDM). The door modules will then illuminate the following components through the incandescent dimming output circuit:

The ground for these components are provided from the DDM and RFDM.

The following components are grounded at G200:

The following components are grounded at G201:

Battery positive voltage is applied at all times to the INT LP fuse and to the coil side of the INT LAMP relay in the rear fuse block. The rear integration module (RIM) supplies a ground through the inadvertent power relay control circuit to the INT LAMP relay coil. This energizes the INT LAMP relay and applies battery positive voltage to all the interior lamps. This relay provides a parasitic load protection and the RIM will keep this relay active for 10 minutes following the ignition being turned to the OFF position and retained accessory power (RAP) being deactivated or timed out. The 10 minutes is reduced to 3 minutes if mileage of the vehicle is less then 22.5 km (14 mi).