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 INT lamp 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).