Instrument Cluster and Panel Illumination

Instrument Cluster and Panel Illumination

The backlighting system consist of the following components:

Dimmable Components
- Instrument panel dimmer switch
- Headlamp switch
- Four-Wheel Drive (4WD) switch
- Audio Control Module (ACM)
- HVAC module
- Instrument Panel Cluster (IPC)
- Overhead console
- Passenger Air Bag Deactivation (PAD) indicator (center stack switch assembly)
- Steering wheel switches
- Trailer Brake Control (TBC) module
- Upfitter switches
- Steering Column Control Module (SCCM)
- Body Control Module (BCM)

Non-Dimmable Components
- Door lock control switches
- Window control switches

Dimmable Illumination

The dimmable illumination is used to provide backlighting to the IPC, switches, and control components when the parking lamps are on. The level of intensity is adjustable by pressing the instrument panel dimmer switch either up to increase intensity or down to decrease intensity.

The dimmable switches and components are illuminated when the parking lamps are ON. The instrument panel dimmer switch is a double detent rocker switch used to control all dimmable interior illuminated components, and to control the courtesy lamps. The first up detent increases dimmable backlighting intensity. The first down detent decreases dimmable backlighting intensity. The second up detent turns the courtesy lamps on. The second down detent turns the courtesy lamps off (allowing other features to control the courtesy lamps).

On vehicles equipped with autolamps, if the exterior lamps are activated during daytime sunload conditions, the message center illumination remains at full intensity and does not dim from the instrument panel dimmer switch during this condition. If the vehicle travels under a bridge or a tunnel, the low level of ambient light causes the illumination level of the message center to change to the level set by the instrument panel dimmer switch. The message center illumination changes back to full intensity when the intense ambient light is restored.

Non-Dimmable Illumination

The non-dimmable illumination is used to provide backlighting to the doorlock and window switches when the accessory delay relay is energized.