Panel Dimming Illumination

PANEL DIMMING ILLUMINATION
The Instrument Cluster contains 5 (five) illumination bulbs that are hardwired to the cluster. Illumination and dimming is accomplished when the cluster senses voltage at the Headlamp Switch Output from the Park Lamp Feed circuit of the Multi-Function Switch. The cluster then applies voltage to ground on the Panel Lamps Dimmer Signal circuit through the Multi-Function Switch. The cluster interprets the resulting voltage drop through the Multi-Function Switch dimming rheostat to supply a dimmed voltage output to the illumination bulbs and other components on the Panel Lamps Feed circuit. The cluster and component bulbs are permanently grounded so the bulbs illuminate with the Panel Lamps Feed voltage. The cluster illumination bulbs are replaceable.

Panel Dimming Fault
If the cluster detects a panel dimming resistance greater than 9250 ohms for 5 (five) seconds, the Panel Dimmer Switch is considered open and the cluster will set a DTC.
During an open circuit condition, the cluster VF display will default to full brightness and general panel dimming will default to full brightness with the headlamps on.

Radio Illumination
The cluster provides an output to switch a 12-volt signal to control the radio display illumination.
Radio dimming will follow the Headlamp switch except when in the Parade mode or Dome Lamp on positions.
When in the Parade mode or Dome Lamp on positions, the cluster interrupts the switched 12-volt signal to the radio. This allows the radio display to remain bright.

Dimmable Indicators
The cluster provides a one-step dimming for the Cruise, Upshift, and Part Time indicators.
When the headlamps are on, these indicators will be dimmed at 60% (sixty percent).
When the headlamps are off, the indicators will be maximum brightness.