Principles of Operation
PRINCIPLES OF OPERATIONWhen the headlamp switch is in the parking lamps or headlamps ON position, synchronized dimming of the backlights and displays occur with the instrument panel dimmer switch.
The instrument panel dimmer switch allows the brightness level of the dimmable backlights and displays to be adjusted.
Both the headlamp switch and the instrument panel dimmer switch communicate a signal to the smart junction box (SJB) which supplies voltage to the dimmable and non-dimmable backlights.
The SJB communicates with the instrument cluster through the controller are network (CAN). The instrument cluster then increases or decreases the intensity of the instrument cluster backlighting accordingly.
Fault Management
The dimmable backlighting defaults to full intensity if the instrument panel dimmer switch or circuitry fails.