Interior Lamps Dimming

The third group includes lamps which may be dimmed. This group may use a combination of Vacuum Fluorescent (VF) illumination and of incandescent lamps.
^ Door switches and the front window switches
^ Driver information center
^ Head-Up Display (HUD)
^ Heated seat switches
^ Headlamp switch
^ HVAC control head assembles
^ Radio
^ Instrument Panel Cluster (IPC)
^ Steering wheel control switches

When the ignition switch is turned to the ON position, the vacuum fluorescent (VF) displays turn on at maximum brightness. When the park lamps are on and the ambient light sensor indicates low light conditions, all incandescent backlighting turn on at the dimming level indicated by the IP dimmer switch. At the same time all vacuum fluorescent (VF) displays dim to match the indicated dimming level. The Lamp Control Module (LCM) supplies battery positive voltage to the panel dimming module. With the park lamps on, the panel dimming module sends proportional voltage to the instrument panel lamp supply voltage - 1 circuit in response to an input from the potentiometer of the IP dimmer switch. The potentiometer is an input to the panel dimming module. All vacuum fluorescent (VF) lamps and all incandescent backlighting lamps have voltage and ground at G201 and at G202. When the IP dimmer switch is moved from minimum to maximum, all vacuum fluorescent (VF) displays, as well as all incandescent backlighting responds from minimum intensity to maximum brightness in response to the IP dimmer switch.