Interior Lamps Dimming

INCANDESCENT LAMPS
When the park lamps are on, battery positive voltage (B+) is applied to the park lamp input in the panel dimming module. The dimming switch on the headlamp switch varies in resistance as the dimming switch is operated. The panel dimming module receives a variable input voltage based on the resistance of the dimming control. The panel dimming module supplies a variable voltage via CKT 8 (GRY) to the incandescent lamps that is proportional to the voltage input from the dimming switch. As the voltage level increases, the lamps become brighter. As the voltage level decreases, the lamps become dimmer.

VF DISPLAYS
The radio, the heater and A/C programmer, the instrument cluster, and the Head-up Display (HUD)) (with UV6) each has a VF display. When each module receives an ignition in RUN input, the module will activate its VF display at full intensity. When the park lamps are on and nighttime conditions are sensed, the Lamp Control Module (LCM) supplies a dim enable signal to the radio, the instrument cluster, and the HUD. When these modules receive the dim enable input, each then dims its VF display to the current dimming level The radio and instrument cluster receive dimming level via CKT 8 (GRY). The HUD has a separate dimming control on the HUD switch in the overhead console. The dimming level is received by the HUD via CKT 622 (BRN). The heater and A/C programmer receives the enable and dimming level inputs from the radio via CKT 724 (PPL/WHT).