Interior Lights Dimming Circuit Description

When the park lights are on, battery positive voltage (B+) is applied via CKT 32 (YEL) to the interior dimming switch in the headlamp switch. The interior dimming switch controls the amount of current applied to the incandescent lights. As the amount of current increases, the lamps become
brighter. As the amount of current decreases, the lamps become dimmer.

The following components each have a vacuum fluorescent (VF) display:
^ Radio, heater and A/C control assembly
^ Instrument cluster
^ Head-up display

When each module receives an input that the ignition switch is turned to the RUN position, each module activates the VF display at the full intensity. When the park lights are on, each module receives the dimming level from an input on CKT 8 (GRY). All modules with VF displays then adjust the dimming level of their VF display in order to match the level of the incandescent lamps.