Interior Lamps Dimming

The second group includes lamps which may be dimmed. This group may use a combination of Vacuum Fluorescent (VF) illumination and of incandescent lamps:
^ The ashtray lamp
^ The automatic transaxle control position indicator
^ The door switches and the window switches
^ The driver seat heater switch
^ The Driver Information Center (DTC)
^ The fog lamp switch
^ The HVAC control head assembly
^ The Head Up Display (HUD) dimmer switch
^ The radio
^ The trip calculator
^ The Instrument Panel Cluster (IPC)
^ The steering wheel control switch

When the ignition switch is turned to the ON position, the vacuum fluorescent (VF) displays (radio and HVAC control assembly), incandescent lamps, turn on at maximum brightness. When the park lamps are on and the ambient light sensor indicates low light conditions, all incandescent back lighting 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. Battery positive voltage is supplied from the PARK LP fuse in the underhood fuse block to the headlamp switch.

When the headlamp switch is in the PARK or HEAD Position current flow is from IP lamps dimming control circuit in the headlamp switch. When the driver selects a dimming setting by moving, the IP dimming switch potentiometer, all incandescent back lighting lamps are provided with a specific Voltage. The incandescent back lighting lamps are then grounded at G200, G301 and G302. When the IP dimmer switch is moved from MIN to MAX, all vacuum fluorescent (VF) displays, as well as all incandescent back lighting respond from Minimum intensity to maximum brightness in response to the IP dimmer switch.

The driver may select parade mode by manually turning on the park lamps during daylight conditions. The front park lamp circuit supplies voltage to the instrument panel cluster, radio and HVAC assembly for a park lamp on input, and the displays will become full bright.