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 Door switches and the window switches
^ The HVAC control head assembly
^ The Radio
^ The Instrument Panel Cluster (IPC)

When the ignition switch is turned to the ON position, the Vacuum Fluorescent (VF) displays, the radio and HVAC control assembly, and the 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. The RH I/P fuse block supplies battery positive voltage both to the normally-open park lamp relay switch contacts and to the park lamp relay coil. When the BCM energizes the park lamp relay, current flows from the park lamp switch contacts through the REAR PARK LP fuse to the IP dimming switch. When you select 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 G201, G203 and G302. When you move the IP dimmer switch from MIN to MAX, all vacuum fluorescent (VF) displays and all incandescent back lighting respond from minimum intensity to maximum brightness.

You 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, the radio and the HVAC assembly for a park lamp on input, and the displays will become full bright.