Interior Lamps Dimming

WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

The second group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination and incandescent lamps.

Door switches and window switches
HVAC control head assembly
Radio
The instrument panel cluster (IPC)
Other interior controls and switches

When the ignition switch is turned to the ON position, the radio's vacuum fluorescent (VF) displays turn on at maximum brightness. When the park lamps are on, 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 through the PARK LPS 20 A fuse 9 in the IP fuse block to the switch. The panel dimmer switch potentiometer receives its voltage from the headlamp switch. When the driver selects a dimming setting by moving the IP dimming switch potentiometer, the ILLUMN 10 A fuse 14 in the IP fuse block receives a specific voltage. All incandescent back lighting lamps are then provided with the same specific voltage from the ILLUMN 10 A fuse 14 in the IP fuse block. The interior dimming lamps are then grounded at G201, G101, and G400. 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 the IP dimmer switch in the parade mode. The LED dimming signal circuit supplies voltage to the instrument panel cluster and radio for a park lamp on input, and the displays will become full bright.