Interior Lamps Dimming

The second group of lamps include lamps which may be dimmed. This group may use a combination of Vacuum Fluorescent (VF) illumination and incandescent lamps:
^ Ashtray lamp
^ Automatic transaxle control position indicator bulb
^ Fog lamp switch
^ Door switches and window switches
^ HVAC control head assembly
^ Outside remote control rear view mirror
^ Radio
^ Radio control switches
^ The Instrument Panel Cluster (IPC)
^ Heated seat switches
^ Electronic traction control switch

When the headlamp switch is placed in the PARK position, battery voltage is supplied through the headlamp switch to both the TAIL LAMP, LIC LAMPS fuse and the FRONT PARK fuse. Battery voltage is then applied through the TAIL LAMP LIC LAMPS fuse and the FRONT PARK fuse to the front and rear park lamps and the rear license lamps illuminating the park lamps.

Battery voltage is then applied thorough the rear park lamp fused circuit to the I/P dimming switch and the VF dimming components.

Incandescent Dimming
The incandescent lamps become illuminated when the park lamps are on. The brightness of all the incandescent lamps is determined by a variable voltage signal from the dimmer switch and sent through the instrument panel lamp supply voltage 1 circuit. The incandescent lamps are located in various components.

Vacuum Fluorescent (VF) Dimming
The vacuum florescent lamps will be at full brightness when the ignition is on and the park lamps are off. When the park lamps are turned on, voltage is supplied by the instrument panel lamp fuse supply voltage circuit to the VF display components. The VF display will then dim to the level set by the dimmer switch. The brightness of all the vacuum florescent displays is determined by a variable voltage signal produced by the dimmer switch and sent through the instrument panel lamp supply voltage 1 circuit. With the park lamps activated, the following components will dim for night time viewing:
^ The VF display of the radio
^ The HVAC module
^ The Instrument Cluster VF displays

When the instrument panel lamp fuse supply voltage is present, the VF display is at its high brightness for daytime viewing. When the park lamps are on, the VF displays receive two signals. The first from the instrument panel lamp fuse supply voltage circuit and the second from the instrument panel lamp supply voltage 1 circuit.