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.
^ Door switches and window switches
^ ETS off switch
^ Fog lamp switch
^ HVAC control head assembly
^ Hazard switch
^ Power sunroof switch assembly
^ Radio
^ Rear compartment lid release switch
^ Steering wheel controls
^ The Instrument Panel Cluster (IPC)

When the ignition switch is turned to the ON position, the Vacuum Fluorescent (VF) displays (radio) 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 PARK LPS fuse in the underhood junction block supplies battery positive voltage to the coil side and switch side of the auto park lamp control relay. With the headlamp switch in the PARK position, battery positive voltage is supplied to the park lamp switch ON input circuit of the Body Control Module (BCM). The BCM then supplies ground to the control circuit of the auto park lamp control relay. The auto park lamp control relay is energized and current flows from the auto park lamp control relay to the Instrument Panel (IP) dimmer switch and to the lamp dimmer module. The dimmer module supplies a proportional voltage to the interior lamps in response to the setting of the IP dimmer switch. All the vacuum florescent (VF) and incandescent back lighting lamps are provided a specific voltage and are then grounded. Ground is provided at G201, G202, G203, G301, and G302. When the headlight switch is turned to the PARK or HEADLAMP position, all incandescent back lighting turn on at the dimming level indicated by the IP dimmer switch. 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.