Circuit Description

CIRCUIT OPERATION
The IP dimmer switch controls the brightness of the following components.
^ The incandescent illumination lamps of the instrument cluster.
^ The vacuum fluorescent (VF) displays of the radio.

Incandescent Dimming
When the headlamp switch is in the PARK position or the HEAD position or the vehicle is in a low light condition with DRL active, voltage is applied through circuit 9 to the IP dimmer switch. Voltage from the IP dimmer switch is applied through circuit 44, the IP dimmer fuse and circuit 8 to the incandescent lamps. Turning the IP dimmer switch changes the voltage on circuit 8 which varies the intensity of the lamps.

Vacuum Fluorescent Dimming
When the headlamp switch is in the PARK position or the HEAD position or the vehicle is in a low light condition with DRL active, voltage is applied through circuit 9 to the IP dimmer switch. Voltage from the IP dimmer switch is applied through circuit 44, the IP dimmer fuse and circuit 8 to the radio VF display. The radio VF display dims for night viewing. Turning the IP dimmer switch changes the voltage on circuit 8 which varies the intensity of the radio VF display.