Circuit/System Description

When the ignition switch is turned to the ON position, the vacuum fluorescent (VF) display, radio, turns ON at maximum brightness. When the park lamps are ON, all incandescent back lighting turn ON at the dimming level indicated by the indicated dimming level. When the headlamp switch is placed in the PARK position, the park lamp supplies voltage circuit provides an input to the body control module (BCM). The BCM then supplies voltage to the I/P dimming switch through the I/P dimming lamps control circuit. The setting of the I/P dimmer switch determines the amount of voltage that the I/P dimming switch supplies to the BCM through the I/P dimming lamps low reference circuit. The BCM than sends a pulse width modulation (PWM) voltage to all the interior lamps. All the VF the incandescent back lighting lamps are provided a specific voltage and are then grounded. When the I/P dimmer switch is moved from MIN to MAX all VF displays, as well as all incandescent back lighting responds from minimum intensity to maximum brightness in response to the I/P dimmer switch.