Cluster Illumination

The EMIC has several illumination lamps that are illuminated when the exterior lighting is turned on with the headlamp switch circuitry of the left multifunction switch. The illumination brightness of these lamps is adjusted by the panel lamps dimmer rheostat when the control ring on the multifunction switch control stalk is rotated (downward to dim, upward to brighten). An analog/digital (A/D) converter in the EMIC converts the analog panel lamps dimmer rheostat input from the multifunction switch to a digital dimming level pulse-width modulated signal for controlling the lighting levels of the EMIC VFD and cluster illumination lamps. The EMIC also controls and synchronizes the radio and other instrument panel lighting levels through a hard wired panel lamp feed output circuit.