Circuit Operation

The radio receives battery voltage at all times on circuit 640 through the RADIO Fuse in the underhood electrical center to keep the clock and preset station memory alive when the ignition is OFF. With the ignition switch in ACCY or RUN, voltage is applied to circuit 43 through the MALL/RADIO/DIC Fuse in the Fuse Block to enable radio operation. The radio is grounded through circuit 351. When the ignition is in RUN or ACCY, the vacuum fluorescent display illuminates to display the time or Radio frequency setting.

The radio illumination is controlled by the instrument panel lamp dimmer. When the Headlamp and instrument panel lamp dimmer switch is in PARK or HEAD, voltage is applied through the dimmer control and circuit 230 to the radio panel lamp and the internal circuitry. When the Headlamp and instrument panel lamp dimmer switch is switched to PARK or HEAD, voltage is applied through circuit 308 to the Radio, signalling the internal circuitry to adjust the brightness of the vacuum fluorescent display to a level determined by the voltage of circuit 230.

Compact Disc And Cassette Player
If equipped, the compact disc or cassette player is part of the radio unit. When operating, the same power required by the radio is necessary for tape or disc player operation.