Antenna: Description and Operation

Radio Control Knob/LCD Display Illumination

The Main Light Switch dimming rheostat controls the brightness of the Radio control knob illumination bulbs and the LCD time/frequency display.

Radio Memory and Operating Power

Voltage is present at connector C257, pin 1, of the Radio at all times through Fuse 5 and circuit 937 (R/W) and 797 (LG/P). This constant power to the Radio maintains clock and station preset memory functions.

With the Ignition Switch in ACC or RUN, voltage is also present at connector C257, pin 3 of the Radio, through Fuse 16 and circuit 137 (Y/BK). When the Radio is turned on, current flows through circuit 137 (Y/BK) and the Radio circuits to ground. The Radio turns ON.

Power Antenna

With the ignition Switch in ACC or RUN, voltage is present at the Power Antenna Switch. The Power Antenna Switch controls operation of the reversible Power Antenna Motor.

With the Power Antenna Switch moved to UP, current flows through circuit 745 (R/PK) and the Power Antenna Motor: the Motor runs to extend the antenna mast. With the Power Antenna Switch moved to DOWN, current flows through the Power Antenna Motor in the opposite direction, and the mast retracts.