Radio, Stereo, and Compact Disc: Description and Operation

The Electronically Tuned Radio receives an ignition on signal from I/P Fuse Block Fuse 24 and the YEL (43) wire when the Ignition Switch is in RUN, ACCY or during retained accessory power. The Clock and Memory circuits receive power from I/P Fuse Block Fuse 11 and the ORN (40) wire at all times. The Radio is grounded through the BLK (152) wire. When the Ignition Switch is in RUN, ACCY or during retained accessory power, the vacuum fluorescent display illuminates to display the time or Radio frequency setting. When the Radio ON/OFF switch is switched ON, voltage is applied to the internal circuitry and to the PNK (143) wire. The PNK (143) wire provides a Radio ON signal to the Power Antenna and Compact Disc Player, if equipped.
The Radio illumination is controlled by the Panel/Interior Light Control Dimmer. When the Head/Park Light Switch is in PARK or HEAD, voltage is applied through the dimmer control and the GRY (8) wire to the Radio Panel light and the internal circuitry. When the Panel/Interior Light Control Dimmer Switch is switched to PARK or HEAD, voltage is applied through I/P Fuse Block Fuse 21 and the DK GRN (44) wire to the Radio, signaling the internal circuitry to adjust the brightness of the vacuum fluorescent display to a level determined by the voltage of the GRY (8) wire. The Radio sends a voltage signal to the Heater and A/C Control Assembly and the Compact Disc Player, if equipped. This signal controls the Vacuum Fluorescent display illumination level, which varies as the dimmer control is adjusted.
The Compact Disc Player translates Compact Disc encoded information into audio signals and sends them to the Radio. The Radio amplifies these signals and drives the speakers. Whenever the Compact Disc Player is operating, a remote ON signal is sent to the Radio, signaling the Radio to switch its program source to the external Compact Disc Player.