Radio, Stereo, and Compact Disc: Description and Operation

RADIO
Voltage to the Radio is available at all times through the ORN (1140) wire. This Circuit provides Voltage for Radio Station Memory Storage. It also provides Voltage for the Clock Memory. With the Ignition Switch in ACC or RUN, Voltage is supplied to the Radio through the RADIO Fuse and the YEL (43) wire. Each Speaker has its own pair of leads. The Radio/Clock Display brightness is at full intensity with the Ignition Switch in ACC or RUN; Voltage is supplied by the YEL (43) wire. When the Park or Headlamps are turned on, Voltage is supplied to the Radio through the PPL/WHT (1382). When the Radio senses this signal, the Radio switches Voltage for the display from the YEL (43) wire to the GRY (8) wire. The display brightness is then controlled by the Panel and Interior Lamps Control Switch. The Radio illumination bulb Voltage is supplied by the GRY (8) wire.


POWER AMPLIFIER (SUBURBAN ONLY)
The optional amplifier boosts the sound of the Four Rear Speakers in the SUBURBAN when equipped with the premium sound system.

With the Ignition Switch in ACC or RUN position and the Radio Control Head ON, Battery Voltage is supplied to the Power Amplifier Relay through the PNK/BLK (143) and ORN (40) wires. The Relay is grounded through the BLK (150) wire at the I/P Ground G200. When the relay contacts close, Battery Voltage is supplied to the Power Amplifier through the ORN (140) wire, the ground is completed through the BLK (150) wire at the I/P Ground G200.


REMOTE CASSETTE TAPE PLAYER (OPTIONAL)
With the Ignition Switch in RUN and the Radio Control Head ON, Voltage is supplied to the Cassette Tape Player through the Radio.

With the Remote Cassette Tape Player in PLAY, the Tape Player returns a Tape ON signal and the Stereo Audio signals to the Radio. The Tape ON signal causes the Receiver Circuitry to ignore the signals from the Tuner and to send the audio signals from the Tape Player to the Speakers. With a Cassette Tape in FWD, REV, or SEEK, the Tape Player applies a mute signal to the Radio to prohibit the Audio sound of these functions from being heard. When the EJECT Button is pushed on the Tape Player, the Tape ON signal is terminated and the Radio returns to normal operation.