Radio/Stereo: Description and Operation

INTRODUCTION
For operation of the factory installed standard and optional radios with cassette or compact disc player, refer to the Sound Systems Operating Instructions in the Owners Manual supplied with the vehicle.

The vehicles are shipped with fuse 5 removed from the Junction Block. The fuse replaces the ignition-off draw (IOD) connector. Fuse 5 is a ten amp fuse. When removed it prevents the battery from discharging during storage.

SYSTEM OPERATION
Interference Elimination
Some components used on the vehicles are equipped with a capacitor to suppress radio frequency interference/static.

Capacitors are mounted in various locations internal to the generator, instrument cluster and windshield wiper motor.

A ground strap is mounted from the engine to shock tower. On four cylinder engines, there is a ground strap from the rear of the muffler to the muffler mounting bracket. These ground circuits should be securely tightened to assure good metal to metal contact. Ground straps conduct very small high frequency electrical signals to ground and require clean large surface area contact. The radio grounds to the cross car beam through pinch brackets that grounds automatically as the radio is installed into the instrument panel.

Radio resistance type spark plug cables in the high tension circuit of the ignition system complete the interference suppression. Faulty or deteriorated spark plug wires should be replaced.

Power Antenna
The power operated radio antenna is a telescoping type antenna, extended and retracted by a reversible electric motor.

The Automatic Power Antenna is controlled by a combination of an internal relay and limit switches which, are built into the antenna motor housing. This antenna is actuated when the radio is switched ON and the ignition switch in ON or ACCESSORY position. When the ignition switch or the radio is turned OFF the antenna mast should retract fully.

Many antenna problems may be avoided by frequent cleaning of the antenna mast telescoping sections. Clean the antenna mast sections with a clean soft cloth.

Before an antenna is removed, the antenna performance should be tested to decide if it is a reception problem or an operational problem.

Whenever a operational malfunction occurs, first verify that the radio antenna wire harness is properly connected. Check all connectors before starting normal diagnosis and repair procedures.

Remote Amplifier
The amplifier is located under the right front seat. When the radio system is ON, and all or some speakers are not operating or have a noise distortion refer to the diagnostic tests.

Remote CD Changer
The remote CD changer is located in the center console and is capable of holding up to six discs in a magazine. The magazine can be ejected at anytime that the ignition switch is in the ON position. After the ignition switch is turned OFF, the magazine can only be ejected within one minute. After that period, the magazine will be locked in the CD changer.