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 manual antenna mast has a swirl shape to prevent antenna whistle. The power antenna is a one piece design to reduce mast damage because it is more flexible.

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 10 Amp fuse. When removed it prevents the battery from discharging during storage.
The vehicle has two speaker systems:

Standard Speaker System
- Two instrument panel speakers
- Two door speakers
- Two rear quarter panel speakers

Infinity Amplified Speaker System
- Amplifier mounted under the passenger seat
- Two instrument panel speakers
- Two door speakers
- Two rear quarter panel speakers

While driving the amplifier provides unique sound equalizations when the convertible top is in the up position or in the down position. The amplifier remembers which mode it is in as long as the battery voltage (B+) is supplied to the amplifier. If the battery voltage is removed for only a few minutes by:
- Disconnecting the battery
- Dead battery
- Amplifier disconnected
The amplifier reverts to a top up condition even if the top is down. If the amplifier mode does not match the convertible top position, operate the convertible top one cycle and the will reset amplifier to the correct mode.

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.

To eliminate radio interference, ground straps are used in different areas of the vehicle. These ground circuits should be securely tightened to assure good metal to metal contact. The ground straps conduct very small high frequency electrical signals to ground and require clean surface contact area. The radio ground is supplied from the instrument panel harness and is attached to the rear of the radio. Some engines have other ground straps to eliminate further radio interference:
- Engine to shock tower, - 2.4L - 2.5L engines.
- Engine to transmission, 2.5L engine
- Muffler to bumper beam, - 2.4L engines
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 whip 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. Clean the antenna mast 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 disc 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.

CIRCUIT OPERATION
Radio Illumination
When the parking lamps or the headlamps are ON, circuits E2 and L7 are used to power the radio illumination lamps. Circuit E2 is controlled by the Body Control Module (BCM). Circuit L7 is controlled by the park lamp switch.

Radio Memory
Both the base and premium systems use the M1 circuit to maintain radio memory This circuit is connected to the battery through the Power Distribution Center (PDC), and protected by a 10 Amp Ignition Off Draw (IOD) fuse. The M1 circuit is used to supply power to the Body Control Module (BCM), Power Mirrors, and the Power Door Locks. This fuse is also used in several other circuits. The IOD fuse is removed during vehicle shipping to prevent excessive battery draw.

Radio Operation
There are two audio systems offered on this vehicle. The base system uses six speakers and a standard antenna. The optional system has six speakers, power Amplifier, and a power antenna.

Both systems are powered by a 10 Amp fuse located in cavity 14 of the junction block on circuit X12. This fuse is HOT when the ignition switch is in the ACCESSORY or RUN position.

The A31 circuit which receives it's power from the ignition switch, on circuit A1, is protected by a 20 Amp fuse located in cavity 8 of the Power Distribution Center (PDC).

Both the standard and optional radios use an external case ground. This case ground attaches to the rear of the radio and the instrument panel. There is also a ground for the radio provided on circuit Z1. This circuit attaches to the rear of the radio and terminates at the instrument panel ground.