Vision V6-3.5L VIN F (1997)
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 13 removed from the junction block. The fuse replaces the ignition-off draw (IOD) connector. Fuse 13 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.
Rear Window Antenna
The integrated rear window antenna incorporates the rear window defogger and a electronic module to receive radio signals. The module is located
right C-pillar behind the trim panel.
The FM signal is received via the heated portion of the rear window defogger grid. The AM signal is received via two isolated unheated lines
along the top of the rear window.
NOTE: If an accessory cellular phone glass mount antenna is installed, it should only be along the center of the window, not touching any
conductive lines in the area indicated.
Remote Amplifier
The amplifier is located in the trunk on the left side wall of the trunk and behind the liner.
When the radio system is ON, and all or some speakers are not operating or have a noise distortion refer to the diagnostic tests.
CIRCUIT OPERATION
Radio Operation
There are three audio systems offered on this vehicle. The base system uses six speakers and a standard antenna, or an antenna located in the rear
window defogger grid. The midline system has six speakers and a standard antenna.
The premium system has seven speakers, a power amplifier, and a power antenna, or an antenna located in the rear window defogger grid.
All of the systems are powered by a 10 amp fuse located in cavity 2 of the junction block on circuit X12. This fuse is HOT when the ignition
switch is in the ACCESSORY or RUN position. Power for the fuse is provided on circuit A31.
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 A of the Power
Distribution Center (PDC).