Radio/Stereo: Description and Operation
AUDIO SYSTEMThe vehicles are shipped with fuse 4 removed from the fuse block. The fuse replaces the Ignition Off Draw (IOD) connector. Fuse 4 is a fifteen amp fuse. When removed it prevents the battery from discharging during storage. This fuse must be inserted for the audio system to be supplied with power.
The antenna is located in the windshield.
Operating instructions for the factory installed audio system can be found in the Sound Systems Operating Instructions in the Owners Manual supplied with the vehicle.
RADIO
The radio has a cassette player AM/FM tuner, and a five band graphic equalizer. The radio controls the remote CD changer using a DIN cable.
The radio receives delta volume level over the CCD bus from the BCM based on the speed of the vehicle and the position of the Auto Volume Switch.
INFINITY AMPLIFIED SPEAKER SYSTEM
- Amplifier mounted under the passenger seat.
- Two instrument panel speakers.
- Two door speakers.
- Three rear speakers in the audio system box.
The instrument panel and rear 3-1/2 inch speakers provide mid to high frequency tones. The subwoofer provides low frequency bass. The door speakers provide low to mid frequency tones.
REMOTE AMPLIFIER
The amplifier, located under the passenger seat, amplifies the audio signal and contains crossover circuitry.
When the radio system is ON, and all or some speakers are not operating or have a noise distortion refer to Diagnosis and Testing. Refer to Wiring Diagrams for Pin numbers and location.
REMOTE CD CHANGER
The remote CD changer is located on the rear bulkhead behind the passenger seat back.
The magazine is capable of holding up to six discs. 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.
Remote Radio Switch Operational View:
REMOTE RADIO SWITCHES
Remote radio control switches are available on Prowler. Two rocker-type switches are mounted on the back (instrument panel side) of the steering wheel spokes. The switch on the left spoke is the seek switch and has seek up, seek down, and preset station advance functions. The switch on the right spoke is the volume control switch and has volume up, and volume down functions.
These switches are resistor multiplexed units that are hard wired to the Body Control Module (BCM) through the clockspring. The BCM sends the proper messages on the Chrysler Collision Detection (CCD) data bus network to the radio receiver. For diagnosis of the BCM or the CCD data bus, the use of a DRB scan tool and the proper Body Diagnostic Procedures are recommended. For more information on the operation of the remote radio switch controls, refer to the Owner's Manual in the vehicle glove box.
AutoVolume Switch System Schematic:
AUTO VOLUME SWITCH
The AutoVolume Switch is located above the auxiliary power outlet in the instrument panel, next to the radio. It has three settings: OFF, LOW, and HIGH.
The system is designed to keep the volume at a level that just overcomes road and wind noise in typical situations. Ideally, you should perceive little or no volume change. Of course, the amount of adjustment designed into the system is a compromise. If the wind is blowing from behind you, the perceived volume change will be different than if the wind is blowing from the side. If you are accelerating, the perceived volume change will be less than when decelerating (due to the Prowler's exceptionally cool exhaust note on acceleration).
The volume will remain the same at speeds less than 20 mph. Also, the volume adjusts in a series of steps that are sometimes perceptible. Typically, the volume steps are more perceptible when the radio volume is at low levels. When the radio volume is cranked up, the (AutoVolume) changes are much less noticeable.
NOTE: If you run with the switch in HIGH position and the top up/windows up, the volume change will be very obvious. If you adjust the radio volume while cruising on the expressway and then slow to a stop, the volume will likely adjust to a level much lower than you want. It may even adjust all the way down, with nothing coming from the speakers.
The BCM monitors the AutoVolume switch position to determine driver preference of LOW, OFF, or HIGH. The BCM determines the speed of the vehicle based on a message from the PCM. The BCM then sends a message over the CCD bus to the radio. The message tells the radio how much to adjust the radio volume up from the base setting.