Radio, Stereo, and Compact Disc: Description and Operation

AUDIO SYSTEM
The factory-installed radio receiver communicates on the Chrysler Collision Detection (CCD) data bus network through a separate two-way wire harness connector. This is used for the remote radio switches that are mounted to the steering wheel, and also used for radio diagnosis with the DRB III (R).

The remote radio switches are resistor multiplexed units that are hard wired to the high line CTM through the clockspring. The CTM monitors the status of the remote radio switches and sends the proper switch status messages on the Chrysler Collision Detection (CCD) data bus network to the radio receiver. The electronic circuitry within the radio is programmed to respond to these remote radio switch status messages by adjusting the radio settings as requested.

The Infinity speakers used in the premium speaker system are driven by dual amplifiers that are integral to each of the front door speakers. One of these dual amplifiers drives the front door speaker and the A-pillar mounted tweeter for that side of the vehicle, while the other amplifier drives the rear speaker for that side of the vehicle.

The filter, choke, and power relay unit is used to control the supply of fused battery current to the front door speaker-mounted dual amplifiers.

An audio system is standard factory-installed equipment on this model, unless the vehicle is ordered with an available radio delete option. The standard equipment audio system includes an AM/FM/cassette (RAS sales code) receiver, and speakers in four locations. Several combinations of radio receivers and speaker systems are offered as optional equipment on this model. The audio system uses an ignition switched source of battery current so that the system will only operate when the ignition switch is in the ON or Accessory positions. The audio system includes the following components:
* Antenna
* Clockspring (with remote radio switches only)
* Filter, choke and speaker relay (with premium speaker system only)
* High-line or premium Central Timer Module (CTM) (with remote radio switches)
* Radio noise suppression components
* Radio receiver
* Remote radio switches (optional with RAZ radio receiver only)
* Speakers

Refer to Electrical, Restraints for more information on the clockspring. Refer to Electrical, Body Control/Central Control Module for more information on the Central Timer Module. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds. Following are general descriptions of the remaining major components in the standard and optional factory-installed audio systems.

See the owner's manual in the vehicle glove box for more information on the features, use and operation of each of the available audio systems.

Central Timer Module
The high-line or premium Central Timer Module (CTM) can also control some features of the audio system when the vehicle is equipped with the optional RAZ radio receiver and remote radio switches. A high-line CTM is used on high-line versions of this vehicle. A premium CTM is used on vehicles equipped with the optional heated seats. The CTM combines the functions of a chime/buzzer module, an intermittent wipe module, an illuminated entry module, a remote keyless entry module, and a vehicle theft security system module in a single unit.

The high-line or premium CTM also controls and integrates many of the additional electronic functions and features included on models with this option. The RAZ radio receiver with a remote radio switch option is one of the features that the CTM controls. The CTM is programmed to send switch status messages over the Chrysler Collision Detection (CCD) data bus to control the volume, seek, and pre-set station advance functions of the RAZ radio receiver. The CTM monitors the status of the remote radio switches located on the steering wheel through a hard wired circuit. The CTM then sends the proper switch status messages to the radio receiver. The electronic circuitry within the radio receiver responds to the switch status messages it receives by adjusting the radio settings as requested.

Refer to Electrical, Body Control/Central Timer Module for more information on the high-line CTM. Refer to Remote Radio Switch in Description and Operation for more information on this component. In addition, radio receivers connected to the CCD data bus have several audio system functions that can be diagnosed using a DRB III scan tool. Refer to the proper Diagnostic Procedures for more information on DRB III testing of the audio systems.

Body Control Module
Information Bus