Jeep Cherokee (XJ): Description and operation

Radio

Available factory-installed radio receivers for this model include an AM/FM (RAL sales code), an AM/FM/cassette (RAS sales code), and an AM/FM/ CD/cassette/3-band graphic equalizer (RAZ sales code). All factory-installed radio receivers are stereo Electronically Tuned Radios (ETR), and include an electronic digital clock function.

The radio can only be serviced by an authorized radio repair station. Refer to the latest Warranty Policies and Procedures manual for a current listing of authorized radio repair stations.

For more information on radio features, setting procedures, and control functions refer to the owner's manual in the vehicle glove box.

Ignition-off draw fuse

All vehicles are equipped with an Ignition-Off Draw (IOD) fuse that is removed when the vehicle is shipped from the factory. This fuse feeds various accessories that require battery current when the ignition switch is in the Off position, including the clock and radio station preset memory functions. The fuse is removed to prevent battery discharge during vehicle storage.

When removing or installing the IOD fuse, it is important that the ignition switch be in the Off position.

Failure to place the ignition switch in the Off position can cause the radio display to become scrambled when the IOD fuse is removed and replaced.

Removing and replacing the IOD fuse again, with the ignition switch in the Off position, will correct the scrambled display condition.

The IOD fuse should be checked if the radio is inoperative. The IOD fuse is located in the Power Distribution Center (PDC). Refer to the PDC label for IOD fuse identification and location.

Speaker

The standard equipment speaker system includes two 13.3 centimeter (5.25 inch) diameter full-range speakers. Each speaker is mounted to the lower front corner of the front door inner panel behind the door trim panel.

The four speaker option adds two 13.3 centimeter (5.25 inch) diameter full-range speakers to the standard speaker system, for a total of four speakers.

Each of the additional speakers is mounted behind a grille installed on the outboard ends of a speaker support structure, which is integral to the headliner and located just forward of the upper liftgate opening reinforcement near the rear of the vehicle cargo area.

The premium speaker option upgrades all of the speakers to Infinity models, and includes a 100 watt Infinity amplifier. Each front door has two separate Infinity speakers: a woofer mounted low in the door, and a tweeter mounted behind the door flag trim panel. Infinity coaxial speakers are mounted in the headliner speaker support structure. The Infinity amplifier is mounted to the floor panel under the left rear seat cushion.

Antenna

All models use a fixed-length stainless steel rodtype antenna mast, installed at the right front fender of the vehicle. The antenna mast is connected to the center wire of the coaxial antenna cable, and is not grounded to any part of the vehicle.

To eliminate static, the antenna base must have a good ground. The coaxial antenna cable shield (the outer wire mesh of the cable) is grounded to the antenna base and the radio chassis.

The antenna coaxial cable has an additional disconnect, located near the right cowl side inner panel behind the instrument panel. This additional disconnect allows the instrument panel assembly to be removed and installed without removing the radio.

The factory-installed Electronically Tuned Radios (ETRs) automatically compensate for radio antenna trim. Therefore, no antenna trimmer adjustment is required or possible when replacing the receiver or the antenna.

Radio noise suppression

DESCRIPTION

Radio Frequency Interference (RFI) and Electro- Magnetic Interference (EMI) noise suppression is accomplished primarily through circuitry internal to the radio receivers. These internal suppression devices are only serviced as part of the radio receiver.

External suppression devices that are used on this vehicle to control RFI or EMI noise include the following:

•  Radio antenna base ground
•  Radio receiver chassis ground wire or strap
•  Engine-to-body ground strap
•  Resistor-type spark plugs
•  Radio suppression-type secondary ignition wiring.

For more information on the spark plugs and secondary ignition components, refer to Ignition System in the Description and Operation section of Group 8D - Ignition System.