AUDIO SYSTEMS

CONTENTS

page page

DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1

SERVICE PROCEDURES . . . . . . . . . . . . . . . . . . 12

GENERAL INFORMATION

Following are general descriptions of major compo-nents used in Grand Cherokee audio systems. Referto Group 8W - Wiring Diagrams for complete circuitdescriptions and diagrams.

RADIOSRadio options for the Grand Cherokee models in-

clude an AM/FM/cassette, an AM/FM/CD with 5 bandgraphic equalizer, or an AM/FM/cassette with 5 bandgraphic equalizer. All receivers are stereo Electroni-cally-Tuned Radios (ETR) and include a clock func-tion. For more information on radio features, settingprocedures, and control functions refer to the SoundSystem manual. The Sound System manual is in-cluded with the owner’s manual in the vehicle glovebox.

IGNITION-OFF DRAW FUSEAll vehicles are equipped with an Ignition-Off

Draw (IOD) fuse that is removed when the vehicle isshipped from the factory. This fuse feeds various ac-cessories that require current when the ignitionswitch is in the OFF position, including the clock andradio station preset memory functions. The fuse is re-moved to prevent battery discharge during vehiclestorage.

The IOD fuse should be checked if the radio stationpreset memory or clock functions are erratic or inop-erative. The IOD fuse is located in the Power Distri-bution Center (PDC). Refer to label under PDC coverfor IOD fuse identification.

SPEAKERSThe standard equipment speaker system includes

four door-mounted full-range speakers. The premiumInfinity Gold speaker option upgrades all the speak-ers to Infinity models. The Infinity Gold package in-cludes two instrument panel-mounted tweeters, twofront door-mounted mid-range, and two rear door-mounted coaxial speakers. The Infinity speakers arepowered by a 120 watt amplifier mounted under therear seat cushion.

ANTENNAStandard equipment is a fixed-length stainless

steel rod-type antenna mast, installed at the rightfront fender of the vehicle. A power antenna is in-cluded in the Infinity Gold speaker package. The an-tenna mast is connected to the center wire of thecoaxial antenna cable and is not grounded to anypart of the vehicle.

To eliminate static, the antenna base must have agood ground. The coaxial antenna cable shield (theouter wire mesh of the cable) is grounded to the an-tenna base and the radio chassis.

The power antenna is designed to raise automati-cally when both the ignition switch and the radio areturned ON. When the ignition is turned ON and theradio is turned OFF, the antenna will return to, orremain in, the retracted position. The power antennais a telescoping type antenna, extended and retractedby a reversible electric motor.

The antenna is controlled by a combination of anexternal relay located in the relay center and twolimit switches that are built into the antenna motorhousing. There is a gear-operated cam system to ac-tivate the switches. The limit switches are used toopen the motor circuits when the antenna mastreaches the full up or full down position.

The antenna cannot be adjusted to an inter-mediate position. It must be fully extended orretracted.

When the radio or ignition switch is turned OFF,the power antenna relay is de-energized. With thecoil de-energized, battery voltage switches to the mo-tor through the closed lower limit switch. The an-tenna then retracts until the lower limit switchopens.

The factory installed ETRs automatically compen-sate for radio antenna trim. Therefore, no antennatrimmer adjustment is required or possible when re-placing the receiver or the antenna.

ZJ AUDIO SYSTEMS 8F - 1

RADIO NOISE SUPPRESSIONRadio Frequency Interference (RFI) and Electro-

Magnetic Interference (EMI) noise suppression is ac-complished primarily through circuitry internal tothe radio receivers. These internal suppression de-vices are only serviced as a part of the radio receiver.

External suppression devices that are serviceableand should be checked in the case of RFI or EMInoise complaints include the following:• radio antenna base ground• engine-to-body ground strap• resistor-type spark plugs• radio suppression-type secondary ignition wiring.

In addition, if the source of RFI or EMI noise isidentified as a component on the vehicle (i.e.:genera-tor, blower motor, etc.), the ground path for that com-

ponent should be checked. If excessive resistance isfound in that circuit, repair as required before con-sidering any component replacement.

Fleet vehicles are available with an extra-cost RFI-suppressed Powertrain Control Module (PCM). Thisunit reduces interference generated by the PCM onsome radio frequencies used in two-way radio com-munications. However, this unit will not resolve com-plaints of RFI in the commercial AM or FM radiofrequency ranges.

ON-BOARD DIAGNOSTIC SYSTEMThe DRB scan tool may be used to test the audio

system. Refer to the appropriate Diagnostic Proce-dures manual for more information.

8F - 2 AUDIO SYSTEMS ZJ

DIAGNOSIS

POWER ANTENNA(1) Remove power antenna relay from relay center.

Turn ignition switch to ON position. Connect ajumper wire between the relay connector cavities 2and 4. Continue with next step.

(2) Connect another jumper wire between relayconnector cavities 6 and 1. The antenna should goup. If not OK, replace power antenna.

(3) Move the jumper wire between relay connectorcavities 2 and 4 to between cavities 2 and 5. Con-tinue with next step.

(4) Move the jumper wire between relay connectorcavities 6 and 1 to between cavities 4 and 1. The an-tenna should go down. If not OK, replace power an-tenna. If antenna operates up and down, replace theantenna relay.

POWER ANTENNA RELAY(1) Remove power antenna relay from relay center.

Turn ignition switch to ON position and turn radioon. Measure the voltage at relay connector cavity 2.There should be 12 volts. If not, repair open to fuse1.

(2) Measure the voltage at relay connector cavity3. There should be 12 volts. If not, repair open toright radio connector cavity 7.

(3) Turn radio off. Measure resistance between re-lay connector cavity 1 and a good ground. Metershould read zero ohms. If OK, go to Power Antennadiagnosis in this group. If not OK, repair open toground.

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AUDIO SYSTEM CONNECTORS

8F - 4 AUDIO SYSTEMS ZJ

RADIO DIAGNOSIS

ZJ AUDIO SYSTEMS 8F - 5

CHART A — INFINITY

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CHART B — INFINITY

ZJ AUDIO SYSTEMS 8F - 7

CHART A AND B — NON-INFINITY

8F - 8 AUDIO SYSTEMS ZJ

CHART C AND D — ALL RADIOS

ZJ AUDIO SYSTEMS 8F - 9

CHART E — ALL CASSETTE TAPE PLAYERS

8F - 10 AUDIO SYSTEMS ZJ

CHART F — ALL COMPACT DISC PLAYERS

ZJ AUDIO SYSTEMS 8F - 11

SERVICE PROCEDURES

RADIO REMOVE/INSTALL(1) Disconnect battery negative cable.(2) Remove ash receiver.(3) Remove 6 screws from center instrument clus-

ter bezel assembly (Fig. 1).

(4) Remove center bezel.(5) Remove 2 screws from radio (Fig. 2).

(6) Pull radio out far enough to gain access to theground terminal on the rear of the radio.

(7) Remove ground clip from terminal on rear ofradio and remove radio.

(8) Reverse removal procedures to install.

AMPLIFIER REMOVE/INSTALL(1) Disconnect battery negative cable.(2) Disengage left rear seat cushion by pulling up-

ward on release strap.(3) Tilt seat cushion forward.(4) Lift the carpeting in the underseat area far

enough to access amplifier.(5) Disconnect two wire harness connectors from

amplifier (Fig. 3).

(6) Remove three screws retaining amplifier tofloor pan.

(7) Reverse removal procedures to install.

SPEAKERS REMOVE/INSTALL

DOORS(1) Remove screw from demister opening at front

of door (front door).(2) Remove screw at top of trim panel near mirror

(Fig. 4).(3) Remove screw and door handle cover.(4) Remove screw from under armrest.(5) Remove screw from bottom of hand hold in

armrest.(6) Remove the trim panel with a wide, flat-bladed

tool (Fig. 5).To aid in removal of the trim panel, start at

the bottom of the panel.(7) Remove screws holding speaker in door.(8) Pull speaker out far enough to unplug connec-

tor.

Fig. 1 Remove Center Bezel Retaining Screws

Fig. 2 Radio Remove/Install

Fig. 3 Amplifier Remove/Install

8F - 12 AUDIO SYSTEMS ZJ

(9) Reverse removal procedures to install.

INSTRUMENT PANEL(1) Disconnect battery negative cable.(2) Remove ash receiver.(3) Remove 6 screws holding center instrument

cluster bezel (Fig. 6).(4) Remove center bezel.(5) Remove 2 screws holding dash pad located be-

hind top of center bezel.(6) Gently pry defroster grille out of dash pad.(7) Unplug auto headlamp and sun sensors (if

equipped) and set defroster grille aside.(8) Remove 4 screws in defroster duct opening

holding dash pad (Fig. 7).(9) Remove 3 screws above instrument panel clus-

ter holding dash pad (Fig. 8).(10) Open glove box and remove 2 screws holding

dash pad.(11) Remove dash pad.(12) Remove 2 screws holding tweeter (Fig. 9).(13) Unplug tweeter connection and remove

tweeter.

(14) Reverse removal procedures to install.

Fig. 4 Door Trim Panel Remove/Install

Fig. 5 Door Trim Panel Removal

Fig. 6 Remove Center Bezel Retaining Screws

Fig. 7 Upper Dash Pad Attaching Screws

Fig. 8 Cluster Bezel to Dash Pad Screws

ZJ AUDIO SYSTEMS 8F - 13

ANTENNA REMOVE/INSTALL

FIXED(1) Remove the right fender inner splash shield to

gain access to the antenna base and cable.(2) Remove the antenna mast, cap nut and es-

cutcheon from the top of the fender (Fig. 10).

(3) Remove the passenger side cowl side trimpanel.

(4) Disconnect the antenna lead (Fig. 11) by pull-ing apart while twisting the metal connectors. DONOT PULL ON THE COAX CABLE.

(5) Pull the rubber grommet out of the cowl sidepanel.

(6) Remove the antenna assembly from inside theright fender wheel opening.

(7) Reverse removal procedures to install.(8) Verify antenna and radio operation.

POWER(1) Remove the right fender inner splash shield to

gain access to the power antenna mounting screws.

(2) Remove the cap nut and escutcheon from thetop of the fender (Fig. 12).

(3) Remove the passenger side cowl side trimpanel.

(4) Disconnect the antenna lead (Fig. 11) by pull-ing apart while twisting the metal connectors. DONOT PULL ON THE COAX CABLE.

(5) Disconnect the power antenna wire harnessconnector.

(6) Remove the antenna mounting bolts and wash-ers (Fig. 12).

(7) Pull the rubber grommet out of the cowl sidepanel.

(8) Pull the antenna motor harness through thehole in the cowl side panel.

(9) Remove the antenna assembly from inside theright fender wheel opening.

Fig. 9 Tweeter Remove/Install

Fig. 10 Remove/Install Nut and Escutcheon

Fig. 11 Disconnect Antenna Lead—Typical

Fig. 12 Remove/Install Escutcheon and Antenna Pad

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(10) Reverse removal procedures to install.(11) Verify antenna and radio operation.

POWER ANTENNA RELAY REMOVE/INSTALL(1) Open glove box and remove 3 screws holding

relay center cover (Fig. 13).

(2) Remove power antenna relay (Fig. 14)(3) Reverse removal procedures to install.

Fig. 13 Relay Center Cover Remove/Install Fig. 14 Power Antenna Relay

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