AUDIO SYSTEMS CONTENTS page page DIAGNOSIS ............................. 3 GENERAL INFORMATION .................. 1 SERVICE PROCEDURES .................. 12 GENERAL INFORMATION Following are general descriptions of major compo- nents used in Grand Cherokee audio systems. Refer to Group 8W - Wiring Diagrams for complete circuit descriptions and diagrams. RADIOS Radio options for the Grand Cherokee models in- clude an AM/FM/cassette, an AM/FM/CD with 5 band graphic equalizer, or an AM/FM/cassette with 5 band graphic equalizer. All receivers are stereo Electroni- cally-Tuned Radios (ETR) and include a clock func- tion. For more information on radio features, setting procedures, and control functions refer to the Sound System manual. The Sound System manual is in- cluded with 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 ac- cessories that require current when the ignition switch is in the OFF position, including the clock and radio station preset memory functions. The fuse is re- moved to prevent battery discharge during vehicle storage. The IOD fuse should be checked if the radio station preset 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 cover for IOD fuse identification. SPEAKERS The standard equipment speaker system includes four door-mounted full-range speakers. The premium Infinity Gold speaker option upgrades all the speak- ers to Infinity models. The Infinity Gold package in- cludes two instrument panel-mounted tweeters, two front door-mounted mid-range, and two rear door- mounted coaxial speakers. The Infinity speakers are powered by a 120 watt amplifier mounted under the rear seat cushion. ANTENNA Standard equipment is a fixed-length stainless steel rod-type antenna mast, installed at the right front 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 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 an- tenna base and the radio chassis. The power antenna is designed to raise automati- cally when both the ignition switch and the radio are turned ON. When the ignition is turned ON and the radio is turned OFF, the antenna will return to, or remain in, the retracted position. The power antenna is a telescoping type antenna, extended and retracted by a reversible electric motor. The antenna is controlled by a combination of an external relay located in the relay center and two limit switches that are built into the antenna motor housing. There is a gear-operated cam system to ac- tivate the switches. The limit switches are used to open the motor circuits when the antenna mast reaches the full up or full down position. The antenna cannot be adjusted to an inter- mediate position. It must be fully extended or retracted. When the radio or ignition switch is turned OFF, the power antenna relay is de-energized. With the coil de-energized, battery voltage switches to the mo- tor through the closed lower limit switch. The an- tenna then retracts until the lower limit switch opens. The factory installed ETRs automatically compen- sate for radio antenna trim. Therefore, no antenna trimmer adjustment is required or possible when re- placing the receiver or the antenna. ZJ AUDIO SYSTEMS 8F - 1
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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.
ZJ AUDIO SYSTEMS 8F - 3
AUDIO SYSTEM CONNECTORS
8F - 4 AUDIO SYSTEMS ZJ
RADIO DIAGNOSIS
ZJ AUDIO SYSTEMS 8F - 5
CHART A — INFINITY
8F - 6 AUDIO SYSTEMS ZJ
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-