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

2. 8F - 2 AUDIO SYSTEMS ZJ
RADIO NOISE SUPPRESSION ponent should be checked. If excessive resistance is
Radio Frequency Interference (RFI) and Electro- found in that circuit, repair as required before con-
Magnetic Interference (EMI) noise suppression is ac- sidering any component replacement.
complished primarily through circuitry internal to Fleet vehicles are available with an extra-cost RFI-
the radio receivers. These internal suppression de- suppressed Powertrain Control Module (PCM). This
vices are only serviced as a part of the radio receiver. unit reduces interference generated by the PCM on
External suppression devices that are serviceable some radio frequencies used in two-way radio com-
and should be checked in the case of RFI or EMI munications. However, this unit will not resolve com-
noise complaints include the following: plaints of RFI in the commercial AM or FM radio
• radio antenna base ground frequency ranges.
• engine-to-body ground strap
• resistor-type spark plugs ON-BOARD DIAGNOSTIC SYSTEM
• radio suppression-type secondary ignition wiring. The DRB scan tool may be used to test the audio
In addition, if the source of RFI or EMI noise is system. Refer to the appropriate Diagnostic Proce-
identified as a component on the vehicle (i.e.:genera- dures manual for more information.
tor, blower motor, etc.), the ground path for that com-

3. ZJ AUDIO SYSTEMS 8F - 3
DIAGNOSIS
POWER ANTENNA POWER ANTENNA RELAY
(1) Remove power antenna relay from relay center. (1) Remove power antenna relay from relay center.
Turn ignition switch to ON position. Connect a Turn ignition switch to ON position and turn radio
jumper wire between the relay connector cavities 2 on. Measure the voltage at relay connector cavity 2.
and 4. Continue with next step. There should be 12 volts. If not, repair open to fuse
(2) Connect another jumper wire between relay 1.
connector cavities 6 and 1. The antenna should go (2) Measure the voltage at relay connector cavity
up. If not OK, replace power antenna. 3. There should be 12 volts. If not, repair open to
(3) Move the jumper wire between relay connector right radio connector cavity 7.
cavities 2 and 4 to between cavities 2 and 5. Con- (3) Turn radio off. Measure resistance between re-
tinue with next step.
lay connector cavity 1 and a good ground. Meter
(4) Move the jumper wire between relay connector
should read zero ohms. If OK, go to Power Antenna
cavities 6 and 1 to between cavities 4 and 1. The an-
diagnosis in this group. If not OK, repair open to
tenna should go down. If not OK, replace power an-
ground.
tenna. If antenna operates up and down, replace the
antenna relay.

4. 8F - 4 AUDIO SYSTEMS ZJ
AUDIO SYSTEM CONNECTORS

5. ZJ AUDIO SYSTEMS 8F - 5
RADIO DIAGNOSIS

6. 8F - 6 AUDIO SYSTEMS ZJ
CHART A — INFINITY

7. ZJ AUDIO SYSTEMS 8F - 7
CHART B — INFINITY

8. 8F - 8 AUDIO SYSTEMS ZJ
CHART A AND B — NON-INFINITY

9. ZJ AUDIO SYSTEMS 8F - 9
CHART C AND D — ALL RADIOS

10. 8F - 10 AUDIO SYSTEMS ZJ
CHART E — ALL CASSETTE TAPE PLAYERS

11. ZJ AUDIO SYSTEMS 8F - 11
CHART F — ALL COMPACT DISC PLAYERS

12. 8F - 12 AUDIO SYSTEMS ZJ
SERVICE PROCEDURES
RADIO REMOVE/INSTALL (7) Remove ground clip from terminal on rear of
(1) Disconnect battery negative cable. radio and remove radio.
(2) Remove ash receiver. (8) Reverse removal procedures to install.
(3) Remove 6 screws from center instrument clus-
ter bezel assembly (Fig. 1). 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).
Fig. 3 Amplifier Remove/Install
(6) Remove three screws retaining amplifier to
floor pan.
Fig. 1 Remove Center Bezel Retaining Screws (7) Reverse removal procedures to install.
(4) Remove center bezel. SPEAKERS REMOVE/INSTALL
(5) Remove 2 screws from radio (Fig. 2).
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
Fig. 2 Radio Remove/Install the bottom of the panel.
(6) Pull radio out far enough to gain access to the (7) Remove screws holding speaker in door.
ground terminal on the rear of the radio. (8) Pull speaker out far enough to unplug connec-
tor.

13. ZJ AUDIO SYSTEMS 8F - 13
Fig. 4 Door Trim Panel Remove/Install
Fig. 6 Remove Center Bezel Retaining Screws
Fig. 5 Door Trim Panel Removal
(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). Fig. 7 Upper Dash Pad Attaching Screws
(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. Fig. 8 Cluster Bezel to Dash Pad Screws
(11) Remove dash pad.
(12) Remove 2 screws holding tweeter (Fig. 9). (14) Reverse removal procedures to install.
(13) Unplug tweeter connection and remove
tweeter.

14. 8F - 14 AUDIO SYSTEMS ZJ
Fig. 9 Tweeter Remove/Install
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).
Fig. 11 Disconnect Antenna Lead—Typical
(2) Remove the cap nut and escutcheon from the
top of the fender (Fig. 12).
Fig. 10 Remove/Install Nut and Escutcheon Fig. 12 Remove/Install Escutcheon and Antenna Pad
(3) Remove the passenger side cowl side trim (3) Remove the passenger side cowl side trim
panel. panel.
(4) Disconnect the antenna lead (Fig. 11) by pull- (4) Disconnect the antenna lead (Fig. 11) by pull-
ing apart while twisting the metal connectors. DO ing apart while twisting the metal connectors. DO
NOT PULL ON THE COAX CABLE. NOT PULL ON THE COAX CABLE.
(5) Pull the rubber grommet out of the cowl side (5) Disconnect the power antenna wire harness
panel. connector.
(6) Remove the antenna assembly from inside the (6) Remove the antenna mounting bolts and wash-
right fender wheel opening. ers (Fig. 12).
(7) Reverse removal procedures to install. (7) Pull the rubber grommet out of the cowl side
(8) Verify antenna and radio operation. panel.
(8) Pull the antenna motor harness through the
POWER hole in the cowl side panel.
(1) Remove the right fender inner splash shield to (9) Remove the antenna assembly from inside the
gain access to the power antenna mounting screws. right fender wheel opening.

15. ZJ AUDIO SYSTEMS 8F - 15
Fig. 13 Relay Center Cover Remove/Install Fig. 14 Power Antenna Relay
(10) Reverse removal procedures to install. (2) Remove power antenna relay (Fig. 14)
(11) Verify antenna and radio operation. (3) Reverse removal procedures to install.
POWER ANTENNA RELAY REMOVE/INSTALL
(1) Open glove box and remove 3 screws holding
relay center cover (Fig. 13).