Jeep Cherokee 2000 Service Manual - page 403
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 stan-
dard 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 rod-
type 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 dis-
connect, located near the right cowl side inner panel
behind the instrument panel. This additional discon-
nect 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 fol-
lowing:
•
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 wir-
ing.
For more information on the spark plugs and sec-
ondary ignition components, refer to Ignition Sys-
tem in the Description and Operation section of
Group 8D - Ignition System.
DIAGNOSIS AND TESTING
AUDIO SYSTEM
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER
TO
GROUP
8M
-
PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING
WHEEL,
STEERING
COLUMN,
OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
8F - 2
AUDIO SYSTEMS
XJ
DESCRIPTION AND OPERATION (Continued)