Ignition-Off Draw Fuse; Speaker - Jeep 1997 Grand Cherokee Service Manual

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DESCRIPTION AND OPERATION (Continued)

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 posi-
tion. Failure to place the ignition switch in the Off
position can cause the radio display to become scram-
bled 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 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 the PDC label for IOD
fuse identification and location.

SPEAKER

The only speaker system offered with the base
AM/FM/cassette radio receiver (RAS sales code)
includes four full-range speakers, one mounted in
each of the four doors. This is also the standard
equipment speaker system offered with the AM/FM/
CD/cassette/3-band graphic equalizer (RAZ sales
code).
Optional for the RAZ sales code radio, and stan-
dard for all other radios (except RAS sales code) is
the Infinity Gold premium speaker and 120 watt
amplifier package. This package uses an Infinity
amplifier mounted on the floor beneath the rear seat
cushion on the driver side of the vehicle. The package
includes an Infinity
mounted in each rear door, an Infinity mid-range
speaker mounted in each front door, and an Infinity
tweeter mounted at each outboard end of the instru-
ment panel top cover.
The standard equipment speaker system for the
Limited Plus package is the Infinity Gold premium
speaker and 180 watt amplifier package. In addition
to the increased amplifier output, this package adds
a sound bar mounted on the inside roof headliner,
just forward of the liftgate opening. This package
uses the same Infinity speakers as the 120 watt
amplifier package in the front doors and the instru-
ment panel, but uses Infinity woofers in the rear
doors. In addition, the sound bar houses two Infinity
woofers and two Infinity tweeters, for a total of ten
system speakers.
coaxial full-range speaker
ANTENNA
Antenna availability is affected by the country for
which the vehicle is manufactured. All models built
for sale in North America use a fixed-length stainless
steel rod-type antenna mast. Models built for sale
outside North America use a power-operated tele-
scoping-type antenna, extended and retracted by a
reversible electric motor. Either antenna type is
mounted on 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 end of the instrument
panel at the right cowl side panel. This additional
disconnect allows the instrument panel assembly to
be removed and installed without removing the radio.
The power antenna is designed to raise automati-
cally when both the ignition switch and the radio are
turned on. When the ignition switch is turned to the
Off position, the antenna will automatically retract.
When the ignition switch is turned to the On position
and the radio is turned off, the antenna will remain
in its retracted position.
The power antenna is controlled by a combination
of an external power antenna relay located in the
junction block, and two limit switches that are built
into the antenna motor housing. There is a gear-op-
erated cam system to activate the limit switches. The
limit switches are used to open the motor circuits
when the antenna mast reaches its fully-extended or
fully-retracted positions.
When the radio or ignition switch is turned off, the
power antenna relay coil is de-energized. With the
coil de-energized, battery voltage switches to the
motor through the closed lower limit switch. The
antenna then retracts until the lower limit switch
opens. The antenna cannot be adjusted to an inter-
mediate position. It must be fully-extended or fully-
retracted. The power antenna unit cannot be
repaired and, if faulty or damaged, the entire assem-
bly must be replaced.
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.
ANTENNA RELAY
The antenna relay is a International Standards
Organization (ISO)-type relay. The antenna relay is a
electromechanical device that switches battery cur-
AUDIO SYSTEMS 8F - 3