Radio Frequency Interference; Radio; Service Procedures; Antitheft Security Code - Jeep 1997 Grand Cherokee Service Manual

8F - 10 AUDIO SYSTEMS
DIAGNOSIS AND TESTING (Continued)

RADIO FREQUENCY INTERFERENCE

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING WHEEL,
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
Inspect the ground connections at the following:
• Blower motor
• Electric fuel pump
• Generator
• Ignition module
• Wiper motor
• Antenna coaxial ground
• Radio ground
• Body-to-engine braided ground strap (if the vehi-
cle is so equipped).
Clean, tighten, or repair the connections as
required.
Also inspect the following secondary ignition sys-
tem components, as described in Group 8D - Ignition
Systems:
• Spark plug wire routing and condition
• Distributor cap and rotor
• Ignition coil
• Spark plugs.
Reroute the spark plug wires or replace the faulty
components as required.

SERVICE PROCEDURES

ANTITHEFT SECURITY CODE

Certain export models equipped with the RBL
sales code radio have a radio antitheft security code
feature. This feature requires that a security code be
entered into the radio following a battery disconnect
in order for the radio to become operational. When
the radio is new, a label identifying the four-digit
security code is affixed to the radio faceplate. It is
recommended that the vehicle owner note this secu-
rity code in his vehicle owner's manual for future ref-
erence, then remove and destroy the security code
label. To enter the security code in the radio, proceed
as follows:
(1) Turn the ignition switch to the On position.
(2) Momentarily depress the power (PWR) button
on the radio faceplate. The word "code" should
appear on the radio display.
(3) Enter the four-digit radio security code by
depressing the radio station preset buttons in the
proper sequence.
GROUP 8M - PASSIVE
STEERING COLUMN,
(4) The radio is now ready for normal operation.
The security code must be reentered any time the
radio or vehicle is disconnected from battery feed.
If an attempt is made to enter an incorrect security
code into the radio, the radio will become inoperative
and the words "wait 2 hrs" will appear on the radio
OR
display. The ignition switch and the radio power but-
ton must remain in their On positions for two full
and uninterrupted hours, before the word "code" will
reappear in the radio display and the radio will
again accept a security code entry.

REMOVAL AND INSTALLATION

RADIO

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING WHEEL,
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Disconnect and isolate the battery negative
cable.
(2) Using a trim stick or another suitable wide
flat-bladed tool, pry gently around the edges of the
instrument panel switch pod bezels and remove both
bezels.
(3) Remove the ten screws that secure the cluster
bezel to the instrument panel (Fig. 2).
Fig. 2 Cluster Bezel Screws Remove/Install
(4) Pull the cluster bezel rearward and move it
outboard of the steering wheel to remove it from the
vehicle.
(5) Remove the two screws from the front of the
radio that secure it to the instrument panel (Fig. 3).
(6) Pull the radio out from the instrument panel
far enough to unplug the wire harness connectors
and the antenna coaxial cable connector (Fig. 4).
CLUSTER BEZEL SCREWS
TO GROUP 8M -
STEERING COLUMN,
ZG
PASSIVE
OR