Jeep 1996 Grand Cherokee Service Manual - page 334
RADIO
For circuit descriptions and diagrams, refer to
8W-47 - Audio System in Group 8W - Wiring Dia-
grams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER
TO
GROUP
8M
-
PASSIVE
RESTRAINT
SYSTEMS
BEFORE
ATTEMPTING
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.
CAUTION: The speaker output of the radio is a
“floating ground” system. Do not allow any speaker
lead to short to ground, as damage to the radio
may result.
(1) Check the fuse(s) in the junction block and the
Power Distribution Center (PDC). If OK, go to Step
2. If not OK, replace the faulty fuse(s).
(2) Check for battery voltage at the fuse in the
PDC. If OK, go to Step 3. If not OK, repair the open
circuit as required.
(3) Turn the ignition switch to the On position.
Check for battery voltage at the fuse in the junction
block. If OK, go to Step 4. If not OK, repair the open
circuit as required.
(4) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the instrument cluster bezel. Remove the
radio, but do not unplug any connections. Check for
continuity between the radio chassis and a good
ground. There should be continuity. If OK, go to Step
5. If not OK, repair the open circuit as required.
(5) Connect the battery negative cable. Turn the
ignition switch to the On position. Check for battery
voltage at the fused ignition switch output circuit
cavity of the left (gray) radio connector. If OK, go to
Step 6. If not OK, repair the open circuit as required.
(6) Turn the ignition switch to the Off position.
Check for battery voltage at the fused B(+) circuit
cavity of the left (gray) radio connector. If OK,
replace the faulty radio. If not OK, repair the open
circuit as required.
REMOTE RADIO SWITCHES
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER
TO
GROUP
8M
-
PASSIVE
RESTRAINT
SYSTEMS
BEFORE
ATTEMPTING
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.
(1) Disconnect and isolate the battery negative
cable. Wait two minutes for the airbag system capac-
itor to discharge before further service.
(2) Remove the remote radio switches as described
in this group.
(3) Use an ohmmeter to check the switch resis-
tance as shown in the Remote Radio Switch Test
chart.
(4) If the switch checks OK, go to Step 5. If not
OK, replace the faulty switch.
(5) Check for continuity between the ground cir-
cuit cavity of the switch connector and a good
ground. There should be continuity. If OK, go to Step
6. If not OK, repair the open circuit as required.
(6) Unplug the 24-way white connector from the
Body Control Module (BCM). Check for continuity
between the radio control mux circuit cavity of the
remote radio switch connector and a good ground.
There should be no continuity. If OK, go to Step 7. If
not OK, repair the short circuit as required.
(7) Check for continuity between the radio control
mux circuit cavities of the remote radio switch and
the BCM connectors. There should be continuity. If
OK, refer to the proper Body Diagnostic Procedures
Manual to test the BCM and the CCD data bus. If
not OK, repair the open circuit as required.
SPEAKERS
For circuit descriptions and diagrams, refer to
8W-47 - Audio System in Group 8W - Wiring Dia-
grams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER
TO
GROUP
8M
-
PASSIVE
RESTRAINT
SYSTEMS
BEFORE
ATTEMPTING
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.
Remote Radio Switch Test
Switch Position
Resistance
Volume Up
7320 Ohms
Volume Down
1210 Ohms
Seek Up
4530 Ohms
Seek Down
2050 Ohms
Pre-Set Station Advance
10 Ohms
ZJ
AUDIO SYSTEMS
8F - 5
DIAGNOSIS AND TESTING (Continued)