Jeep Cherokee 2000 Service Manual - page 406
OK, replace the faulty speaker. If not OK, repair the
open circuit(s) as required.
(6) For each inoperative speaker location, check for
continuity between the speaker feed (+) circuit cavi-
ties of the radio wire harness connectors and the
amplifier wire harness connectors. Repeat the check
for each inoperative speaker location between the
speaker return (–) circuit cavities of the radio wire
harness connectors and the amplifier wire harness
connectors. In each case, there should be continuity.
If OK, go to Step 7. If not OK, repair the open circuit
as required.
(7) Check for continuity between the two ground
circuit cavities of the amplifier wire harness connec-
tor and a good ground. There should be continuity. If
OK, go to Step 8. If not OK, repair the open circuit(s)
as required.
(8) Check the amplifier fuse in the junction block.
If OK, go to Step 9. If not OK, repair the shorted cir-
cuit or component as required and replace the faulty
fuse.
(9) Install the radio. Connect the battery negative
cable. Check for battery voltage at the amplifier fuse
in the junction block. If OK, go to Step 10. If not OK,
repair the open circuit to the PDC as required.
(10) Check for battery voltage at the two fused
B(+) circuit cavities of the amplifier wire harness
connector. If OK, go to Step 11. If not OK, repair the
open circuit to the fuse in the junction block as
required.
(11) Turn the ignition switch to the On position.
Turn the radio on. Check for battery voltage at the
radio 12 volt output circuit cavity of the amplifier
wire harness connector. If OK, go to Step 12. If not
OK, repair the open circuit to the radio as required.
(12) Turn the radio off. Turn the ignition switch to
the Off position. Disconnect and isolate the battery
negative cable. For each inoperative speaker location,
check both the amplified feed (+) circuit and the
amplified return (–) circuit cavities of the amplifier
wire harness connectors for continuity to ground. In
each case there should be no continuity. If OK, go to
Step 13. If not OK, repair the short circuit as
required.
(13) For each inoperative speaker location, check
the resistance between the amplified feed (+) circuit
and the amplified return (–) circuit cavities of the
amplifier wire harness connectors. The meter should
read between 2 and 12 ohms (speaker resistance). If
OK, replace the faulty amplifier. If not OK, go to
Step 14.
(14) Unplug the speaker wire harness connector at
the
inoperative
speaker.
Check
for
continuity
between the amplified feed (+) circuit cavities of the
speaker wire harness connector and the amplifier
wire harness connector. Repeat the check between
the amplified return (–) circuit cavities of the speaker
wire harness connector and the amplifier wire har-
ness connector. In each case there should be continu-
ity. If OK, replace the faulty speaker. If not OK,
repair the open circuit as required.
ANTENNA
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.
The following four tests are used to diagnose the
antenna with an ohmmeter:
•
Test 1 - Mast to ground test
•
Test 2 - Tip-of-mast to tip-of-conductor test
•
Test 3 - Body ground to battery ground test
•
Test 4 - Body ground to coaxial shield test.
The ohmmeter test lead connections for each test
are shown in Antenna Tests (Fig. 1).
NOTE: This model has a two-piece antenna coaxial
cable. Tests 2 and 4 must be conducted in two
steps to isolate a coaxial cable problem; from the
coaxial cable connection under the right end of the
instrument panel near the right cowl side inner
panel to the antenna base, and then from the coax-
ial cable connection to the radio chassis connec-
tion.
Fig. 1 Antenna Tests
XJ
AUDIO SYSTEMS
8F - 5
DIAGNOSIS AND TESTING (Continued)