Dodge 2000 DURANGO Service Manual page 349

DN
DIAGNOSIS AND TESTING (Continued)
The ohmmeter test lead connections for each test
are shown in Antenna Tests (Fig. 3).
NOTE: This model has a special coating on the
antenna mast which is not electrically conductive.
Remove the antenna mast from the antenna base
before attempting to perform Tests 1 and 2.
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 inboard side of the glove
box opening to the antenna base, and then from the
coaxial cable connection to the radio chassis con-
nection.
Fig. 3 Antenna Tests
TEST 1
Test 1 determines if the antenna mast is insulated
from the base. Proceed as follows:
(1) Disconnect the antenna coaxial cable connector
from the radio receiver chassis and isolate. Remove
the antenna mast from the antenna base.
(2) Insert one ohmmeter test lead into the socket
for the antenna mast in the center of the antenna
base. Connect the other test lead to the perimeter of
the antenna base. Check for continuity.
(3) There should be no continuity. If continuity is
found, replace the faulty or damaged antenna base
and cable assembly.
TEST 2
Test 2 checks the antenna for an open circuit as
follows:
(1) Disconnect the antenna coaxial cable connector
from the radio receiver chassis. Remove the antenna
mast from the antenna base.
(2) Insert one ohmmeter test lead into the socket
for the antenna mast in the center of the antenna
base. Connect the other test lead to the center pin of
the antenna coaxial cable connector.
(3) Continuity should exist (the ohmmeter should
only register a fraction of an ohm). High or infinite
resistance indicates damage to the base and cable
assembly. Replace the faulty base and cable, if
required.
TEST 3
Test 3 checks the condition of the vehicle body
ground connection. This test should be performed
with the battery positive cable removed from the bat-
tery. Disconnect both battery cables, the negative
cable first. Reconnect the battery negative cable and
perform the test as follows:
(1) Connect one ohmmeter test lead to the vehicle
fender. Connect the other test lead to the battery
negative terminal post.
(2) The resistance should be less than one ohm.
(3) If the resistance is more than one ohm, check
the braided ground strap(s) connected to the engine
and the vehicle body for being loose, corroded, or
damaged. Repair the ground strap connections, if
required.
TEST 4
Test 4 checks the condition of the ground between
the antenna base and the vehicle body as follows:
(1) Connect one ohmmeter test lead to the vehicle
fender. Connect the other test lead to the outer crimp
on the antenna coaxial cable connector.
(2) The resistance should be less then one ohm.
(3) If the resistance is more then one ohm, clean
and/or tighten the antenna base to fender mounting
hardware.
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.
AUDIO SYSTEMS
GROUP 8M - PASSIVE
STEERING COLUMN,
8F - 9
OR