Antenna Tests - Typical - Chrysler Sebring 2004 Service Manual

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ANTENNA BODY & CABLE (Continued)
Fig. 1 ANTENNA TESTS - TYPICAL
and tested individually to locate the exact component
that is the source of the short circuit. To begin this
test, proceed as follows:
(1) Disconnect the instrument panel (secondary)
antenna cable coaxial connector from the back of the
radio.
(2) Touch one ohmmeter test lead to the shield
ground of the coaxial cable. Touch the other test lead
to the center conductor pin of the instrument panel
antenna cable coaxial connector for the radio. Check
the ohmmeter reading for continuity.
(3) There should be no continuity. The ohmmeter
should register an open circuit. Low resistance indi-
cates a damaged or shorted antenna conductor. If
OK, go to Test 2. If not OK, isolate and test each of
the individual antenna
Replace only the faulty antenna conductor compo-
nent.
TEST 2
Remove antenna mast or unplug antenna
cable to perform this test.
Test 2 checks the antenna conductor components
for an open circuit. This test should be performed
first on the entire antenna circuit, from the antenna
mast to the center conductor of the coaxial cable con-
nector at the radio. If an open circuit is detected,
each of the three antenna conductor components
(antenna mast, antenna body and primary cable unit,
instrument panel antenna secondary cable) should be
isolated and tested individually to locate the exact
component that is the source of the open circuit. To
begin this test, proceed as follows:
(1) Disconnect the instrument panel (secondary)
antenna cable coaxial connector from the back of the
radio.
(2) Touch one ohmmeter test lead to the tip of the
antenna mast. Touch the other test lead to the center
conductor pin of the instrument panel antenna cable
conductor components.
coaxial connector for the radio. Check the ohmmeter
reading for continuity.
(3) There should be continuity. The ohmmeter
should register only a fraction of an ohm resistance.
High or infinite resistance indicates a damaged or
open antenna conductor. If OK, go to Test 3. If not
OK, isolate and test each of the individual antenna
conductor components. Replace only the faulty
antenna conductor component.
TEST 3
Test 3 checks the condition of the vehicle body
ground connection. To begin this test, proceed as fol-
lows:
(1) This test must be performed with the battery
positive cable disconnected from the battery. Discon-
nect and isolate both battery cables, negative cable
first.
(2) Reconnect the battery negative cable.
(3) Touch one ohmmeter test lead to a good clean
ground point on the vehicle fender. Touch the other
test lead to the battery negative terminal post. Check
the ohmmeter reading for continuity.
(4) There should be continuity. The ohmmeter
should register less than one ohm resistance. High or
infinite resistance indicates a loose, corroded, or
damaged connection between the battery negative
terminal and the vehicle body. If OK, go to Test 4. If
not OK, check the battery negative cable connection
to the vehicle body and the radio noise suppression
ground strap connections to the engine and the vehi-
cle body for being loose or corroded. Clean or tighten
these connections as required.
TEST 4
Test 4 checks the condition of the connection
between the antenna coaxial cable shield and the
vehicle body ground as follows:
(1) Disconnect and isolate the antenna coaxial
cable connector just in front of the front seat cross-
member of the passenger seat.
(2) Touch one ohmmeter test lead to a good clean
ground point on the vehicle fender. Touch the other
test lead to the outer crimp on the antenna coaxial
cable connector just in front of the front seat cross-
member of the passenger seat. Check the ohmmeter
reading for continuity.
(3) There should be continuity. The ohmmeter
should register less than one ohm resistance. High or
infinite resistance indicates a loose, corroded, or
damaged connection between the antenna body and
the vehicle body or between the antenna body and
the antenna coaxial cable shield. If not OK, clean the
antenna body to fender mating surfaces and tighten
the antenna cap nut to specifications.
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