Dodge ZB 2005 Service Manual page 230

ZB
SPEAKER (Continued)
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) Turn the ignition switch to the On position.
Turn the radio receiver on. Adjust the balance and
fader controls to check the performance of each indi-
vidual speaker. Note the speaker locations that are
not performing correctly. Go to Step 2.
NOTE: Subwoofer channel will not fade forward or
rearward. Use the bass control to check the sub-
woofer channel output.
(2) Turn the radio receiver off. Turn the ignition
switch to the Off position. Disconnect and isolate the
battery negative cable. Remove the radio receiver
from the instrument panel. Disconnect the wire har-
ness connector at the power amplifier. Check both
the speaker feed (+) circuit and return (–) circuit cav-
ities for the inoperative speaker location(s) at the
radio receiver wire harness connectors for continuity
to ground. In each case, there should be no continu-
ity. If OK, go to Step 3. If not OK, repair the shorted
speaker feed (+) and/or return (–) circuit(s) to the
speaker as required.
(3) For each inoperative speaker location, check for
continuity between the speaker feed (+) circuit cavi-
ties of the radio receiver wire harness connectors and
the power amplifier wire harness connectors. Repeat
the check for each inoperative speaker location
between the speaker return (–) circuit cavities of the
radio receiver wire harness connectors and the power
amplifier wire harness connectors. In each case,
there should be continuity. If OK, go to Step 4. If not
OK, repair the open speaker feed (+) and/or return
(–) circuit(s) as required.
(4) Check for continuity between the two ground
circuit cavities of the power amplifier wire harness
connector and a good ground. There should be conti-
nuity. If OK, go to Step 5. If not OK, repair the open
ground circuit(s) to ground as required.
(5) Install the radio receiver. Connect the battery
negative cable. Check for battery voltage at the fused
B(+) fuse for the power amplifier in the Power Dis-
tribution Center (PDC). If OK, go to Step 6. If not
OK, repair the open fused B(+) circuit to the PDC
fuse as required.
(6) Check for battery voltage at the two fused B(+)
circuit cavities of the power amplifier wire harness
connector. If OK, go to Step 7. If not OK, repair the
open fused B(+) circuit(s) to the power amplifier fuse
in the junction block as required.
(7) Turn the ignition switch to the On position.
Turn the radio receiver on. Check for battery voltage
at the enable signal to amplifier circuit cavity of the
power amplifier wire harness connector. If OK, go to
Step 8. If not OK, repair the open enable signal to
amplifier circuit to the radio receiver as required.
(8) Turn the radio receiver 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 power
amplifier wire harness connectors for continuity to
ground. In each case there should be no continuity. If
OK, go to Step 9. If not OK, repair the shorted
amplified feed (+) and/or amplified return (–) cir-
cuit(s) to the speaker as required.
(9) Disconnect 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 power ampli-
fier wire harness connector. Repeat the check
between the amplified return (–) circuit cavities of
the speaker wire harness connector and the power
amplifier wire harness connector. In each case there
should be continuity. If OK, replace the faulty
speaker. If not OK, repair the open amplified feed (+)
and/or amplified return (–) circuit(s) as required. If
condition is still present, go to Step 10.
(10) For each inoperative speaker location, check
the resistance between the amplified feed (+) circuit
and the amplified return (–) circuit cavities of the
power amplifier wire harness connectors. The meter
should read between 3 and 5 ohms (speaker resis-
tance). If OK, replace the faulty power amplifier.
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