Dodge Ram. Manual — part 55
Symptom:
LEFT REAR INPUT NO ACTIVITY
When Monitored and Set Condition:
LEFT REAR INPUT NO ACTIVITY
When Monitored:
When the DRBIII
t performs the amplifier Input Test.
Set Condition:
The Amplifier detects no activity on the input circuit.
POSSIBLE CAUSES
(+) CIRCUIT SHORTED TO GROUND
(-) CIRCUIT SHORTED TO GROUND
OPEN SPEAKER CIRCUITS
AMPLIFIER
RADIO
TEST
ACTION
APPLICABILITY
1
NOTE: The fault condition must be present to continue diagnosis. Use the
DRBIII
t to perform the Amplifier pretest to verify the fault condition is
present before continuing diagnosis.
Turn the ignition off.
Disconnect the Amplifier C1 harness connector.
Disconnect the Radio harness connector.
Measure the resistance between ground and the left rear speaker (+) circuit.
Is the resistance below 1000.0 (1K) ohms?
All
Yes
→ Repair the speaker (+) circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the Amplifier C1 harness connector.
Disconnect the Radio harness connector.
Measure the resistance between ground and the left rear speaker (-) circuit.
Is the resistance below 1000.0 (1K) ohms?
All
Yes
→ Repair the speaker (-) circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
217
AUDIO
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Amplifier C1 harness connector.
Disconnect the Radio harness connector.
Measure the resistance of each left rear speaker (+) and (-) circuit between the Radio
and the Amplifier.
Is the resistance below 5.0 ohms for each circuit?
All
Yes
→ Go To 4
No
→ Repair the speaker circuits for an open.
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Reconnect the Radio harness connector.
Disconnect the Amplifier C1 harness connector.
Turn the ignition on and the Radio on to a known good radio station or have a tape
or CD playing.
Turn the radio volume control up at least 25 positions.
With the voltmeter in the AC voltage scale, measure the voltage of each left rear
speaker circuit at the Amplifier C1 connector.
NOTE: Perform this test on each left rear speaker circuit.
Is the voltage at least 120mV AC (0.12 VAC) on each speaker circuit?
All
Yes
→ Replace the Amplifier in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Radio.
Perform BODY VERIFICATION TEST - VER 1.
218
AUDIO
LEFT REAR INPUT NO ACTIVITY —
Continued
Symptom:
LOW VOLTAGE LEVEL
When Monitored and Set Condition:
LOW VOLTAGE LEVEL
When Monitored:
Set Condition:
The radio detects lower than normal voltage.
POSSIBLE CAUSES
CHECK CHARGING SYSTEM
CHECK VOLTAGE LEVEL AT RADIO
RADIO
TEST
ACTION
APPLICABILITY
1
Check the charging system in accordance with the service information.
Is the charging system operating properly?
All
Yes
→ Go To 2
No
→ Refer to the appropriate service information and repair as neces-
sary.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Radio harness connector.
Start the engine.
Measure the voltage of each Fused B+ circuit and the Fused Ignition Switch Output
circuit.
Is the voltage above or approximately 14 volts for each measurement?
All
Yes
→ Go To 3
No
→ Repair the circuit for high resistance.
Perform BODY VERIFICATION TEST - VER 1.
3
Note: Reconnect all previously disconnected components.
Turn the ignition and Radio on.
With the DRBIII
t, erase the audio DTC’s.
Start the engine.
With the DRBIII
t, read the audio DTC’s.
Did this DTC reset?
All
Yes
→ Replace the Radio.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
219
AUDIO
Symptom:
NO ANTENNA CONNECTION
When Monitored and Set Condition:
NO ANTENNA CONNECTION
When Monitored:
With the ignition on and the radio in seek up/down mode.
Set Condition:
With the radio in seek or scan mode for two minutes and the radio does not
detect an antenna connection or does not receive a radio station signal.
POSSIBLE CAUSES
BAD ANTENNA CONNECTION
TEST ANTENNA
RADIO
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Radio Antenna connector.
Inspect the Radio Antenna connection.
Was the Antenna connection clean and tight?
All
Yes
→ Go To 2
No
→ Repair Antenna connection as needed.
Perform BODY VERIFICATION TEST - VER 1.
2
Refer to the Audio System in the service information and test the Antenna in
accordance with the service procedure.
Is the Antenna ok?
All
Yes
→ Go To 3
No
→ Repair or replace the Antenna assembly as necessary.
Perform BODY VERIFICATION TEST - VER 1.
3
NOTE: Reconnect all previously disconnected components.
Turn the ignition and Radio on.
NOTE: Move vehicle outside approximately 30ft from any structure.
With the DRBIII
t, erase the audio DTC’s, put the radio in seek up and seek down
mode for approximately 2 minutes before proceeding.
With the DRBIII
t, read the audio DTC’s.
Did this DTC reset?
All
Yes
→ Replace the Radio.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
220
AUDIO
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