Dodge Ram Truck 1500-2500-3500. Manual — part 261

RIGHT REAR INPUT NO ACTIVITY

For the Audio system circuit diagram (Refer to 8 - ELECTRICAL/AUDIO - SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

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

AMPLIFIER

OPEN SPEAKER CIRCUITS

1.

(+) CIRCUIT SHORTED TO GROUND

NOTE: 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 right rear speaker (+) circuit.

Is the resistance below 1000.0 (1K) ohms?

Yes

>> Repair the speaker (+) circuit for a short to ground.

Perform BODY VERIFICATION TEST - VER 1.

No

>> Go To 2

2.

(-) CIRCUIT SHORTED TO GROUND

Turn the ignition off.

Disconnect the Amplifier C1 harness connector.

Disconnect the Radio harness connector.

Measure the resistance between ground and the right rear speaker (-) circuit.

Is the resistance below 1000.0 (1K) ohms?

Yes

>> Repair the speaker (-) circuit for a short to ground.

Perform BODY VERIFICATION TEST - VER 1.

No

>> Go To 3

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AUDIO - ELECTRICAL DIAGNOSTICS

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RIGHT REAR INPUT NO ACTIVITY (CONTINUED)

3.

OPEN SPEAKER CIRCUITS

Turn the ignition off.

Disconnect the Amplifier C1 harness connector.

Disconnect the Radio harness connector.

Measure the resistance of each right rear speaker (+) and (-) circuit between the Radio and the Amplifier.

Is the resistance below 5.0 ohms for each circuit?

Yes

>> Go To 4

No

>> Repair the speaker circuits for an open.

Perform BODY VERIFICATION TEST - VER 1.

4.

AMPLIFIER

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 right rear speaker circuit at the Amplifier C1
connector.

NOTE: NOTE: Perform this test on each right rear speaker circuit.

Is the voltage at least 120mV AC (0.12 VAC) on each speaker circuit?

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.

DR/DH

AUDIO - ELECTRICAL DIAGNOSTICS

8A - 47

LOW VOLTAGE LEVEL

For the Audio system circuit diagram (Refer to 8 - ELECTRICAL/AUDIO - SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

Set Condition:
The radio detects lower than normal voltage.

Possible Causes

CHARGING SYSTEM

VOLTAGE LEVEL AT RADIO

RADIO

1.

CHECK CHARGING SYSTEM

Check the charging system in accordance with the service information.

Is the charging system operating properly?

Yes

>> Go To 2

No

>> Refer to the appropriate service information and repair as necessary.

Perform BODY VERIFICATION TEST - VER 1.

2.

CHECK VOLTAGE LEVEL AT RADIO

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 mea-
surement?

Yes

>> Go To 3

No

>> Repair the circuit for high resistance.

Perform BODY VERIFICATION TEST - VER 1.

3.

RADIO

NOTE: 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?

Yes

>> Replace the Radio.

Perform BODY VERIFICATION TEST - VER 1.

No

>> Test Complete.

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AUDIO - ELECTRICAL DIAGNOSTICS

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RADIO AND NAV GPS ANTENNA NOT CONNECTED

For the Audio system circuit diagram (Refer to 8 - ELECTRICAL/AUDIO - SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the radio on

•

Set Condition:
The Radio dectects a improper antenna signal

Possible Causes

BAD ANTENNA CONNECTION

ANTENNA

RADIO

1.

BAD ANTENNA CONNECTION

Turn the ignition off.

Disconnect the Antenna connectors.

Inspect the Antenna connections.

Was the Antenna connections clean and tight?

Yes

>> Go To 2

No

>> Repair the Antenna connections as needed.

Perform BODY VERIFICATION TEST - VER 1.

2.

ANTENNA

Refer to the Audio System in the service information and test the Antennas in accordance with the service proce-
dure.

Are the Antennas ok?

Yes

>> Go To 3

No

>> Repair or replace the Antenna assemblies as necessary.

Perform BODY VERIFICATION TEST - VER 1.

DR/DH

AUDIO - ELECTRICAL DIAGNOSTICS

8A - 49