Speakers Inoperative - One or More

Speakers Inoperative - One or More

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

Circuit/System Description

Each of the audio output channel circuits (+) and (-), at the radio and at the amplifier if equipped, have a DC bias voltage that is one half of the battery voltage. Therefore each of the audio output channel circuits will measure approximately 6.5V DC when using a DMM. The audio music or talking being played on the audio system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage measured on these circuits on the output of a radio that is not amplified will be approximately 1-3V AC when using a DMM. The AC voltage is what causes the speaker cone to move and produce the sound. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, and the volume setting of the system. Low volume and talk settings will measure around 1V AC and less, where constant music may measure 3V AC and slightly higher. In an amplified audio system, these similar AC voltage measurements may be slightly higher on the output of the amplifier, and the typical AC voltage readings at the output of the radio are less than 1V AC.

Diagnostic Aids

Speakers located in the front A-pillar are connected to the same channel as the speakers in the front doors.

Reference Information
Schematic Reference

Radio/Navigation System Schematics (Radio/Navigation System Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Radio/Audio System Description and Operation (Radio/Audio System Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for Scan Tool information

Circuit/System Verification

Adjust the fade and balance controls on the radio to test all four channels individually. All speakers should function properly.

Circuit/System Testing Only

Digital Radio One or More Speakers Inoperative
1. Ignition OFF, disconnect the radio X2 harness connector.
2. Ignition ON, digital radio ON and tuned to a station, increase the radio volume.
3. Verify AC voltage is not present on the suspect channel audio signal (+) and audio signal (-) from the DRR.

• If AC voltage is present, replace the radio.

4. Ignition OFF, disconnect the digital radio harness connector.
5. Test for less than 1 volt on both suspect audio signal (+) and audio signal (-).

• If greater than 1 volt repair short to voltage.

6. Test for less than 1 ohm on the suspect audio signal (+) between the radio harness connector and the digital radio X2 harness connector.

• If greater than specified value repair open or high resistance.

7. Test for less than 1 ohm on the suspect audio signal (-) between the radio harness connector and the digital radio X2 harness connector.

• If greater than specified value repair open or high resistance.

8. If all circuits test normal, replace the digital radio receiver (DRR).

One or More Speakers Inoperative With Amplifier
1. Center the balance and fade adjustment on the radio.

• If adjustment of the fade and balance eliminates the concern, review the operation of the radio with the customer.

2. Ignition OFF, Disconnect the suspect amplifier harness connector. If the suspect speaker inputs are contained in the same harness as the battery positive voltage circuit, the ground circuit, the radio amp mute signal, and the antenna switched 14-volt supply circuit. It will be required to re-connect the applicable circuits by using a fused jumper harness.
3. Ignition ON, operate the radio and increase the radio volume.
4. Verify AC voltage is present between the suspect speaker output (+) and speaker output (-) circuits.

• If AC voltage is present, replace the amplifier.

5. Reconnect the amplifier harness connector.
6. Disconnect the suspect speaker harness connector.
7. Verify AC voltage is present between the suspect speaker output (+) and speaker output (-) circuits.

• If AC voltage is present, replace the suspect speaker.

8. Ignition OFF, disconnect the suspect amplifier harness connector.
9. Test for less than 1 volt on both suspect speaker output (+) and speaker output (-) circuits.

• If greater than 1 volt repair short to voltage.

10. Test for less than 1 ohm between the suspect speaker output (+) radio harness connector terminal and the suspect speaker output (+) speaker harness connector terminal.

• If greater than specified value repair open or high resistance.

11. Test for less than 1 ohm between the suspect speaker output (-) radio harness connector terminal and the suspect speaker output (-) speaker harness connector terminal.

• If greater than specified value repair open or high resistance.

12. If all circuits test normal, replace the amplifier.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Speaker Replacement Reference (Speaker Replacement Reference)
* Control Module References (Programming and Relearning) for radio or amplifier replacement, setup, and programming