Speaker Malfunction

Speaker Malfunction

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.



Diagnostic Fault Information






Circuit/System Description

Each audio output channel circuit (+) and (-) at the radio and amplifier (if equipped), have a DC bias voltage that is one half of the battery voltage. The audio output channel circuits will measure approximately 6.5 volts 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 1-3 volts AC when using a DMM. The AC voltage is what causes the speaker cones to move and produce 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 1 volt AC and less, where constant music may measure 3 volts AC and slightly higher.


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

Radio ON, verify clear audio is heard from each audio speaker.

If audio is inoperative from all speakers, refer to Amplifier Circuit Malfunction.
If audio is inoperative from one or more, but not all, speakers or the audio emitted from the speakers is not clear, refer to Speaker Circuit Malfunction.



Circuit/System Testing


Amplifier Circuit Malfunction
1. Ignition OFF, disconnect the X2 harness connector at the audio amplifier.
2. Ignition OFF, test for less than 10 ohms between the ground circuit terminal 2 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, test for B+ on the B+ circuit terminal 1 and ground.

• If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance.

4. Radio ON, test for 0.6-1.0 volts between the amplifier control circuit terminal 11 and ground.

• If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the radio.
• If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

5. If all circuits test normal, replace the audio amplifier.



Speaker Circuit Malfunction
1. Ignition OFF, inspect the appropriate speaker and the surrounding interior trim for proper and secure mounting. Improper speaker mounting or loose trim may cause an audible buzz or distortion.

• If the speaker or surrounding interior trim is found to be loose or improperly secured, correctly secure the item.

2. Disconnect the X1 harness connector at the audio amplifier.
3. Ignition ON, radio ON, test for 5.0-7.5 volts between the appropriate audio signal circuit terminal listed below and ground.

* Left front low level (+) - Connector X1, terminal 1
* Left front low level (-) - Connector X1, terminal 17
* Right front low level (+) - Connector X1, terminal 2
* Right front low level (-) - Connector X1, terminal 18
* Left rear low level (+) - Connector X1, terminal 5
* Left rear low level (-) - Connector X1, terminal 21
* Right rear low level (+) - Connector X1, terminal 6
* Right rear low level (-) - Connector X1, terminal 22
* Center channel low level (+) - Connector X1, terminal 3
* Center channel and subwoofer low level audio common (-) - Connector X1, terminal 19
* Sub woofer low level (+) - Connector X1, terminal 4


• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

4. Ignition OFF, connect the X1 harness connector at the audio amplifier.
5. Disconnect the X2 harness connector at the audio amplifier.
6. Ignition ON, test for less than 1 volt between each speaker signal circuit terminal 1 - 38 and ground.

• If greater than the specified range, test the signal circuit for a short to voltage.

7. Ignition OFF, test for infinite resistance between each speaker signal circuit terminal 1 - 38 and ground.

• If less than the specified range, test the signal circuit for a short to ground.

8. Reconnect all harness connectors at the amplifier. Disconnect the harness connector at the appropriate speaker.
9. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminals listed below and ground.

* Center console speaker- terminal A and B
* Center I/P speaker- terminal A and B
* Driver seat left- terminal A and B
* Driver seat right- terminal A and B
* Front tweeters- terminal A and B
* Front speakers- terminal A and B
* Front subwoofer speakers- terminal D and E
* Rear compartment speakers - terminal A and B
* Rear speakers- terminal A and B
* Passenger seat left speaker - terminal A and B
* Passenger seat right speaker - terminal A and B
* Rear subwoofer - terminal Dand E


• If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the amplifier.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the amplifier.

10. If all circuits test normal, replace the speaker.



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 Audio Amplifier and Radio replacement, setup, and programming