Speaker Malfunction
Speaker Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier (if equipped) have a DC bias voltage that is approximately one half of battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5 V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. The frequency (Hz) of the AC voltage signal is directly related to the frequency of the input (audio source playing) to the audio system. Both the DC bias voltage and the AC voltage signals are needed for the audio system to properly produce sound.
Diagnostic Aids
* Improper speaker mounting or loose trim may cause an audible buzz or distortion. Inspect the appropriate speaker and the surrounding interior trim for proper and secure mounting.
The EL-50334-6 Audio System Diagnostic CD contains audio tracks that can be used to duplicate and isolate such concerns. Tracks 11 and 12 contain audio sweep tones for testing for speaker and grill rattles.
If the speaker or surrounding interior trim is found to be loose or improperly secured, correctly secure the item.
* When equipped with an amplifier, it is possible for some individual circuit faults to affect more than one speakers operation. Perform diagnostic tests in the sequence listed to avoid misdiagnosis.
* The amplifier control circuit will measure less than 1 V when the mute function is OFF, and approximately 8 V DC when at full mute. When mute is active, the radio stops sending the varying AC voltage to the amplifier/speakers.
Reference Information
Schematic Reference
Radio/Navigation System Schematics Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation
Radio/Audio System Description and Operation Radio/Audio System
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Special Tools
EL-50334-50 - USB Cable and Adapter Kit
Circuit/System Verification
Without Amplifier
Radio ON, Mute OFF, verify clear audio is heard from each audio speaker.
If audio is inoperative from all speakers, replace the radio.
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 - without Amplifier.
With Amplifier
Radio ON, Mute OFF, verify clear audio is heard from each audio speaker.
If audio is not heard from all speakers, or the audio emitted from the speakers is not clear, refer to Speaker Circuit Malfunction- with Amplifier.
Circuit/System Testing
Speaker Malfunction - without Amplifier
Note: In the following tests, audio signal frequencies (Hz) will be tested. To prevent misdiagnosis, the door chime must be OFF during testing. Ensure the driver door latch is closed during testing.
1. Vehicle OFF, disconnect the harness connector at the appropriate P19 speaker. Vehicle in Service Mode, radio ON, mute OFF.
2. Test for 5-7 V between each audio signal circuit terminal 1 and terminal 2 and ground.
• If less than 5 V
1. Vehicle OFF, disconnect the X1 harness connector at the A11 radio.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the A11 radio.
• If greater than 7 V
1. Vehicle OFF, disconnect the X1 harness connector at the A11 radio. Vehicle in Service Mode.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the A11 radio.
• If between 5-7 V
3. Insert the EL-50334-6 Audio Test CD from the EL-50334-50 - USB cable and adapter kit. Play track number three (50 Hz bass test tone) from the test CD.
4. Test for 49-51 Hz AC between each signal circuit terminal 1 and terminal 2 and ground.
• If not between 49-51 Hz AC
Replace the A11 radio.
• If between 49-51 Hz AC
5. Test or replace the P19 speaker.
Speaker Malfunction- with Amplifier
1. Vehicle OFF, disconnect the X1 harness connector at the T3 audio amplifier.
2. Test for less than 10 ohms between the ground circuit terminal 8 and ground.
• If 10 ohms or greater
1. Vehicle OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Vehicle OFF.
2. Test for less than 2 ohms in the B+ circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, refer to Power Mode Mismatch Power Mode Mismatch.
• If the test lamp does not illuminate and the circuit fuse is open
1. Vehicle OFF.
2. Test for infinite resistance between the B+ circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the T3 audio amplifier.
• If the test lamp illuminates
4. Disconnect the X2 harness connector at the T3 audio amplifier.
5. Verify a test lamp does not illuminate between the control circuit terminal 14 and ground.
• If the test lamp illuminates
1. Disconnect the X1 harness at the A11 radio.
2. Verify a test lamp does not illuminate between the control circuit and ground.
• If the test lamp illuminates, repair the short to voltage on the circuit.
• If the test lamp does not illuminate, replace the A11 radio.
• If the test lamp does not illuminate
6. Vehicle in Service Mode, A11 radio ON.
7. Verify a test lamp illuminates between the control circuit terminal 14 and ground.
• If the test lamp does not illuminate
1. Vehicle OFF. Disconnect the X1 harness at the A11 radio.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the A11 radio.
• If the test lamp illuminates
8. Radio ON, mute ON.
9. Test for 7.5-8.5 V between the control circuit terminal 12 and ground.
• If greater than 8.5 V
1. Vehicle OFF, disconnect the X1 harness connector at the A11 radio. Vehicle in Service Mode.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the A11 radio.
• If less than 7.5 V
1. Vehicle OFF, disconnect the X1 harness connector at the A11 radio.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the A11 radio.
• If between 7.5-8.5 V
10. Radio ON, mute OFF.
11. Test for less than 1 V between the control circuit terminal 12 and ground.
• If greater than 1 V
Replace the A11 radio.
• If less than 1 V
12. Vehicle OFF, disconnect the X3 harness connector at the T3 audio amplifier.
13. Vehicle in Service Mode, A11 radio ON.
14. Test for 5-7 V between the signal circuit terminals listed below and ground:
* Left front low level audio signal (+) terminal 14
* Left front low level audio signal (-) terminal 6
* Right front low level audio signal (+) terminal 5
* Right front low level audio signal (-) terminal 13
* Left rear low level audio signal (+) terminal 12
* Left rear low level audio signal (-) terminal 4
* Right rear low level audio signal (+) terminal 3
* Right rear low level audio signal (-) terminal 11
• If less than 5 V
1. Vehicle OFF, disconnect the X1 harness connector at the A11 radio.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the A11 radio.
• If greater than 7 V
1. Vehicle OFF, disconnect the X1 harness connector at the A11 radio. Vehicle in Service Mode.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the A11 radio.
• If between 5-7 V
15. Insert the EL-50334-6 Audio Test CD from the EL-50334-50 - USB cable and adapter kit. Play track number three (50 Hz bass test tone) from the test CD.
16. Test for 49-51 Hz AC between the audio signal circuit terminals listed below and ground:
* Left front low level audio signal (+) terminal 14
* Left front low level audio signal (-) terminal 6
* Right front low level audio signal (+) terminal 5
* Right front low level audio signal (-) terminal 13
* Left rear low level audio signal (+) terminal 12
* Left rear low level audio signal (-) terminal 4
* Right rear low level audio signal (+) terminal 3
* Right rear low level audio signal (-) terminal 11
• If not between 49-51 Hz AC
Replace the A11 radio.
• If between 49-51 Hz AC
17. Vehicle OFF, connect all harness connectors.
18. Disconnect the harness connector at the appropriate P19 speaker. Vehicle in Service Mode, A11 radio ON.
19. Test for 5-7 V between the appropriate signal circuit terminals listed below and ground:
* Door speaker or tweeter speaker signal (+): terminal 2
* Door speaker or tweeter speaker signal (-): terminal 1
* Subwoofer speaker signal (+) terminal B
* Subwoofer speaker signal (-) terminal A
• If less than 5 V
1. Vehicle OFF, disconnect the X3 harness connector at the T3 audio amplifier.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the T3 audio amplifier.
• If greater than 7 V
1. Vehicle OFF, disconnect the X3 harness connector at the T3 audio amplifier. Vehicle in Service Mode.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the T3 audio amplifier.
• If between 5-7 V
Note: In the following tests, audio signal frequencies (Hz) will be tested. To prevent misdiagnosis, the door chime must be OFF during testing. Ensure the driver door latch is closed during testing.
20. Mute OFF, play track number three (50 Hz bass test tone) from the test CD.
21. Test for 49-51 Hz AC between the appropriate signal circuit terminals listed below and ground:
* Door speaker or tweeter speaker signal (+): terminal 2
* Door speaker or tweeter speaker signal (-): terminal 1
* Subwoofer speaker signal (+) terminal B
* Subwoofer speaker signal (-) terminal A
• If not between 49-51 Hz AC
Replace the T3 audio amplifier.
• If between 49-51 Hz AC
22. Test or replace the P19 speaker.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Speaker Replacement Reference Speaker Replacement Reference
* Control Module References Programming and Relearning for amplifier or radio replacement, programming and setup