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 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.
* The test tones on the CD may be copied to a USB drive or other device to use during testing.
* 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.
* On the base 6 speaker system, the subwoofer is not used for reproducing audio. The subwoofer is used only for producing the cancellation tones for the active noise cancellation system.
On the uplevel speaker system, the subwoofer is used for both reproducing audio and the active noise cancellation system tones.
Reference Information
Schematic Reference
Radio/Navigation System Schematics Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left Front
Description and Operation
Radio/Audio System Description and Operation (with Monochrome Display) Radio/Audio System Description and Operation (with Monochrome Display)Radio/Audio System Description and Operation (with Color Display) Radio/Audio System Description and Operation (with Color Display)
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
1. Ignition ON, A11 radio ON, mute OFF.
2. Verify clear audio is heard from each speaker, adjusting fade and balance controls to test each speaker individually.
• If audio is inoperative from one or more speakers, or the audio emitted is not clear
Refer to Circuit/System Testing.
• If clear audio is heard from all speakers
3. All OK.
Circuit/System Testing
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. Ignition OFF, disconnect the X3 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. Ignition 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. Ignition 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. Ignition 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. Ignition OFF, disconnect the X1 harness connector at the T3 audio amplifier.
5. Verify a test lamp does not illuminate between the control circuit terminal 8 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. Ignition ON, A11 radio ON.
7. Verify a test lamp illuminates between the control circuit terminal 8 and ground.
• If the test lamp does not illuminate
1. Ignition 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 16 and ground.
• If greater than 8.5 V
1. Ignition OFF, disconnect the X1 harness connector at the A11 radio. Ignition ON.
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. Ignition 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 16 and ground.
• If greater than 1 V
Replace the A11 radio.
• If less than 1 V
12. Test for 5-7 V between the signal circuit terminals listed below and ground:
* Left front speaker control (+) terminal 11
* Left front speaker control (-) terminal 12
* Right front speaker control (+) terminal 9
* Right front speaker control (-) terminal 10
* Left rear speaker control (+) terminal 1
* Left rear speaker control (-) terminal 2
* Right rear speaker control (+) terminal 4
* Right rear speaker control (-) terminal 3
• If less than 5 V
1. Ignition 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. Ignition OFF, disconnect the X1 harness connector at the A11 radio. Ignition ON.
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
13. Play track number three (50 Hz bass test tone) from the EL-50344-6 Audio Test CD.
14. Test for 49-51 Hz AC between the audio signal circuit terminals listed below and ground:
* Left front speaker control (+) terminal 11
* Left front speaker control (-) terminal 12
* Right front speaker control (+) terminal 9
* Right front speaker control (-) terminal 10
* Left rear speaker control (+) terminal 1
* Left rear speaker control (-) terminal 2
* Right rear speaker control (+) terminal 4
* Right rear speaker control (-) terminal 3
• If not between 49-51 Hz AC
Replace the A11 radio.
• If between 49-51 Hz AC
15. Ignition OFF, connect all harness connectors.
16. Disconnect the harness connector at the appropriate P19 speaker. Ignition ON, A11 radio ON.
17. Test for 5-7 V between the appropriate control circuit terminals listed below and ground:
* Door speakers or front tweeter speakers: speaker control (-) circuit terminal 1
* Door speakers or front tweeter speakers: speaker control (+) circuit terminal 2
* Center I/P speaker: speaker control (-) circuit terminal 1 (with UZ8)
* Center I/P speaker: speaker control (+) circuit terminal 2 (with UZ8)
* Left subwoofer speaker control (-) circuit terminal A (with UZ8)
* Left subwoofer speaker control (+) circuit terminal B (with UZ8)
* Right subwoofer speaker control (-) circuit terminal C (with UZ8)
* Right subwoofer speaker control (+) circuit terminal D (with UZ8)
• If less than 5 V
1. Ignition OFF, disconnect the X2 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. Ignition OFF, disconnect the X2 harness connector at the T3 audio amplifier. Ignition ON.
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
18. Mute OFF, play track number three (50 Hz bass test tone) from the test CD.
19. Test for 49-51 Hz AC between the appropriate control circuit terminals listed below and ground.
* Door speakers or front tweeter speakers: speaker control (-) circuit terminal 1
* Door speakers or front tweeter speakers: speaker control (+) circuit terminal 2
* Center I/P speaker: speaker control (-) circuit terminal 1 (with UZ8)
* Center I/P speaker: speaker control (+) circuit terminal 2 (with UZ8)
* Left subwoofer speaker control (-) circuit terminal A (with UZ8)
* Left subwoofer speaker control (+) circuit terminal B (with UZ8)
* Right subwoofer speaker control (-) circuit terminal C (with UZ8)
* Right subwoofer speaker control (+) circuit terminal D (with UZ8)
• If not between 49-51 Hz AC
Replace the T3 audio amplifier.
• If between 49-51 Hz AC
20. 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