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Diagnosis And Testing - Speaker

Any diagnosis of the Audio system should begin with the use of a scan tool and the appropriate Diagnostic Service Information. 

Refer to the appropriate wiring information.

WARNING:

Disable the airbag system before attempting any steering wheel, steering column, seat belt tensioner, side airbag or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable. Wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to follow these instructions may result in accidental airbag deployment and possible serious or fatal injury.

CAUTION:

The speaker output of the radio is a "floating ground" system. Do not allow any speaker lead to short to ground, as damage to the radio may result.

multimedia:A supplement to the article is available.

Speaker Buzz, Squeak, Rattle (BSR) Diagnosis and Testing 

  1. Begin by verifying the customer complaint. The exact conditions that caused the issue for the customer must be used. Pay close attention to the following details
    1. Type of input (FM, AM, XM, CD)
    2. Volume Level
    3. Audio settings, including bass and treble
  2. Once the complaint has been reproduced, clear the map pocket and storage bins of all loose items around the speaker in question.
  3. Attempt to reproduce the issue in a non-radio mode, such as CD, Bluetooth®, or Auxiliary Input. This will help determine if it is a speaker issue or a reception issue.
  4. If the speaker noise is still present, visit the Tech Connect home page / Service Library Dashboard and follow the instructions to download the Audio Test Files for Speaker Diagnosis to a USB drive.
  5. Insert the USB drive in the proper input of the vehicle, and then set the following radio settings:
    1. Bass at maximum
    2. Mid and treble at neutral
    3. Volume at step 30
  6. Play all of the frequencies on the USB drive with the recommended settings. When a frequency reproduces the noise, press the interior panels around the speaker to see if the noise subsides. It may be necessary to replace broken trim clips or use foam tape to correct a speaker noise issue. Refer to the service information for additional details.

Electrical Diagnosis and Testing 

  1. Turn the ignition ON. Using the scan tool confirm the radio and (if equipped  ) the amplifier are active on the bus. If OK go to Step 2  . If not OK refer to the NO RESPONSE FROM ECU diagnosis and testing in before proceeding further with this test.
  2. Using the scan tool confirm the following:
    1. No audio related (radio, amplifier etc.) DTCs.
    2. No configuration, communication DTCs.

    If OK go to Step 3  . If not OK refer to the appropriate DTC test for repairs before proceeding further with this test.

  3. Turn the radio ON. Adjust the balance and fader controls to check the performance of each individual speaker.
    NOTE:

    Subwoofer channel will not fade forward or rearward. Use the bass control to check the subwoofer channel output.

    What is the audio condition of all  speaker locations?

    1. Audio cannot be heard in any speaker. Go to Step 16 
    2. Audio can be heard in one or more speaker. Go to Step 4 
  4. Audio configuration of the vehicle.

    Does this vehicle have an amplifier?

    1. Yes this vehicle has an amplifier Go to Step 5  .
    2. No this vehicle does not have an amplifier Go to Step 11  .
  5. (from Step 4) RADIO/AMPLIFIER CONFIGURED VEHICLE 

    Turn the radio OFF. Turn the ignition to the OFF position. Disconnect and isolate the battery negative cable. Remove the radio from the instrument panel. Disconnect the corresponding radio wiring harness connector at the amplifier. For each inoperative speaker location, check each speaker feed (+) and return (-) circuits between the radio and amplifier at the radio wire harness connector for the following:

    1. Open/High Resistance (there should be continuity / approximately 1 to 1.5 ohms)
    2. Short To Ground
    3. Short To Voltage
    4. Short To Another Circuit
    NOTE:

    In each case, there should be no open or shorts.

    If OK, go to Step 6  . If not OK, repair the open or shorted speaker feed (+) and or return (-) circuit(s) between the radio and amplifier connectors as required.

  6. Install the radio. Connect the battery negative cable. Check for battery voltage at the fused B(+) fuse for the amplifier in the Power Distribution Center (PDC). If OK, go to Step 7  . If not OK, repair the open fused B(+) circuit to the PDC fuse as required.
  7. Check for battery voltage at the fused B(+) circuit cavities of the amplifier wire harness connector. If OK, go to Step 8  . If not OK, repair the open fused B(+) circuit(s) to the amplifier fuse in the junction block as required.
  8. Turn the ignition switch to the ON position. Turn the radio ON. Check for battery voltage at the enable signal to amplifier circuit cavity of the amplifier wire harness connector. If OK, go to Step 9  . If not OK, repair the open enable signal to amplifier circuit to the radio as required.
  9. Turn the radio OFF. Turn the ignition switch to the OFF position. Disconnect and isolate the battery negative cable. For each inoperative speaker location, check each amplifier speaker feed (+) circuit and return (-) circuit of the amplifier, between the amplifier and speaker at the amplifier wire harness connectors for the following:
    1. Open/High Resistance (there should be continuity / approximately 1 to 1.5 ohms)
    2. Short To Ground
    3. Short To Voltage
    4. Short To Another Circuit
    NOTE:

    In each case, there should be no open or shorts.

    If OK, go to Step 10  . If not OK, repair the open or shorted speaker feed (+) and or return (-) circuit(s) between the amplifier and speaker connectors as required.

  10. For each inoperative speaker location, check the resistance of the speaker. The meter should read between 1 and 10 ohms (speaker resistance).

    If OK, replace the amplifier first. If the condition is still present  replace the radio.

    If not OK, replace the faulty speaker.

  11. (from Step 4) RADIO ONLY CONFIGURED VEHICLE 

    Turn the radio OFF. Turn the ignition switch to the OFF position. Disconnect and isolate the battery negative cable. For each inoperative speaker location, check each radio speaker feed (+) circuit and return (-) circuit of the radio, between the radio and speaker at the radio wire harness connectors for the following:

    1. Open/High Resistance (there should be continuity / approximately 1 to 1.5 ohms)
    2. Short To Ground
    3. Short To Voltage
    4. Short To Another Circuit
    NOTE:

    In each case, there should be no open or shorts.

    If OK, go to Step 12  . If not OK, repair the open or shorted speaker feed (+) and or return (-) circuit(s) between the radio and speaker connectors as required.

  12. Check for continuity between the ground circuit cavities of the radio wire harness connector and a good ground. There should be continuity. If OK, go to Step 13  . If not OK, repair the open ground circuit(s) to ground as required.
  13. Install the radio. Connect the battery negative cable. Check for battery voltage at the fused B(+) fuse for the radio in the Power Distribution Center (PDC). If OK, go to Step 14  . If not OK, repair the open fused B(+) circuit to the PDC fuse as required.
  14. Check for battery voltage at the fused B(+) circuit cavities of the radio wire harness connector. If OK, go to Step 15  . If not OK, repair the open fused B(+) circuit(s) to the amplifier fuse in the junction block as required.
  15. For each inoperative speaker location, check the resistance of the speaker. The meter should read between 1 and 10 ohms (speaker resistance).

    If OK, replace the faulty radio.

    If not OK, replace the faulty speaker.

  16. (from Step 3) AUDIO CANNOT BE HEARD IN ANY SPEAKER 

    Check the audio configuration of the vehicle.

    Does this vehicle have an amplifier?

    1. Yes this vehicle has an amplifier Go to Step 17  .
    2. No this vehicle does not have an amplifier Go to Step 20  .
  17. (from Step 16) RADIO/AMPLIFIER CONFIGURED VEHICLE 

    Check for battery voltage at ALL power supply fused B(+)/ignition related circuits to the amplifier. If OK, go to Step 18  . If not OK, repair the circuits for an open or high resistance as required.

  18. Check ALL ground related circuits to the amplifier. If OK, go to Step 19  . If not OK, repair the ground circuit(s) for an open or high resistance as required.
  19. Remove the radio from the instrument panel. Disconnect the corresponding radio wiring harness connector at the amplifier. For each inoperative speaker location, check each speaker feed (+) and return (-) circuits between the radio and amplifier at the radio wire harness connector for the following:
    1. Open/High Resistance (there should be continuity / approximately 1 to 1.5 ohms)
    2. Short To Ground
    3. Short To Voltage
    4. Short To Another Circuit
    NOTE:

    In each case, there should be no open or shorts.

    If OK, replace the amplifier first. If the condition is still present  replace the radio.

    If not OK, repair the open or shorted speaker feed (+) and or return (-) circuit(s) between the radio and amplifier connectors as required.

  20. (from Step 16) RADIO ONLY CONFIGURED VEHICLE 

    Check for battery voltage at ALL power supply fused B(+)/ignition related circuits to the Radio. If OK, go to Step 21  . If not OK, repair the circuits for an open or high resistance as required.

  21. Check ALL ground related circuits to the radio. If OK, go to Step 22  . If not OK, repair the ground circuit(s) for an open or high resistance as required.
  22. For each inoperative speaker location, check each speaker feed (+) and return (-) circuits between the radio and speaker at the radio wire harness connector for the following:
    1. Open/High Resistance (there should be continuity / approximately 1 to 1.5 ohms)
    2. Short To Ground
    3. Short To Voltage
    4. Short To Another Circuit
    NOTE:

    In each case, there should be no open or shorts.

    If OK, then replace the radio.

    If not OK, repair the open or shorted speaker feed (+) and or return (-) circuit(s) between the radio and speaker connectors as required.

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