Diagnosis And Testing - Speaker

Any diagnosis of the Audio system should begin with the use of a scan tool and the appropriate Diagnostic & Testing article . 

Refer to the appropriate wiring information.

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 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 switch to the ON position. Turn the radio receiver ON. Adjust the balance and fader controls to check the performance of each individual speaker. Note the speaker locations that are not performing correctly. Go to  2.
   NOTE:

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

2. Turn the radio receiver OFF. Turn the ignition switch to the OFF position. Disconnect and isolate the battery negative cable. Remove the radio receiver from the instrument panel. Disconnect the wire harness connector at the power amplifier. Check both the speaker feed (+) circuit and return (-) circuit cavities for the inoperative speaker location(s) at the radio receiver wire harness connectors for continuity to ground. In each case, there should be no continuity. If OK, go to  3. If not OK, repair the shorted speaker feed (+) and or return (-) circuit(s) to the speaker as required.
3. For each inoperative speaker location, check for continuity between the speaker feed (+) circuit cavities of the radio receiver wire harness connectors and the power amplifier wire harness connectors. Repeat the check for each inoperative speaker location between the speaker return (-) circuit cavities of the radio receiver wire harness connectors and the power amplifier wire harness connectors. In each case, there should be continuity. If OK, go to  4. If not OK, repair the open speaker feed (+) and or return (-) circuit(s) as required.
4. Check for continuity between the two ground circuit cavities of the power amplifier wire harness connector and a good ground. There should be continuity. If OK, go to  5. If not OK, repair the open ground circuit(s) to ground as required.
5. Install the radio receiver. Connect the battery negative cable. Check for battery voltage at the fused B(+) fuse for the power amplifier in the Power Distribution Center (PDC). If OK, go to  6. If not OK, repair the open fused B(+) circuit to the PDC fuse as required.
6. Check for battery voltage at the two fused B(+) circuit cavities of the power amplifier wire harness connector. If OK, go to  7. If not OK, repair the open fused B(+) circuit(s) to the power amplifier fuse in the junction block as required.
7. Turn the ignition switch to the ON position. Turn the radio receiver ON. Check for battery voltage at the enable signal to amplifier circuit cavity of the power amplifier wire harness connector. If OK, go to  8. If not OK, repair the open enable signal to amplifier circuit to the radio receiver as required.
8. Turn the radio receiver OFF. Turn the ignition switch to the OFF position. Disconnect and isolate the battery negative cable. For each inoperative speaker location, check both the amplified feed (+) circuit and the amplified return (-) circuit cavities of the power amplifier wire harness connectors for continuity to ground. In each case there should be no continuity. If OK, go to  9. If not OK, repair the shorted amplified feed (+) and or amplified return (-) circuit(s) to the speaker as required.
9. Disconnect the speaker wire harness connector at the inoperative speaker. Check for continuity between the amplified feed (+) circuit cavities of the speaker wire harness connector and the power amplifier wire harness connector. Repeat the check between the amplified return (-) circuit cavities of the speaker wire harness connector and the power amplifier wire harness connector. In each case there should be continuity. If OK, replace the faulty speaker. If not OK, repair the open amplified feed (+) and or amplified return (-) circuit(s) as required. If condition is still present, go to  10.
10. For each inoperative speaker location, check the resistance between the amplified feed (+) circuit and the amplified return (-) circuit cavities of the power amplifier wire harness connectors. The meter should read between 3 and 5 ohms (speaker resistance). If OK, replace the faulty power amplifier.