Speakers Inoperative - One or More

Speakers Inoperative - One or More

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Testing

1. Center the balance and fade adjustment on the radio.

• If adjustment of the fade and balance eliminates the concern, review the operation of the radio with the customer.

2. Listen to the audio using a normal radio frequency and then a digital radio frequency, listen for any inoperative speakers. If speakers only become inoperative when using the digital radio, disconnect J2 harness connector from the radio. Verify there is AC voltage present on the suspect audio signal channel.

• If AC voltage is not present test for an open, short to ground or short to power on the suspect remote radio audio signal circuit between the radio and the digital radio receiver (DRR). If all circuits test normal, replace the DRR.

• If AC voltage is present, replace the radio.

3. Disconnect the harness connector at the amplifier that contains the suspect inoperative speaker inputs (J3 or J4).

• If the suspect speaker inputs are contained in the same harness as the amplifier power and ground It will be required to re-connect the power and ground by using a jumper harness.

4. Connect a DMM between the suspect low level audio signal circuits. With the scan tool, perform the radio tone test on the suspect speaker and verify there is an AC voltage and not DC 12 V.
5. Listen to the audio using a normal radio frequency, verify the suspect speaker low level audio signal voltage is not 0 V AC or 12 V DC.

• If voltage is 0 V AC or 12 V DC test or repair open, short to ground or short to power on the suspect speaker channel low level audio signal circuits. If a open, short to ground or a short to power can not be found, replace the radio.

6. Reconnect the amplifier harness connector.
7. Disconnect the harness connector of the suspect speaker. Connect a DMM to between the suspect speaker signal circuits at the speaker harness connector. Listen to the audio using a normal radio frequency. Verify there is an AC voltage and not DC 12 V.

• If the suspect channel speaker signal AC voltage is 0 AC or 12 V DC, test or repair open, short to ground or short to power on the suspect speaker channel signal circuits. If a open, short to ground or a short to power can not be found, replace the amplifier.

• If the suspect speaker channel signal circuits test normal, Replace the suspect speaker.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Control Module References for radio, amplifier, and DDR programming and setup
* Speaker Replacement Reference