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 (One or More Speakers Inoperative)

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 C2 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.

Important: If the vehicle is not equipped with an amplifier skip step 3 and 4.

3. Disconnect the harness connector at the amplifier that contains the suspect inoperative speaker inputs. 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. 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 12V.

• If the suspect speaker low level audio signal AC voltage is 0V AC or 12V 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.

4. Reconnect the amplifier harness connector.
5. Disconnect the harness connector of the suspect speaker. Connect a DMM to between the suspect speaker signal circuits at the speaker harness connector. With the scan tool, perform the amplifier tone test on the suspect speaker channel and record the AC and DC voltage. Verify there is an AC voltage and not DC 12V.

• If the suspect channel speaker signal AC voltage is 0V AC or 12V 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 equipped. Replace the radio if not equipped with an amplifier.

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

Circuit/System Testing (All Speakers Inoperative)

1. Ignition OFF, Disconnect the C1 amplifier harness connector.
2. Connect a test lamp between the B+ circuit terminal 4 and ground. Verify the test lamp illuminates.

• If the test lamp does not illuminate, repair open/high resistance.

3. Connect a test lamp between the ground circuit terminal 8 and B+. Verify the test lamp illuminates.

• If the test lamp does not illuminate, repair short to voltage or open/high resistance.

4. Disconnect the C3 amplifier harness connector.
5. Ignition ON, test for greater than 9 volts on the remote enable circuit terminal 8.

• If less than specified value repair open/high resistance or replace the radio.

• If all circuits test normal replace the amplifier.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Refer to Programming and Relearning for radio, amplifier, and DDR programming and setup
* Speaker Replacement Reference Verification Tests