Reduced Volume - One or More Speakers

Reduced Volume - One or More Speakers

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

Without Amplifier
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. Connect a DMM between the suspect low level audio signal circuits.
3. Turn ON the radio and use the CD Diagnostic kit or tune the radio to a channel with no reception (static). Record the AC voltage of the suspect speaker channel and compare and verify the AC voltage output of the suspect low level audio signal is the same as the opposite low level channel.

• If the suspect speaker channel low level audio signal AC voltage is lower than other channels, replace the radio.

• If the recorded AC voltage is the same level as other speaker low level audio signal AC outputs, replace the suspect speaker.

With Amplifier
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. Disconnect the harness connector containing the low level audio circuits at the amplifier. Connect a DMM between the suspect low level audio signal circuits. Turn ON the radio and record the AC voltage of the suspect speaker channel. Compare and verify the AC voltage output of the suspect low level audio signal is the same as opposite low level channel.

• If the suspect speaker channel low level audio signal AC voltage is lower than other channels, replace the radio.

3. Reconnect the harness connector containing the low level audio circuits and disconnect the harness connector at the individual speakers. Connect a DMM between the suspect speaker signal circuits. With Turn ON the radio and record the AC voltage of the suspect speaker channel. Compare and verify the AC voltage output of the suspect speaker signal is similar to other speakers.

• If the suspect channel speaker signal AC voltage is lower than other channels, replace the amplifier.

• If the recorded AC voltage is the same level as other speaker signal AC outputs, replace the suspect speaker.

Repair Instructions

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

* Speaker Replacement Reference