Radio Audio Inoperative at Rear Seat Audio (RSA) Control

Radio Audio Inoperative at Rear Seat Audio (RSA) Control

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions)provide an overview of each diagnostic category.



Circuit/System Description

The rear seat audio (RSA) feature allows rear seat passengers to listen to a different audio program than the front seat passengers. When RSA is on the rear vehicle speakers are muted, and the rear passengers can select their own audio program to listen to using the headphones.


When RSA is turned on, Serial data messaging is used to signal the RSA module to mute the rear speakers.


Each of the audio output channel circuits (+) and (-), at the radio, and at the amplifier (if equipped) have a DC bias voltage that is one half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. Low volume and talk settings will measure around 1V AC and less, where constant music may measure 3V AC and slightly higher. In an amplified audio system, these similar AC voltage measurements may be slightly higher on the output of the amplifier, and the typical AC voltage readings at the output of the radio are less than 1V AC .


Diagnostic Aids

The front tweeter speakers are connected to the same channel as the front door speakers.


Reference Information
Schematic Reference

Radio/Navigation System Schematics (Radio/Navigation System Schematics)
Connector End View Reference

Component Connector End Views (Component Connector End Views)
Description and Operation

Radio/Audio System Description and Operation (Radio/Audio System Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Programming and Relearning (Programming and Relearning)for scan tool information


Circuit/System Verification

Radio ON, Rear Seat Audio (RSA) OFF(if equipped), adjust the fade and balance controls on the radio to test all four channels individually. Each of the four channels should produce clear and even sound. If each of the four channels does not produce clear and even sound go to Speaker Malfunction (Speaker Malfunction) .


Circuit/System Testing

1. Radio ON, RSA ON,Center the balance and fade adjustment on the radio.
2. Verify that the wired headphones are plugged in and are set to the proper channel and are working properly.

• If the wired headphones are only partially functional, test another set of headphones or replace the headphones.


• If the wired headphones are only partially functional, replace the RSA module.




Repair Instructions

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

* Rear Seat Audio Control Replacement (Rear Seat Audio Control Replacement)
* Programming and Relearning (Programming and Relearning)for Amplifier and Radio replacement, setup, and programming