When the radio is ON, the radio supplies battery voltage on the rear seat audio (RSA) enable circuit and 10 volts on the remote interface reference circuit to the RSA controller. Enabling the RSA controller connects the 10-volt reference and the remote radio control signal circuits internally. This forms a voltage divider with a resistive network within the RSA controller. The voltage signal resulting from this combination is sent to the radio on the remote radio control signal circuit. The radio interprets the voltage signal as an analog input. When the radio receives the voltage input signal, indicating the POWER (PWR) button was pressed on the RSA controller, the rear speakers will be muted. This allows the user to listen to the audio through the headphones.

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Radio/Audio System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Radio ON, verify clear audio is heard from each audio speaker with the RSA system OFF.

1. Ignition OFF, disconnect the harness connector at the rear seat audio (RSA) controller.
2. Ignition OFF, test for less than 5 Ω between the ground circuit terminal B6 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, radio ON, test for 9.8-10.2 V between the voltage reference circuit terminal A8 and ground.

⇒	If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

⇒	If greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the radio.

4. Ignition ON, radio ON, test for B+ between the audio enable signal circuit terminal B5 and ground.

⇒	If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

5. Ignition OFF, connect the harness connector at the RSA controller.
6. Disconnect the X1 and X2 harness connector at the radio.
7. Ignition OFF, test for infinite resistance between the radio control circuit terminal 13 X2 and ground.

⇒	If less then the specified range, test the radio control circuit for a short to ground. If the circuit tests normal, replace the RSA controller.

8. If all circuits test normal, replace the rear seat audio controller.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.