For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provide an overview of each diagnostic category.

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Infrared Module Supply Voltage | 1 | 1 | -- | --
Infrared Module Ground | -- | 1 | -- | --
Left DVD Audio Signal (+) | 2 | 2 | 2 | --
Right DVD Audio Signal (+) | 3 | 3 | 3 | --
DVD Audio Common Signal (-) | 4 | 4 | 4 | --
Left Infrared Audio Signal (+) | 5 | 5 | 5 | --
Right Infrared Audio Signal (+) | 6 | 6 | 6 | --
Infrared Audio Low Reference (+) | 7 | 7 | 7 | --
1. Infra Red Module Inoperative -- headphones inoperative. 2. No or distorted left audio when listening to DVD. 3. No or distorted right audio when listening to DVD. 4. No or distorted audio on both channels when listening to DVD. 5. No or distorted left audio when listening to rear seat audio.

6. No or distorted right audio when listening to rear seat audio.

7. No or distorted audio on both channels when listening to rear seat audio.

### Circuit Description

The rear seat entertainment (RSE) system consists of two, 2-channel wireless headphones that are dedicated to the system. Channel 1 is dedicated to the video screen, while 2 is dedicated to rear seat audio (RSA) selections. The infrared module receives voltage from the rear audio/HVAC module when the RSA in ON. For DVD audio playback, the infrared module recieves audio inputs directly from the radio. For all other audio sources, the radio audio signals are sent to the rear audio/HVAC modul,whichthen provides those audio inputs to the infrared module to be broadcast to the headphones.

### Reference Information

#### Schematic Reference

Video System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Video Entertainment System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Important: 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.

1. Turn ON the wireless headphones. Verify the power indicator lamp on the wireless headphone illuminates.

⇒ | If the power indicator lamp does not illuminate, test or replace the wireless headphone batteries. If the batteries are OK replace the appropriate wireless headphone.

2. Radio ON, RSA ON, and DVD playing, verify audio is heard through all of the wireless headphones.

⇒ | If all of the headphones are inoperative, or the sound is distorted, refer to Circuit/System Testing.

⇒ | If only one of the headphones is not producing sound, or the sound is distorted, replace the appropriate wireless headphone.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the infrared transmitter.
2. Ignition OFF, test for less than 5 Ω between the ground circuit terminal 12 and ground.

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

3. Ignition ON, RSA ON, test for B+ between the control circuit terminal 4 and ground.

⇒ | If less than the specified value, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear audio/HVAC module.

4. Ignition ON, DVD playing, test for AC voltage between the signal circuit terminals listed below and ground.

• | Left DVD audio signal (+) - terminal 1

• | DVD audio common (-) - terminal 2

• | Right DVD audio signal (+) - terminal 3

⇒ | If AC voltage is not present, test the signal circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the radio.

5. Ignition ON, RSA ON, test for AC voltage between the signal circuit terminals listed below and ground.

• | Left infrared audio signal (+) - terminal 9

• | Infra red audio low reference (-) - terminal 10

• | Right infrared audio signal (+) - terminal 11

⇒ | If AC voltage is not present, test the signal circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the rear audio/HVAC module.

6. If all circuits test normal, test or replace the infrared transmitter.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Audio System Transceiver Module Replacement

• | Control Module References for Rear Audio/HVAC module replacement, setup, and programming