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 provides an overview of each diagnostic category.

### DTC Descriptors

DTC B1289 01: Video Display Brightness Control Signal Short to Battery
DTC B1289 02: Video Display Brightness Control Signal Short to Ground
DTC B1289 04: Video Display Brightness Control Signal Open

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
DVD Display B+ | 1 | 1 | 1 | --
Radio ON Signal | 1 | 1 | 1 | --
Video Display Brightness Signal | B1289 02, * | B1289 04, * | B1289 01, * | --
Video Display Mode Control | B1288 02 | B1288 04 | B1288 01 | --
Video High Signal | 2 | 2 | 1 | --
Video Low Signal | 1 | 2 | 3 | --
DVD Display Ground | -- | 1 | -- | --
1. Video Entertainment System Inoperative. 2. Backlight only -- NO image shown. 3. Serious damage to radio can occur. *. Video Brightness can not be adjusted.

### Circuit Description

The rear seat entertainment (RSE) system utilizes the vehicle radio to play DVD movies and transmit video signals to the rear digital video disc (DVD) display. When the radio is turned ON, the DVD display receives a voltage signal from the radio via the entertainment remote enable signal circuit indicating the system status. The video high and low signal circuits are used to transmit the DVD images to the rear DVD display. The video high (+) voltage will vary as the brightness and the speed of the image varies. A typical voltage reading for the video high (+) is 1 to 2.5V at the disconnected video display.

### Conditions for Running the DTC

• | Ignition ON.

• | Battery voltage must be between 9-16 volts.

### Conditions for Setting the DTC

The DTC will set when the radio detects a short to voltage, short to ground, or an open/high resistance in the video display brightness control circuit 400 ms after the radio activates the remote enable circuit.

### Action Taken When the DTC Sets

The radio sets the DTC and defaults the video display to full brightness.

### Conditions for Clearing the DTC

• | The condition responsible for setting the DTC no longer exists.

• | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

### Reference Information

#### Schematic Reference

Radio/Navigation System Schematics

#### Connector End View Reference

Entertainment/Communication 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

Scan Tool Data List

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the rear video display.
2. Ignition ON, test for 100-300 Hz at the control circuit terminal 9.

⇒ | If not within the specified range, test the control circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the radio.

3. If all circuits test normal, replace the rear video display.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Video Display Replacement

• | Control Module References for radio replacement, setup, and programming