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 Descriptor

DTC B0998: Screen 1 EEPROM Failure
DTC B0999: Screen 2 EEPROM Failure

### Circuit/System Description

The EEPROM (Electrically Erasable Programmable Read Only Memory) is part of the printed circuit board housed within the DVD screen. It stores variables required for the operation of the rear seat entertainment system.

### Conditions for Running DTC

The DVD screen runs the program to detect an internal fault or compatibility concern when power up is commanded. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.

### Conditions for Setting the DTC

DTCs B0998 and B0999 will set if the EEPROM checksum is incorrect. The testing of the EEPROM checksum occurs every time the ignition is turned on. The DTC is reset when the EEPROM checksum is tested as being correct. The DTC is logged as a History DTC.

DTC B0999 is only applicable to level 5 vehicles with DVD screens mounted within the rear seats and applies to the second of the two screens.

### Action Taken When DTC Sets

The system will set the DTC and disable itself.

### Conditions for Clearing the DTC

• | The condition for setting the DTC is no longer present.

• | The history DTC will clear after 50 fault-free ignition cycles.

### Reference Information

#### 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

• | 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 Testing

1. Verify that DTC B0998 or B0999 is not set.

⇒ | If either DTC B0998 or B0999 is set to current, replace the appropriate DVD screen.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Video Display Replacement