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 B0997 3A: Auxiliary Electronic Control Unit (ECU) 2 Performance Incorrect Component
DTC B0997 33: Auxiliary Electronic Control Unit (ECU) 2 Performance Special Memory Failure
DTC B0997 36: Auxiliary Electronic Control Unit (ECU) 2 Performance, EEPROM Failure
DTC B0997 42: Auxiliary Electronic Control Unit (ECU) 2 Performance Calibration Data Set Not Programmed
DTC B0997 45: Auxiliary Electronic Control Unit (ECU) 2 Performance Variant Not Programmed

### Circuit/System Description

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

### Conditions for Running DTC

The driver information display runs the program to detect an internal fault or compatibility concern when the radio changes from OFF to ON.

### Conditions for Setting the DTC

• | The driver information display internal EEPROM has failed or is corrupt.

• | An incompatible driver information display is installed to the infotainment unit.

• | The driver information display that is installed is compatible but different from the current learned type.

### Action Taken When DTC Sets

The system will set the DTC and not function.

### Conditions for Clearing the DTC

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

• | The DTC can be cleared using a scan tool.

### Diagnostic Aids

This DTC may be an indication that an driver information display is installed in the vehicle, or that the facia was replaced without reprogramming with the new information.

### 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 Verification

1. Verify that DTC B0997 is not set.

⇒ | If the DTC is set, reprogram the radio. If the DTC resets, replace the driver information display.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for driver information display replacement, and for radio setup, and programming