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 B0996 00: Vehicle Identification Number Mismatch
DTC B1016 47: Vehicle Identification Number Not Programmed
DTC B1271 00: Theft Locked

### Circuit Description

This DTC is generated by the module when the Theft Lock is activated. This occurs when the VIN is received over serial data and the VIN as stored in the module memory do not match. This also occurs when no VIN is received over the serial circuit. The only circuit required is the serial data communication line.

### Conditions for Running the DTC

This DTC test runs when the radio changes from OFF to ON.

### Conditions for Setting the DTC

This DTC is generated by the module when the VIN as received via serial data and the VIN as stored in the module memory do not match. This also occurs if no VIN is received via serial data.

### Action Taken When the DTC Sets

The radio does not function. The radio display will indicate that Theftlock is active.

### Conditions for Clearing the DTC

Re-calibration with the correct calibrations for the vehicle and cycling the radio to OFF then to ON will clear the DTC if there is no damage to the radio.

### Diagnostic Aids

This DTC may be an indication that an incorrect radio is installed in the vehicle, or that the radio 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 DTC B0996, B1016, or B1271 is not set.

⇒ | If any DTCs are set, program the radio. If the DTC resets, replace the radio.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio replacement, setup, and programming