For 1990-2009 cars

### Circuit Description

When the ignition is switched On, the antenna that is integrated in the theft deterrent module (immobilizer) is energized. The transponder key contains a security code (transponder code) that is transmitted via the antenna to the theft deterrent module. The theft deterrent module compares the received code with the stored transponder code.

### Conditions for Setting the DTC

The security code is not programmed in the theft deterrent module.

### Action Taken When the DTC Sets

• | The theft deterrent module stores a DTC 13 in memory.

• | The engine may not start.

### Conditions for Clearing the DTC

• | The conditions for the fault are no longer present.

• | A history DTC will clear after 20 consecutive ignition cycles if the condition for the fault is no longer present.

• | Use a scan tool in order to clear this DTC.

### Diagnostic Aids

Refer to Programming Replacement Keys, Ign Cyl, or ECM for the security code programming procedure.