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 B3031 00: Security System Controller In Learn Mode

### Circuit/System Description

When learning a coded key, the body control module (BCM) is placed in learn mode. DTC B3031 will set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the coded key is learned, learn mode will be exited and the DTC cleared. If the BCM does not exit learn mode, B3031 will remain current and indicate a fault. The instrument cluster security indicator will turn ON and the driver information center will display a message.

### Conditions for Running the DTC

The immobilizer system is the learn coded keys state.

### Conditions for Setting the DTC

DTC B3031 will set any time the BCM enters the learn coded keys state.

### Action Taken When the DTC Sets

The security indicator will illuminate. The driver information center will display a message.

### Conditions for Clearing the DTC

• | A current DTC B3031 will be cleared upon the successful exit of learn mode.

• | A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.

### Reference Information

#### Schematic Reference

Immobilizer Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Immobilizer 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 B3055 is not set as current.

⇒ | If DTC B3055 is set as current, refer to DTC B3055.

2. Verify the scan tool body control module Total Keys Learned parameter displays a learned key.

⇒ | If not the specified value, perform the Vehicle Key Relearn procedure. Refer to Replacing Keys.

3. Perform the Vehicle Key Relearn procedure. Refer to Replacing Keys. The Body Control Module should exit the learn coded key state and DTC B3031 should clear.

⇒ | If the Body Control Modules does not exit the learn coded key state after the programming attempt, replace the K9 Body Control Module (BCM).

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup and programming