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 B3926: Screen 1 Theft Locked
DTC B3927: Screen 2 Theft Locked

### Circuit/System Description

The DVD screen and rear seat entertainment interface module communicate with each other to verify that a security code relayed between the two components is valid. The DTC will pass when the both components acknowledge a matching code.

### Conditions for Setting the DTC

• | The RSE system transitions from OFF to ON. This may be in response to the RSE system power switch or an ignition key cycle.

• | This DTCs will set when there is a security code mismatch.

• | Battery voltage must be between 9-16 volts.

### Action Taken When the DTC Sets

The system will enter the Theft Detected Mode.

### 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.

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

### Reference Information

#### Schematic Reference

Video System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Video Entertainment 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 B3926 or B3927 is set to current.

⇒ | If DTC B3926 or B3927 is set to current and "Security Error" is displayed on the screen attempt DVD screen to rear seat entertainment interface module auto-learn procedure.

2. RSE system OFF, ignition OFF, wait for 30 seconds.
3. Ignition ON, RSE system ON, select the DVD function for the system, verify that DVD screen functions correctly.

⇒ | If the RSE system fails to function correctly, replace the appropriate DVD screen.

### Repair Instructions

Perform the Diagnostic Repair Verification.

Video Display Replacement