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Tahoe / Yukon Service Manual

DTC B1B19

Cellular, Entertainment, and Navigation | Diagnostic Information and Procedures | Document ID: 5210938 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 B1B19 00 Theft Protection Active Circuit/System Description When the Control Module is initially installed in the vehicle, the Control Module receives VIN information via serial data. The Control Module stores a portion of the VIN and compares this sequence to the VIN information received each time the Control Module powers on. The VIN in the Control Module is a single one-time learn. The Control Module theft deterrent system is intended to disable or limit Control Module functionality if incorrect vehicle information is received by the Control Module. The Control Module disables functionality if the VIN information received by the Control Module does not match the VIN information that has been learned by the Control Module. This DTC is generated by the module when the Theft Protection is activated. Conditions for Running the DTC This DTC test runs when the radio changes from OFF to ON. Conditions for Setting the DTC The Control Module has learned a correct VIN sequence and the VIN information received via serial data does NOT match the learned VIN sequence. Action Taken When the DTC Sets The Control Module may be disabled or have limited functionality. The display will indicate that theft protection is active. Conditions for Clearing the DTC The Control Module receives the correct VIN information via serial data. Diagnostic Aids A possible cause of incorrect VIN info could be the Control Module was originally installed in another vehicle. Reference Information Schematic Reference Radio/Navigation System Schematics Connector End View Reference Master Electrical Component List for 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. Ignition On/Vehicle in Service Mode. Control Module ON.
  2. Verify DTC B1B19 is not set in Control Module. ⇒ If DTC B1B19 is set in Control Module Replace the Control Module. ⇓ If DTC B1B19 is not set in Control Module
  3. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for Control Module replacement, programming, and setup