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Tahoe / Yukon Service Manual

DTC B1B2F

Cellular, Entertainment, and Navigation | Diagnostic Information and Procedures | Document ID: 5536409 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC B1B2F Radio Audio/Video Communication Lost For symptom byte information, refer to Symptom Byte List. Circuit/System Description The Ethernet bus 4 is used to communicate Audio Video Bridge (AVB) data between K73 Telematic Control Module and A11  Radio. This Ethernet harness consists of a single twisted copper pair of wires (circuits 7210 & 7211) from point to point. Conditions for Running the DTC The system voltage is between 9–16 V. Conditions for Setting the DTC The K73 Telematic Control Module is unable to send audio/video data to the A11  Radio over ethernet. Action Taken When the DTC Sets No audio/video data from the K73 Telematic Control Module will be displayed. Conditions for Clearing the DTC A current DTC will clear when the diagnostic runs and passes. A history DTC will clear after 100 consecutive malfunction-free ignition cycles. Reference Information Schematic Reference Data Communication Schematics Control Module References Connector End View Reference Master Electrical Component List 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.
  2. Verify that DTC U0184, DTC U1008 or DTC U3000 is not set. ⇒ If any of the DTCs are set Refer to Diagnostic Trouble Code (DTC) List - Vehicle. ⇒ If none of the DTCs are set but B1B2F is set Attempt to reprogram the A11 Radio. 2.1. Verify that DTC B1B2F is not set. ⇒ If DTC B1B2F is set. Replace the A11 Radio. 2.2. Verify that DTC B1B2F is not set. ⇒ If DTC B1B2F is set. Replace the K73 Telematic Control Module. ⇓ If no DTCs are set
  3. A fault is currently not present and may be an intermittent condition. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification. For control module replacement, programming, and setup, refer to: Control Module References