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Tahoe / Yukon Service Manual

DTC B1A37

Secondary and Configurable Customer Controls | Diagnostic Information and Procedures | Document ID: 5539822 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 Descriptors DTC B1A37 Steering Wheel Controls Switch For symptom byte information, refer to Symptom Byte List. Circuit/System Description The S70R Steering Wheel Controls Switch – Right is a series of switches that control various radio and OnStar functions. Conditions for Running the DTC Ignition ON Conditions for Setting the DTC An internal failure has occurred in the S70R Steering Wheel Controls Switch - Right. Action Taken When the DTC Sets The S70R Steering Wheel Controls Switch – Right control functions will no longer operate. Conditions for Clearing the DTC The condition for setting the DTC is no longer present. Reference Information Schematic Reference Steering Wheel Secondary/Configurable Control Schematics Connector End View Reference Master Electrical Component List Description and Operation Drive Mode 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 no DTCs are set, except DTC B1A37. ⇒ If any other DTC is set, except DTC B1A37 Refer to Diagnostic Trouble Code (DTC) List - Vehicle. ⇓ If only DTC B1A37 is set
  2. Replace the S70R Steering Wheel Controls Switch – Right.
  3. Verify DTC B1A37 does not set when operating the vehicle within the conditions for running the DTC. ⇒ If the DTC sets Replace the P16 Instrument Cluster. ⇓ If the DTC does not set
  4. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for control module replacement, programming, and setup.