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Tahoe / Yukon Service Manual

DTC B19C2 or B19C3

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 B19C2 Left Front Seat Heating Switch DTC B19C3 Right Front Seat Heating Switch Symptom Byte Information: Symptom Byte List Circuit/System Description An internal fault is detected inside the switch. No external circuits are involved. Conditions for Running the DTC Vehicle ON. Conditions for Setting the DTC The control module detects an internal switch fault. Action Taken When the DTC Sets The front seat heater control module will disable all heated seat functions. Conditions for Clearing the DTC The DTC clears when the diagnostic runs and passes. The history DTC will clear after 40 consecutive fault-free Vehicle ON/OFF cycles have occurred. Reference Information Schematic Reference Heated/Cooled Seat Schematics Connector End View Reference Master Electrical Component List Description and Operation Heated/Vented Seat 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. Vehicle ON.
  2. Verify DTCs B19C2 or B19C3 are not set. ⇒ If a DTC is set Replace the A26 Heater and Air Conditioning User Interface Control - Front. ⇓ If no DTCs are set
  3. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair.