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Tahoe / Yukon Service Manual

DTC B1970

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 B1970 Front Seat Adjuster Switch - Passenger 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 Ignition ON. Power seat, lumbar, or bolster switch must be activated. Conditions for Setting the DTC The control module detects an internal switch fault. Action Taken When the DTC Sets The seat adjuster memory module may disable power seat, lumbar, and bolster functions. Conditions for Clearing the DTC The DTC clears when the diagnostics runs and passes. The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred. Reference Information Schematic Reference Passenger Seat Schematics Connector End View Reference Master Electrical Component List Description and Operation Power Seats 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.
  2. Operate all power seat, lumbar, and bolster functions.
  3. Verify DTC B1970 is not set. ⇒ If the DTC is set Replace the S64P Front Seat Adjuster Switch - Passenger. ⇓ If the DTC is not set
  4. A fault is currently not present and may be an intermittent condition. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair.