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B1651
System
Supplemental Restraint (Airbag)
Scanner som krävs
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Occupant Classification System Not Learned

Understand B1651, common causes, and the right TOPDON scanner to diagnose it.

OCS zero-point or calibration not completed after service.

Vanliga symptom

  • Passenger airbag always off
  • Airbag light on

Typiska orsaker

  • Seat service without calibration
  • New OCS mat not programmed
  • Battery disconnect sequence skipped

Vilken scanner behöver du?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade TOPDON-scannrar

Vanliga frågor

What does B1651 mean?
B1651 indicates occupant classification system not learned. OCS zero-point or calibration not completed after service.
Can I diagnose B1651 with a basic code reader?
B1651 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for B1651?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with B1651?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.