B1B51 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1B51 – 1st Row Driver Seat Belt Sensor Circuit High


B1B51 Possible Symptoms


Air Bag Warning Light ON


B1B51 Possible Causes


Faulty Driver Seat Belt Buckle Switch,Driver Seat Belt Buckle Switch harness is open or shorted,Driver Seat Belt Buckle Switch circuit poor electrical connection,Faulty Occupant Restraint Controller (ORC)


B1B51 Description


When powered, the Occupant Restraint Controller (ORC) sends a test current across the Driver Seat Belt Buckle Switch circuits every 100ms to verify the integrity of the switch and wiring. The front seat belt switches cannot be adjusted or repaired and, if ineffective or damaged, the entire front seat belt buckle-half unit must be replaced. The airbag warning lamp will display in the instrument cluster for this fault. With the ignition on and the Occupant Restraint Controller (ORC) configured for a Driver Seat Belt Buckle Switch. The ORC monitors the switch input current ranges at power up and continuously every 100ms.