B1B21 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1B21 – Right Side Curtain Squib 1 Circuit High
B1B21 Possible Symptoms
Air Bag Warning Light ON
B1B21 Possible Causes
Faulty Right Side Curtain Squib 1,Right Side Curtain Squib 1 harness is open or shorted,Right Side Curtain Squib 1 circuit poor electrical connection,Faulty Right Side Curtain Airbag,Faulty Occupant Restraint Controller (ORC)
When powered, the Occupant Restraint Controller (ORC) sends a test current to the squibs to verify the integrity of the squib and the wiring. These circuits are maintained in a floating configuration at the module, (connected to neither power nor ground), as protection against inadvertent deployment. The use of the Supplemental Restraint System (SRS) Load Tool Adapter provides a test point, as well as a method for opening the shorting bar connections within the harness connector. The ORC sends out a 40 mA diagnostic current on each squib voltage supply circuit at power up and every 500 ms thereafter while the ignition is on.