B1B12 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1B12 – Driver Knee Bolster Squib Circuit Open
B1B12 Possible Symptoms
Air Bag Warning Light ON
B1B12 Possible Causes
Faulty Driver Knee Bolster Squib,Driver Knee Bolster Squib harness is open or shorted,Driver Knee Bolster Squib circuit poor electrical connection,Faulty Driver Knee Bolster 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 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 Adaptor provides a test point as well as a method for opening the shorting bar connections within the harness connector. The ORC Module 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.