: After repairs, the battery is reconnected and the ignition turned to ON. Technicians wait at least 60 seconds before clearing the stored codes and checking to ensure DTC B0131 is no longer output. Conclusion
: Turn the ignition to the LOCK position and disconnect the negative battery terminal, waiting at least 90 seconds to allow the SRS system to discharge.
A B0131 code is more than just a light on the dashboard; it indicates that a primary safety feature—the seat belt pretensioner—may not function during an accident. Because this involves the vehicle's explosive squibs and airbag sensors, diagnostics and repairs are usually performed by qualified technicians using official documentation like the Scion Repair Manual to ensure the system is restored to its factory-safe state. DTC B0131/64 Open in P/T Squib RH Circuit
: Using a multimeter, technicians measure the resistance of the squib. If the resistance is out of the specified range, the pretensioner likely needs replacement.
The is a critical safety component consisting of the airbag sensor assembly and the right-hand seat belt pretensioner. Its primary function is to tighten the seat belt instantly when specific collision conditions are met to keep the passenger securely in place. Technical Circuit Description
: Check the connectors and wiring between the airbag sensor and the seat belt pretensioner for physical damage or corrosion.
Understanding DTC B0131: The Front Pretensioner Squib Circuit
