What it means
The restraint module monitors the deployment circuit for the third-row left seatbelt pretensioner B. It sets this code when the circuit’s measured electrical characteristics are outside the expected range.
At a glance
- Usually lights the airbag (SRS) or body-system warning light
How it works
The restraint module monitors the deployment circuit for pretensioner B at the third-row left seatbelt. A pretensioner tightens the belt in a crash; this code sets when the circuit’s electrical characteristics fall outside the expected range, potentially leaving that belt’s pretensioner unavailable.
Common causes
Most likely first.
- Open or short in pretensioner circuit
- Damaged wiring or connector
- Failed pretensioner inflator
- Fault in the restraint control module
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
How to diagnose it
- Scan the restraint module for related codes and event data to confirm the fault is assigned to the third-row left pretensioner B circuit.
- Check the third-row left belt for normal routing, visible damage, or signs of prior deployment without pulling on or probing the pretensioner wiring.
- Visually inspect accessible wiring and connectors for the third-row left pretensioner B for damage, pinching, looseness, or corrosion.
- Have the circuit checked for an open, short, or abnormal resistance using the manufacturer’s restraint-system procedure and specification; do not use an ordinary test light or ohmmeter on the inflator circuit.
- If the wiring passes, have the third-row left pretensioner B and restraint module evaluated with approved diagnostic equipment.
Common fixes
- Secure a loose connector using the manufacturer’s restraint-system procedure.
- Repair damaged wiring in the third-row left pretensioner B circuit using approved methods.
- Replace the third-row left pretensioner B if its failure is confirmed.
- Repair or replace the restraint control module if its circuit fault is confirmed.
Can I keep driving?
The third-row left seatbelt pretensioner may not tighten the belt in a crash, and other restraint functions may also be affected. Avoid carrying passengers in that seating position until the system is checked; restraint circuits require safe handling by a qualified technician.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.