Airbags

B0054 — Second Row Center Seatbelt Sensor Circuit Fault

Severity: medium Safe to drive

What B0054 means

The restraint (SRS) control module continuously monitors the buckle sensor for the center rear seat belt and expects a signal within a set range. B0054 means that signal is missing, erratic or out of range, pointing to a failed sensor, an open or shorted circuit, or a poor connection. The system may then be unable to tell whether that seat's belt is fastened.

Symptoms

  • Airbag/SRS warning light on or flashing
  • Center rear belt reminder always on or never on
  • B0054 stored in the restraint module
  • Rear center belt status not detected correctly

Possible causes

  1. Faulty center rear seatbelt buckle sensor
  2. Open or shorted wiring in the sensor harness
  3. Corrosion or loose connection at the sensor connector
  4. Harness damaged by seat removal or pinched under the seat
  5. Restraint or body control module fault (rare)

How to diagnose

  1. Scan all SRS codes, record them, clear B0054 and see whether it returns
  2. Inspect the center rear buckle and its connector under the seat for moisture, corrosion or damage
  3. Check that the harness is not pinched or broken at flex points
  4. Watch the sensor status in scan tool data while buckling and unbuckling
  5. Test circuit resistance and check for shorts to ground or power using the factory wiring diagram
  6. Swap in a known good buckle sensor to confirm the fault
  7. If wiring is fine, check the SRS module and for software updates

Common fixes

  • Replace the center rear seatbelt buckle sensor
  • Repair the harness or replace the damaged connector
  • Clean the terminals and remove corrosion
  • Replace or reprogram the SRS or body control module if it is the cause

Questions and answers

Can I drive with B0054?

Yes, the car will drive normally. The restraint system for that seat may not work properly in a crash, so have it repaired soon.

Why is my airbag light on?

The SRS module detected a fault in the seatbelt sensor circuit and is warning you. The light usually stays on until the fault is fixed.

Can I fix B0054 myself?

You can visually check the connector and wiring under the seat after disconnecting the battery. Work on SRS components is best left to a qualified technician.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.