What it means
This code identifies a fault associated with the third row left seat belt sensor. The restraint control module sets it when it detects a problem with this sensor; the specific fault is identified by accompanying subfault information.
How it works
The third-row left seat-belt sensor reports that position's belt status to the restraint control module. The module monitors the sensor signal and circuit for an abnormal condition; the accompanying subfault information gives the specific fault type.
Common causes
Most likely first.
- Damaged seat belt sensor wiring or connector
- Faulty seat belt sensor
- Seat belt buckle or latch fault
- Restraint control module fault
Symptoms
- Airbag warning light on
- Seat belt warning may stay on
- Seat belt status may be misreported
How to diagnose it
- Retrieve the B0056 subfault and freeze-frame data with a scan tool capable of reading the restraint control module.
- Check that the third-row left belt and buckle are accessible, undamaged, and latch and release normally.
- Inspect the left third-row buckle connector and wiring for loose connections, corrosion, chafing, or damage where the seat folds or moves.
- Monitor third-row left belt-status data while operating the buckle and check that the reported status follows the belt.
- Test the sensor and circuit using the manufacturer's diagnostic procedure before suspecting the restraint control module.
Common fixes
- Reconnect or repair damaged wiring at the third-row left buckle.
- Repair corroded or damaged connector terminals.
- Replace the faulty third-row left sensor or buckle assembly as specified for the vehicle.
- Repair or replace the restraint control module only after verifying its connections and the sensor circuit.
Can I keep driving?
The vehicle may be driveable, but it may not correctly recognize the third-row left belt and the restraint system may not be ready to operate as designed. Ensure the belt latches securely and have the fault diagnosed promptly.
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.