What it means
This code identifies a fault associated with the second row left seat belt pretensioner deployment control. The restraint control module sets it when it detects a problem in that deployment control; the exact fault is specified by accompanying subfault information.
How it works
The second-row left seat-belt pretensioner tightens that seating position's belt during a qualifying crash. The restraint control module monitors its deployment-control circuit, and B0073 flags a fault associated with the circuit; the accompanying subfault information identifies the detected condition.
Common causes
Most likely first.
- Pretensioner wiring or connector fault
- Open or shorted deployment circuit
- Faulty second row left pretensioner
- Restraint control module fault
Symptoms
- Airbag warning light on
- Second row left pretensioner may not activate in a crash
How to diagnose it
- Read the restraint module's subfault details and freeze-frame data to identify the condition reported for the second-row left pretensioner circuit.
- Inspect the second-row left belt and retractor for damage, obstruction, or abnormal operation.
- Trace the accessible harness to the second-row left pretensioner and check for loose or corroded connectors, damaged pins, and chafing, especially near seat movement points.
- Test the deployment circuit for an open or short using the manufacturer's restraint-system procedure and specification.
- If the wiring passes, assess the second-row left pretensioner and then the restraint control module as directed by the manufacturer's diagnostic procedure.
Common fixes
- Repair or reconnect damaged second-row left pretensioner wiring or connector using the approved procedure.
- Repair a confirmed open or short in that deployment circuit.
- Replace the second-row left pretensioner if testing confirms it is faulty.
- Repair or replace the restraint control module only after verifying the circuit and pretensioner.
Can I keep driving?
The vehicle may be driveable, but the second-row left pretensioner may not tighten its belt in a crash. Do not rely on that seating position until the fault is diagnosed and repaired.
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.