What Is Fault Code B0073?
Fault code B0073, applicable to all vehicle manufacturers, means “Second Row Left Seatbelt Pretensioner Deployment Control (Subfault).”
Background: The seatbelt pretensioner’s function is to tighten the seatbelt at the moment of a collision.
Symptoms of Fault Code B0073
- The SRS/airbag warning light on the dashboard is illuminated.
- The airbag system may be deactivated.
- Errors may also appear when diagnosing other safety components.
Main Causes of Fault Code B0073
- Open circuit or short circuit in the seatbelt pretensioner wiring.
- Damage or corrosion in the pretensioner connector.
- Faulty seatbelt pretensioner itself.
- Malfunction of the airbag control module (SRS module).
How to Diagnose Fault Code B0073?
- Connect an OBD-II scanner and read the fault code.
- Inspect the wiring and connectors of the second-row left seatbelt pretensioner.
- Use a multimeter to measure the resistance of the pretensioner.
- Diagnose the SRS control module.
- Clear the fault code and check if it reappears.
Possible Causes and Diagnostic Methods
Possible Cause | How to Check? |
|---|---|
Open or short circuit | Check wiring integrity and for short circuits |
Damaged or corroded connector | Inspect connector for damage and corrosion |
Faulty seatbelt pretensioner | Measure pretensioner resistance with a multimeter |
Faulty SRS control module | Diagnose the module using an OBD-II scanner |
Tools Required: OBD2 scanner, multimeter, electrician’s tool kit, contact cleaner
How to Resolve Fault Code B0073? (Solution to the Problem)
Simple Fixes
- Clean the connectors and contacts of the seatbelt pretensioner.
- Check and replace fuses related to the SRS system if necessary.
- Clear the fault code with an OBD-II scanner to see if it reappears.
In-Depth Diagnostic and Repair Solutions
- Replace damaged wiring or connectors.
- Replace the faulty seatbelt pretensioner.
- If necessary, diagnose and replace the SRS control module.
Troubleshooting by Symptoms
Symptom | Possible Solution |
|---|---|
SRS warning light is on | Diagnose the system and eliminate the cause |
Fault B0073 does not disappear after reset | Check and replace defective components |
Damaged wiring or connectors | Replace the damaged components |
Fault Code B0073 in Common Vehicles
- B0073 in Chevrolet: In Chevrolet models, this fault may be caused by a failure in the second-row left seatbelt pretensioner or its wiring.
- B0073 in Ford: In Ford vehicles, code B0073 may indicate an issue with the second-row left seatbelt pretensioner, often related to an open circuit or damaged connector.
- B0073 in Nissan: In Nissan models, fault B0073 may be caused by a malfunction in the second-row left seatbelt pretensioner or its control circuit.
- B0073 in Toyota: In Toyota vehicles, code B0073 may be related to a problem in the second-row left seatbelt pretensioner control system, including an open circuit or pretensioner failure.
- B0073 in Honda: In Honda cars, fault B0073 may indicate a failure in the second-row left seatbelt pretensioner or its circuit.
B0073 FAQ
What should I do when encountering fault code B0073?
Fault code B0073 indicates a problem with the second-row left seatbelt pretensioner control. The system must be diagnosed by checking the wiring, connectors, pretensioner itself, and the SRS control module.Is it possible to drive with fault B0073?
It is not recommended, as this fault may affect the passive safety system and could lead to seatbelt failure in an emergency.What happens if fault code B0073 is not resolved?
The safety system may not function properly in an accident, particularly for the second-row left passenger. This increases the risk of injury.Can I reset fault B0073 myself?
Yes, the fault code can be cleared with an OBD-II scanner, but if the issue persists, the fault will reappear.Does fault B0073 require replacing the seatbelt pretensioner?
If diagnostics confirm a defect, replacement is necessary. This is a critical component of the safety system.
Related OBD2 Fault Codes
- B0072 – Passenger Seatbelt Pretensioner Control (Subfault)
- B0074 – Second Row Center Seatbelt Pretensioner Control (Fault)
- B0075 – Second Row Right Seatbelt Pretensioner Control (Subfault)
Important! Ignoring fault B0073 may cause the safety system to fail during an accident. Always disconnect the battery and wait at least 10 minutes before working on the SRS system to avoid accidental airbag deployment.