What does fault code B0079 mean?
Fault code B0079, applicable to all vehicle manufacturers, means “Driver Seatbelt Pretensioner B Deployment Control (Subfault)“.
Background Knowledge: The seatbelt pretensioner’s role is to tighten the seatbelt instantly at the moment of a collision.
Symptoms of Fault Code B0079
- The airbag (SRS) warning light on the dashboard is steadily illuminated.
- In some models, it may be accompanied by a beeping sound.
- The fault often occurs after an accident or poor-quality interior repairs.
- The driver’s seatbelt pretensioner system fails to operate upon impact.
- A car code scanner displays code B0079.
Main Causes of Fault Code B0079
- Damaged wiring harness to the pretensioner.
- Oxidized or loose connector contacts.
- Malfunction of the seatbelt pretensioner “B” itself.
- Improper seat installation after removal.
- SRS control module failure or damage.
How to Diagnose Fault Code B0079?
- Read the fault code with an OBD2 scanner.
- Check the safety connector under the driver’s seat.
- Visually inspect the wiring and connections for integrity.
- Measure the resistance of the seatbelt pretensioner circuit (allowable values depend on the car model).
- Replace the defective component if necessary and reset the fault code.
Possible Causes and Diagnostic Methods
Possible Cause | How to Check? |
|---|---|
Wiring Issue | Check the harness for damage. |
Loose Connector | Check connections and resecure them. |
Pretensioner Defect | Check the component’s resistance. |
Error in SRS Module | Read codes with an OBD2 scanner. |
Tools Needed: OBD2 diagnostic tool, multimeter, insulating tape, screwdrivers/wrenches for seat work.
How to Resolve Fault Code B0079? (Solutions)
Simple Fixes
- Check and reconnect connectors.
- Clean dirt and oxides from contact points.
- Reset the fault code via a scanner after addressing the cause.
In-Depth Diagnosis and Repair
- Replace the damaged pretensioner.
- Repair or replace the wiring.
- SRS control unit check and replacement.
- Calibration of the safety system after repair.
Repair Based on Symptoms
Symptom | Possible Solution |
|---|---|
Airbag Light On | Check and clean connectors. |
Error Persists After Reset | Check the SRS module. |
Pretensioner Not Activated | Replace the component. |
Fault Code B0079 in Common Vehicles
- B0079 in Chevrolet: Often occurs after seat replacement or interior cleaning. Requires checking connectors under the seat.
- B0079 in Opel: Related to load distribution between two pretensioners—”A” and “B”. Possible issues with floor connectors.
- B0079 in Toyota: The system can be very sensitive to minor wiring damage. Requires accurate checking with a multimeter.
- B0079 in Honda: The fault is often caused by damaged connections or water corrosion after an accident.
- B0079 in Ford: The error often appears as abnormal seat installation with different types of seatbelts.
- B0079 in Buick, Cadillac, GMC, Hummer, Pontiac, Saturn: Related to the “Driver Seat Position Sensor Circuit”.
B0079 FAQ
What should I do if I encounter fault code B0079?
Fault B0079 indicates a problem with the driver’s seatbelt pretensioner “B”. The malfunction can be caused by damaged wiring, connectors, or the component itself. Detailed diagnosis is required if the code appears.Is it safe to drive with fault code B0079?
Not recommended. This fault is related to the safety system. In an accident, the airbag or pretensioner may not deploy correctly.Can I fix fault B0079 myself?
Possibly, yes. If the issue is with the wiring harness, it can be cleaned and reconnected. However, if the pretensioner or SRS module is defective, professional repair is needed.What is the cost to diagnose the B0079 code?
Diagnosing the B0079 code typically requires 1.0 hour of labor. Rates vary by location, vehicle, and repair shop. Many shops charge between 150 per hour; dealerships and metropolitan areas may be higher, while independent shops may be lower.
Related OBD2 Fault Codes
- B0019 – Driver Airbag – Stage 2 (Fault)
- B0028 – Passenger Airbag – Stage 1 (Fault)
- B0080 – Passenger Seatbelt Pretensioner “B” – Deployment Control (Fault)
Important! If this fault is present, part of the SRS system may be disabled. In an accident, the airbag or pretensioner may not deploy correctly. Never attempt to repair SRS system components without disconnecting the battery first. This could cause unintended airbag deployment and serious injury. It is best to leave pretensioner and airbag work to professionals.