B0079 - 06 airbag control unit fault

What does error code B0079 06 mean?

Error code B0079 06 indicates a specific hardware or connection fault in the driver-side seatbelt pretensioner circuit. The airbag control unit (SRS module) has detected a malfunction in the activation or triggering of the pretensioner, suggesting a defective component, a cable break, or an internal control unit error.

Technically speaking, the error description reads: "Driver Seatbelt Pretensioner ‘B’ Deployment Control (Subfault)." This means that the SRS module’s internal monitoring system has registered an irregularity in the pretensioner circuit, and the ignition circuit is no longer being properly controlled.

In vehicles such as the Saturn Ion 1, this error code is a clear indicator that the safety device is not functioning as intended. The system disables the affected circuit to prevent false activations, which is signaled by the illuminated airbag warning light.

How can you recognize error B0079 06?

The primary symptom is a continuously illuminated airbag or SRS warning light on the instrument panel. Error code B0079 06 cannot be permanently cleared with a diagnostic tool and reappears immediately, indicating a persistent, active hardware fault within the system that disables the pretensioner’s protective function.

The airbag warning light is the unmistakable sign of a problem in the restraint system. It does not extinguish after starting the vehicle and alerts the driver to an urgent safety issue.

Another clear indication is the persistence of the error. Even after resetting via diagnostic tools such as Hella Gutmann, Autocom, or Bosch KTS, error code B0079 06 returns almost instantly.

As a result, both the pretensioner and potentially the driver’s airbag are deactivated. In the event of a crash, this critical safety component would fail to deploy, significantly increasing the risk of injury.

What causes B0079 06?

The most common cause is a defect in the pretensioner itself, followed by wiring issues such as broken cables, corrosion at connectors, or poor contacts. Another major cause is an internal hardware failure in the airbag control unit, for example, in the circuit board or actuation relays. Stored crash data following an accident can also trigger this error.

The driver-side pretensioner often ranks first among potential culprits. Internal mechanical or electrical defects in this component prevent proper operation and are flagged as errors by the control unit.

Electrical connections are a frequent weak point. Broken cables, corroded connector pins—especially under the driver’s seat or directly on the control unit—can disrupt the current flow to the pretensioner. A faulty ground connection is another possible cause.

Occasionally, the fault lies directly within the airbag control unit. Internal components on the circuit board, such as relays or actuation circuits, may fail, blocking the correct activation of the pretensioner.

After a crash, so‑called crash data is stored in the control unit’s memory, effectively locking the system. Even if the pretensioner has been replaced, the control unit must be reset to clear the error code.

This error is often diagnosed alongside other variants like B0079, B0079 01, or B0079 02, all of which point to problems related to the pretensioner area.

In which vehicles does error B0079 06 occur?

Error code B0079 06 is specifically diagnosed in certain vehicle models, particularly North American makes from the early 2000s. The issue described here primarily affects Saturn vehicles that use a specific generation of SRS control units.

At Airbag24, repairs for error code B0079 06 are well-known and regularly performed on the following model: the Saturn Ion 1, manufactured between 2003 and 2007.

How is error B0079 06 professionally repaired?

Professional repair focuses on restoring the airbag control unit. After removal and shipment, the unit undergoes component-level analysis; defective parts such as relays or circuit board modules are replaced, and any stored crash data is erased. Following a functional test, the unit is fully operational again.

The process begins with removing the airbag control unit from the vehicle, typically located in the center tunnel or beneath the driver’s seat. A preliminary diagnosis should confirm that the fault does not stem from external wiring or the pretensioner itself.

Once sent to Airbag24, an in-depth analysis of the circuit board follows. Technicians examine the relevant circuits responsible for activating the pretensioner.

Defective electronic components are identified and replaced with new, high-quality parts. If the vehicle was involved in an accident, the crash data stored in the memory is professionally and completely erased.

Finally, each repaired control unit undergoes a comprehensive functional test on a specialized test bench. This ensures that the device communicates flawlessly once again and correctly activates all safety functions.

The refurbished control unit is returned ready for installation. We provide a 12-month warranty on the repair performed.