Airbag control unit with part number A2079010100

What is the function of the airbag control unit A2079010100?

The airbag control unit with part number A2079010100 is the central control module for the entire occupant protection system in the Mercedes-Benz E-Class Cabriolet, model series A207 (2010–2017). It processes data from crash sensors and is responsible for precisely deploying airbags and seatbelt pretensioners in the event of a collision.

As the “brain” of the Supplemental Restraint System (SRS), this module continuously monitors all connected components. These include front, side, and knee airbags, seatbelt pretensioners, as well as acceleration and pressure sensors distributed throughout the vehicle.

In the event of a collision, the A2079010100 control unit determines within milliseconds which restraint systems must be activated to provide optimal occupant protection. After deployment, it also permanently stores so‑called crash data, which plays a crucial role in diagnosing subsequent faults.

Why does the A2079010100 control unit fail?

The most common cause of failure for the A2079010100 control unit is stored crash data following an accident, which locks the device. Other causes include internal electronic defects in circuit board components, resulting from wear or electrical disturbances in the vehicle’s onboard network.

The primary reason for malfunction is a system‑level lockout. After an accident involving deployed airbags or seatbelt pretensioners, the control unit writes crash data into its internal memory. This lockout is intentionally designed by the manufacturer and can only be reset through specialized repair procedures.

Besides this software‑based blockage, hardware defects may also occur. These include circuit board errors, faulty memory chips, or other electronic components that disrupt communication or functionality.

Similar control units on the W207 platform—such as those with part numbers A2079011700, A2079011900, and A2079012500—exhibit comparable fault patterns and are likewise repairable.

How do you recognize a defect in the A2079010100 control unit?

A defect in the A2079010100 control unit typically manifests as a constantly illuminated airbag warning light (SRS indicator). Often, the control unit can no longer be accessed by diagnostic equipment, or specific error codes such as “component defective” appear.

The clearest symptom is the persistently lit SRS warning light, which fails to extinguish even after starting the engine. This indicates a serious fault in the restraint system that compromises operational safety.

Another clear sign is when a workshop cannot establish communication with the airbag control unit. The device does not respond to diagnostic requests, suggesting either a complete internal failure or a lockout.

Additionally, the vehicle display may show error messages like “refer to the manual.” Sometimes, even after professionally replacing other system components—such as a knee airbag—the airbag warning light remains on, pointing directly to the control unit as the root cause.

Important note for workshop diagnostics: Before removing the control unit, check the connector contacts. Bent pins or corrosion can produce similar symptoms and should be ruled out as potential sources of failure.

In which vehicles is the A2079010100 control unit installed?

The A2079010100 airbag control unit was specifically developed for the Mercedes-Benz E-Class, model series A207. At Airbag24, we repair this control unit for the cabriolet model produced between 2010 and 2017, as well as technically related variants based on the W207 platform.

At Airbag24, repairs for this control unit are available for the following specific model:

Mercedes-Benz E-Class A207 Cabrio (model years 2010–2017)

What are the benefits of repairing the A2079010100?

Repairing the original A2079010100 control unit is the most economical and technically sensible solution. You save 50–70% compared to purchasing a new part, avoid time‑consuming reprogramming, and retain your vehicle’s original configuration.

A key advantage is substantial cost savings. While a new unit often costs €700–€800 more, repair offers an affordable alternative without compromising functionality.

Since the original control unit is repaired rather than replaced, there’s no need for complicated re‑coding or programming. After repair, the unit can simply be reinstalled (plug-and-play) and immediately functional.

You receive a 12‑month warranty on the completed repair, providing added peace of mind. By reusing the component, you also conserve valuable resources and act in an environmentally conscious manner.

How does the repair process work at Airbag24?

After the defective control unit A2079010100 has been removed in a specialized workshop, it is sent to Airbag24. Here, a professional analysis is performed, crash data is erased, electronic defects are repaired, and a final functional test is conducted before the unit is returned ready for installation.

The process begins with a skilled diagnosis and removal of the control unit at your workshop. You then send the securely packaged component along with the completed repair order to us.

At Airbag24, the control unit first undergoes an incoming inspection to verify the reported fault. Our technicians use specialized equipment to pinpoint the exact cause of the issue.

The actual repair involves clearing the crash-data lock and replacing any faulty electronic components on the circuit board. Each unit is meticulously restored according to the manufacturer’s specifications.

Following successful repair, the control unit undergoes a comprehensive functional test on a test bench. Only when all functions have been fully restored is it approved for return shipment. You receive a 12-month warranty on the repair.

What shipping options are available at Airbag24?

For hassle-free processing, you can either ship your control unit yourself free of charge or arrange a convenient UPS pickup at your preferred location. For return shipments, Airbag24 offers free standard UPS shipping as well as faster express options, including cash-on-delivery.

For outbound shipping, you have two choices: You can take the package to the post office yourself and send it to us at no cost, or you can use the convenient UPS pickup service, which collects the package directly from your location.

For return shipments, several options are available to suit your needs:

UPS Standard Shipping (1–3 business days) – This option is free of charge.

UPS Express Shipping (1–2 business days) – For exceptionally fast delivery.

UPS Standard Shipping with Cash-on-Delivery (1–3 business days).

UPS Express Shipping with Cash-on-Delivery (1–2 business days).

In addition, you have the option to pick up the repaired control unit in person at our facility.