Airbag control unit with part number 1679009428

What is the function of Airbag Control Unit 1679009428?

The airbag control unit with part number 1679009428, also known as A1679009428, serves as the central control module for the entire occupant safety system (SRS) in the Mercedes-Benz GLE of the C167 and V167 series. It processes signals from crash sensors and controls the deployment of airbags, seatbelt pretensioners, and the occupant classification system.

As the brain of the passive safety system, this module is responsible for making the right decisions within milliseconds in the event of a collision. It continuously analyzes data from acceleration and pressure sensors throughout the vehicle to assess the severity of an impact and activate the appropriate restraint systems.

The proper functioning of this control unit is therefore critical for passenger safety and a prerequisite for passing the main inspection. Failure will inevitably result in deactivation of the entire airbag system.

Why does control unit 1679009428 fail?

Failures of control unit 1679009428 are most often caused by stored, non‑erasable crash data following an accident, which locks the module. Other causes include internal electronic malfunctions, communication issues with the diagnostic tester, or software errors that necessitate repair rather than costly replacement.

The most common reason for an apparent fault is the storage of crash data. Even after minor accidents where no airbags deployed, the control unit may set an internal lock flag. This cannot be cleared using standard workshop scanners and requires specialized electronic diagnostics.

In addition, hardware defects on the circuit board can occur. Moisture, pre‑existing damage from improper repair attempts, or failure of individual electronic components can lead to total malfunction or communication problems.

It’s important to note that control units from previous models, such as the W166/GLE (e.g., A1669002103), are not compatible—even if their functions appear similar. Each defect requires specific diagnosis of the installed unit.

How do you recognize a fault in airbag control unit 1679009428?

A fault in control unit 1679009428 primarily manifests as a permanently illuminated or intermittently flashing airbag warning light (SRS indicator) in the instrument cluster. Often, the control unit can no longer be read by a diagnostic tool (no communication), or internal error codes are stored.

The most obvious symptom is the active airbag warning light, signaling to the driver that the safety system is either non‑functional or only partially operational—and may fail to deploy in the event of a crash.

Another clear sign is complete loss of communication. If the workshop attempts to read the fault memory, no response is received from the SRS module, indicating a serious internal issue.

In other cases, communication may still be possible, but error codes remain stored in the fault memory, pointing to an internal defect within the control unit itself. Even after an accident, non‑erasable crash data might persist as faults, despite the unit otherwise appearing intact.

In which models is airbag control unit 1679009428 installed?

Airbag control unit 1679009428 is specifically designed for newer models of the Mercedes-Benz GLE class. It is mainly used in the GLE SUV Coupe (C167) from model year 2019 onward, as well as in the standard SUV variant (V167) from model years 2018/2019 onward.

At Airbag24, we repair part number 1679009428, which is installed in the following Mercedes-Benz GLE models:

Mercedes-Benz GLE Coupe (C167) – from model year 2019

Mercedes-Benz GLE SUV (V167) – from model year 2018

What are the advantages of repairing 1679009428?

Repairing airbag control unit 1679009428 offers significant cost savings compared to purchasing a new unit, which often costs several hundred euros. Since the original vehicle coding remains intact, there’s no need for time‑consuming reprogramming. Additionally, refurbishment conserves resources and comes with a 12‑month warranty.

A new unit typically requires complex online coding through an authorized dealer and must be matched to the vehicle. In contrast, repairs preserve the original configuration, so the control unit is usually fully functional immediately after installation (plug-and-play).

Compared to buying a used control unit, repairs also provide benefits. You never know what history a used part has—crash data may already be stored, or latent defects could exist. Professional refurbishment restores the original functionality and is backed by a warranty.

How does the repair process work at Airbag24?

At Airbag24, the repair of control unit 1679009428 begins after removal and shipment. Our technicians perform a precise diagnosis, erase persistent crash data, resolve electronic faults, and conduct final functional tests. You receive a fully operational component back, covered by a 12-month warranty.

The process is straightforward: following an initial diagnosis at your workshop and removal of the defective unit, you send it to us. It’s advisable to read out the fault memory before removal and include the results with the package.

In our specialized workshop, our technicians analyze the control unit at both hardware and software levels. Stored crash data is erased using specialized equipment, and any faulty components on the circuit board are expertly replaced. After successful repair, the module undergoes comprehensive quality control to ensure flawless operation.

What shipping options are available?

You can return your control unit to Airbag24 free of charge by mailing it yourself, dropping it off in person, or arranging a convenient UPS pickup. For the return shipment, we offer free standard UPS shipping as well as optional express delivery, including cash-on-delivery. Self-collection is also possible.

For the outbound shipment, you have two choices: either send the package to us yourself or use our convenient pickup service. Simply book a UPS pickup online from your preferred location—whether it’s your workshop or your home.

After repair, we promptly ship the control unit back to you. Free standard UPS shipping is our default option. If you need the component urgently, various UPS express services are available. Of course, you can also pick up the repaired unit in person at our facility.