Airbag control unit with part number 28556-ED000

What is the function of the airbag control unit 28556-ED000?

The airbag control unit with part number 28556-ED000 is the central control unit (SRS/ACU) for the passive safety system in the Nissan Tiida C12 series (from model year 2011 onward). It processes sensor data, deploys airbags and seatbelt pretensioners in the event of a crash, and stores relevant crash data.

This module serves as the brain of the entire restraint system. It continuously communicates with other vehicle systems, such as the engine control unit, to analyze driving dynamics and crash sensor signals in real time.

Its primary task is to assess the severity of an impact and, based on this analysis, precisely trigger the necessary restraint devices. These include front and side airbags as well as seatbelt pretensioners, ensuring optimal occupant protection.

Why does the control unit 28556-ED000 fail?

The most common cause of failure for the control unit 28556-ED000 is the storage of crash data after an accident. These “hard codes” lock the module and cannot be cleared using conventional diagnostic tools. Other defects include internal electronic faults that lead to communication issues.

After an accident in which airbags or seatbelt pretensioners have deployed, the control unit writes an irreversible entry into its internal memory. This entry locks the system to prevent reuse until professional repair or replacement is performed—a safety measure mandated by the manufacturer.

In addition to stored crash data, internal hardware failures may also occur. These often manifest as complete communication refusal, rendering the module unresponsive to diagnostic tools, or as the failure of individual electronic components on the circuit board.

A specific error code that may appear in conjunction with this control unit is B1052. This indicates an interruption in the driver’s airbag circuit. Before repairing the control unit, it is crucial to have a specialized workshop verify whether the root cause lies within the module itself or in peripheral components (e.g., wiring, sensors).

How do you recognize a defect in the 28556-ED000?

A defective airbag control unit 28556-ED000 typically manifests as a permanently illuminated airbag warning light (SRS lamp) on the instrument panel. Additionally, the control unit may become unreachable via the OBD interface, preventing diagnostic tools from establishing a connection.

The most obvious sign is the persistently lit airbag warning light. It illuminates during the ignition check but, unlike a functioning system, does not turn off afterward, signaling a critical system fault.

Another typical symptom is the complete loss of communication between the control unit and diagnostic tools. The workshop can then no longer read out error codes or perform system diagnostics, strongly suggesting an internal defect within the module.

In some cases, secondary symptoms may also appear, including a non-functioning clock, malfunctions during vehicle warm-up, a missing connection to the side airbags, or errors related to the seatbelt pretensioners.

In which vehicles is the control unit 28556-ED000 installed?

The airbag control unit with part number 28556-ED000 is specifically designed for the second-generation Nissan Tiida (C12 series) starting from model year 2011. At Airbag24, we offer professional repair services for this module, which is used in the aforementioned vehicle models.

Based on our technical data and repair experience, this control unit is specifically assigned to the following model:

Nissan Tiida C12 (from model year 2011)

Repair work at Airbag24 is precisely tailored to the unique technical characteristics of the 28556-ED000 control unit for this particular vehicle model.

Is repairing the 28556-ED000 worthwhile?

Yes, repair is the most economical and sustainable solution. Compared to purchasing a new part, you can often save up to 70%. After resetting the crash data and resolving any electronic faults, the repaired control unit is fully functional again and usually does not require re-coding.

The greatest advantage lies in significant cost savings. A new factory‑original control unit represents a substantial investment, whereas repair costs only a fraction of that amount while keeping the original component in the vehicle.

Following professional refurbishment, the control unit is ready for immediate use (“plug-and-play”). Since the original vehicle‑specific configuration remains intact, there is no need for the complicated and time‑consuming re‑learning process required when installing a new or used replacement part.

Airbag24 provides a 12-month warranty on every repair performed, giving you added peace of mind and underscoring the quality of our work.

How does the repair of part number 28556-ED000 proceed at Airbag24?

The process at Airbag24 begins with removing the control unit and sending it to us. Following an initial inspection, our technicians erase the stored crash data, address any electronic faults at the component level, and conclude with a comprehensive functional test.

Before removing the control unit, a specialized workshop should verify that the fault indeed originates from the module itself. To perform the removal, disconnect the vehicle battery. Wait a few minutes before detaching the often yellow or black connectors. The control unit is typically located beneath the center console, the dashboard, or one of the front seats.

Upon arrival of the package at Airbag24, the 28556-ED000 control unit undergoes meticulous analysis. Using specialized hardware and software, the internal memory chips (ICs) are read out, and all crash data is completely and thoroughly erased.

If additional electronic faults are detected during diagnosis, these too will be expertly repaired. Each repair is backed by a 12-month warranty.

What shipping options are available at Airbag24?

You can either ship your control unit to us free of charge yourself or arrange a convenient UPS pickup. For returns, we offer free standard UPS shipping as well as faster express options. All return methods also support cash-on-delivery.

Shipping to Airbag24: You have the choice of sending the securely packaged control unit to us yourself or having it picked up at your location. UPS pickup can be conveniently scheduled for your preferred time and date.

Free return shipping: After successful repair, we’ll send your control unit back to you via free standard UPS shipping. This service comes with no additional costs to you.

Optional shipping methods: If you need faster delivery, you can opt for UPS Express shipping. Both standard and express services are available—with an extra fee—for cash-on-delivery (payment upon receipt). Alternatively, you may choose to pick up the repaired part directly from our facility.