Airbag control unit with part number 28556-3JA0A

What is the function of Airbag Control Unit 28556-3JA0A?

The Airbag Control Unit 28556-3JA0A, manufactured by Autoliv, is the central SRS module for the Nissan Elgrand E52. It continuously monitors data from the vehicle’s sensors to precisely and rapidly deploy the airbags and seatbelt pretensioners in the event of a collision. An alternative, compatible part number is 5WK44920 from Continental.

As the brain of the passive safety system (Supplemental Restraint System, SRS), this module interprets signals from acceleration and yaw rate sensors. Based on this data, it determines whether a crash has occurred and which restraint systems need to be activated to provide optimal occupant protection.

The proper functioning of the control unit is essential for vehicle safety. Therefore, when replacing or repairing it, it is crucial to ensure that the part number matches exactly. Using an incorrect part number can lead to serious malfunctions of the entire safety system.

Why does Control Unit 28556-3JA0A fail?

The most common cause of failure for Control Unit 28556-3JA0A is the storage of crash data after an accident, which activates the airbag warning light and locks the module. In addition, purely electronic faults in internal components such as sensors or the circuit board itself can also result in malfunction.

Following a collision—even minor ones where the airbags did not deploy—the control unit irrevocably writes a data record into its internal memory. This so‑called “crash lock” is a manufacturer‑imposed safety feature designed to prevent reuse without professional inspection.

Besides accidents, hardware defects may also occur. These include failures of electronic components on the circuit board, faulty internal sensors, or damaged solder joints. Such defects likewise trigger a permanent system error and illuminate the SRS warning light.

To ensure compatibility, repairs or replacements should only use units with the identical part number 28556-3JA0A or the alternative number 5WK44920. Other Nissan part numbers, such as 28556-5X00A or 28556-5X40A, are intended for different models and are incompatible.

How do you recognize a defect in 28556-3JA0A?

A defect in Airbag Control Unit 28556-3JA0A is unmistakably indicated by the permanently illuminated airbag warning light (SRS lamp) in the instrument cluster. Additionally, the control unit may no longer respond to diagnostic requests or display specific fault codes such as “internal error” or “crash data stored.”

The most obvious symptom is the active SRS warning light, which fails to turn off after the engine starts. This alerts the driver that the entire restraint system is disabled and will offer no protective function in the event of a crash.

During a workshop diagnosis, the diagnostic tool may be unable to establish communication with the airbag control unit. If a connection is possible, fault codes are often logged—directly pointing to an internal hardware defect or stored crash data that cannot be cleared.

In which vehicles is 28556-3JA0A installed?

The Airbag Control Unit with part number 28556-3JA0A is specifically designed for use in the Nissan Elgrand of the E52 series. At Airbag24, this module is professionally repaired for all variants of this vehicle generation built from 2010 onward.

At Airbag24, we repair both part number 28556-3JA0A and the compatible Continental number 5WK44920 for the following model:

Nissan: Elgrand E52 (model years 2010–present)

How does repair work at Airbag24?

Repair of Control Unit 28556-3JA0A at Airbag24 involves precise electronic analysis upon receipt. Depending on the findings, either the stored crash data is professionally erased or defective electronic components on the circuit board are replaced. Final tests guarantee full functionality, backed by 2 years' statutory liability for defects.

The process begins with removing the defective control unit from the vehicle. You can then send the module directly to us without prior registration. Careful packaging is essential to avoid transport damage.

Upon arrival at Airbag24, our technicians perform a comprehensive diagnosis. If crash data is stored, the unit’s memory is reset to factory settings. If an electronic fault is detected, the defective components on the circuit board are identified and replaced with new, high‑quality parts.

After successful restoration, each control unit undergoes a final functional test to confirm proper operation. Repair offers a cost‑effective and sustainable alternative to expensive new purchases and typically does not require subsequent coding in the vehicle.