Airbag control unit with part number 28556VK300

What is the function of the Airbag Control Unit 28556VK300?

The airbag control unit with part number 28556VK300 is the central control module for the passive safety system in certain Nissan models, such as the Navara D22. It processes signals from crash sensors to precisely deploy airbags and seatbelt pretensioners in the event of a collision. A verified, interchangeable OEM part number is 98820-EB01D.

As the heart of the restraint system, this control unit continuously monitors data from acceleration sensors distributed throughout the vehicle. When the electronics detect a collision exceeding predefined thresholds, it sends ignition pulses to the corresponding airbag modules and seatbelt pretensioners within milliseconds. This rapid and reliable response is critical for occupant protection.

The unit is specifically tailored to the vehicle architecture of the Nissan Navara and D22-series pickup trucks. Its internal electronics, often supplied by manufacturers like Denso—typical for Nissan—ensure proper processing of sensor signals and safe operation of the entire system.

Why does the Control Unit 28556VK300 fail? Common Defects

The most common cause of failure for the 28556VK300 control unit is the storage of crash data after an accident, which permanently locks the device. Other defects include internal electronic malfunctions, water damage, or complete loss of communication with the vehicle’s diagnostic system.

Following a crash in which the airbags have deployed, the control unit irrevocably writes so‑called crash data into its internal memory. This safety measure prevents reuse without professional inspection and repair. The result is a persistently illuminated airbag warning light and a non‑functional system.

Beyond accidents, hardware failures can also occur. Water ingress due to leaks inside the vehicle leads to corrosion on the circuit board and failure of electronic components. Similarly, age‑related material fatigue or voltage spikes may cause internal faults or total communication failure, leaving the unit unresponsive to diagnostic equipment.

How do you recognize a defect in the 28556VK300?

A defect in the 28556VK300 airbag control unit primarily manifests as a constantly illuminated airbag warning light on the instrument cluster. Additional symptoms include specific fault codes stored in the error memory indicating an internal control unit malfunction, or a workshop’s inability to access the module via diagnostic equipment.

The most obvious sign is the airbag warning light that fails to turn off after the engine starts. This indicates a serious fault in the restraint system, compromising occupant safety. In this state, the system is typically fully disabled.

During diagnostics at a workshop, the issue often appears as fault codes directly pointing to a defect within the control unit itself, such as “Internal Error” or “Crash Data Stored.” In some cases, the control unit becomes completely unresponsive, and the diagnostic tool reports “No Communication” with the airbag module.

In which vehicles is the 28556VK300 installed?

The 28556VK300 airbag control unit is an OEM component specifically designed for vehicles based on Nissan’s D22 platform. It is predominantly found in the Nissan Navara D22, its facelifted variant, and the mechanically identical Nissan Pick Up D22 over an extended production period.

At Airbag24, we repair the 28556VK300 control unit for the following Nissan models:

- Nissan Navara D22 (model years 1997–2000)

- Nissan Navara D22 Facelift (model years 2000–2005)

- Nissan Pick Up (D22) (up to model year 12/2006, e.g., models with a 2.5L engine, 98 kW/133 hp, and 4 doors)

How is the 28556VK300 control unit professionally repaired?

Professional repair at Airbag24 focuses on eliminating the exact root cause of the fault. Following an initial assessment, stored crash data is securely erased to restore factory settings. For electronic defects, affected components on the circuit board are replaced. Finally, each unit undergoes a comprehensive functional test.

After the defective control unit has been removed from the vehicle and sent to Airbag24, a standardized repair process begins. First, the unit is subjected to thorough diagnostics to determine whether crash data remains stored or if a hardware defect is present.

The core of the repair involves using specialized tools to remove crash data from the control unit’s memory. If electronic components are damaged, they are carefully desoldered and replaced with new, high‑quality parts. Once repairs are completed, the control unit is tested on a bench to ensure flawless operation of all circuits. We provide 2 years' statutory liability for defects on every repair.