Airbag control unit with part number 98820BK00A

What is the function of the airbag control unit 98820BK00A?

The airbag control unit with part number 98820BK00A is the central control module for the passive safety system (SRS) in the Nissan Qashqai J11. It is responsible for processing crash sensor data and precisely activating airbags and seatbelt pretensioners in the event of a collision.

This unit, often referred to as the SRS Control Unit, continuously monitors all connected sensors and components of the restraint system. In the event of a collision, it determines within milliseconds which safety devices need to be deployed to provide optimal protection for occupants. Additionally, it stores relevant event and fault data in its internal memory.

Why does the control unit 98820BK00A fail?

The most common cause of failure for the control unit 98820BK00A is the storage of crash data after an accident, which triggers an internal lockout. Other causes include internal defects in electronic components, moisture damage, or improper repair attempts in the past.

Following a collision—even minor ones—the control unit is locked for safety reasons. It permanently stores crash event data in its internal memory and must be professionally reset to restore full functionality.

Over time, components on the circuit board, such as capacitors or memory chips, may also degrade. This leads to internal malfunctions that manifest as specific diagnostic trouble codes like B1015, B1139, or B1157 (airbag control unit malfunction) in the fault memory.

External factors, such as penetrating moisture, can cause corrosion on the circuit board, while mechanical stress or previous repairs can damage the sensitive electronics and result in total failure.

How do you recognize a defect in the 98820BK00A?

A defect in the control unit 98820BK00A typically presents as a constantly illuminated airbag warning light on the instrument cluster. Communication with a diagnostic tool may also become impossible, or persistent error codes appear that cannot be cleared.

The primary indicator is the airbag warning light, which fails to extinguish after starting the vehicle or re-illuminates shortly thereafter—usually within about 30 seconds. This signals a critical system error.

Another clear sign is when a workshop using an OBD diagnostic tool cannot establish communication with the airbag control unit. The device no longer responds to queries, preventing accurate fault analysis.

In cases where communication is still possible, internal error codes such as B1015 (airbag control unit malfunction) are often stored. These cannot be cleared using standard workshop tools because they point to an internal hardware or memory defect.

Rarely, atypical symptoms may occur, such as a faintly glowing warning light or persistent error messages that persist even after replacing other components like the coil spring.

In which vehicles is the control unit 98820BK00A installed?

The airbag control unit with part number 98820BK00A is specifically designed for the second-generation Nissan Qashqai platform (J11). It is used in both pre-facelift models and later revised versions.

At Airbag24, we service part number 98820BK00A for the following Nissan Qashqai series:

Nissan Qashqai J11 (model years 2013–2017)

Nissan Qashqai J11 Facelift (model years 2017–2021)

What are the advantages of repairing versus replacing with a new unit?

Repairing the original control unit 98820BK00A is the most economical and technically sensible solution. It saves significantly compared to purchasing an expensive new unit and eliminates the need for complex re-coding on the vehicle.

A new OEM unit can cost over 500 euros. Repair offers a much more affordable alternative that restores the original component’s full functionality.

Since the vehicle-specifically coded original unit is refurbished, there is no need for time-consuming re-learning procedures required with new or used replacement parts. After repair, the control unit can be directly reinstalled (plug-and-play).

Professional refurbishment reliably addresses known weaknesses and comes with 2 years' statutory liability for defects, providing maximum assurance and restoring full functionality to the entire airbag system.

How is the control unit 98820BK00A professionally repaired?

Professional repair of the control unit 98820BK00A at Airbag24 includes precise fault diagnosis, erasure of stored crash data, replacement of defective electronic components, and a comprehensive functional test on a specialized test bench.

Upon receipt of the control unit at Airbag24, a detailed analysis is performed to identify the exact cause of the fault down to the component level.

In the next step, the internal crash data is erased and the unit is unlocked. Defective hardware components on the circuit board, such as capacitors or memory chips, are professionally replaced with new, high-quality parts.

The device’s software is inspected and reprogrammed if necessary to fully restore its original functionality in accordance with the manufacturer’s specifications. Subsequently, all relevant solder joints are checked and renewed.

Finally, a simulation test is conducted to verify all functions of the control unit under real-world conditions. Each repair comes with 2 years' statutory liability for defects.