What is a Nissan Dayz B21W airbag control unit?
The Nissan Dayz B21W airbag control unit is your vehicle's central safety unit, precisely activating all occupant restraint systems, such as airbags and seatbelt pretensioners, in the event of an accident. It continuously monitors sensors, stores relevant crash data, and ensures the proper functioning of the entire airbag system to provide maximum protection.
This electronic control unit is specifically designed for the Nissan Dayz B21W.
It processes real-time data from acceleration sensors and other safety systems.
The operating voltage is usually 12V, and it communicates via the vehicle's CAN bus system.
Why is the Nissan Dayz B21W airbag control unit defective?
A Nissan Dayz B21W airbag control unit is often classified as defective because it stores irreversible crash data after an accident, preventing further operation, or because internal components fail due to age, short circuits, or overvoltage. This then leads to permanent error messages and the illumination of the airbag warning light.
After an airbag deployment event, so-called hard codes are stored in the control unit.
These codes prevent the security systems from being reactivated and can only be removed by specialized reset services, not by simple OBD scanners.
Internal defects can also cause the control unit to refuse communication or send out faulty signals, which makes an immediate Nissan Dayz B21W airbag control unit repair necessary.
Common error codes for Nissan Dayz B21W airbag control unit repair
Nissan Dayz B21W airbag control unit repairs often result in generic error codes that indicate communication problems or internal module defects, as specific model and part number codes are often not publicly available. These codes indicate that the airbag system is malfunctioning or blocked and requires diagnostics.
- B1000 → Control unit communication error → Airbag ECU
- B1015 → Airbag system faulty (control unit defective) → Airbag ECU
- B1139 → Airbag system faulty → Airbag ECU
These error codes are typical indicators of a failure or malfunction of the airbag control unit.
For an accurate diagnosis, specialized Nissan diagnostic tools in a specialist workshop are recommended.
Correcting these errors often requires resetting or replacing the module.
What part numbers are available for the Nissan Dayz B21W airbag control unit repair?
For Nissan Dayz B21W airbag control unit repair, the only 100% verified OEM part number is 98820-7MB0B, which comes directly from Nissan and has been confirmed for this specific model. Other numbers are either incomplete, not clearly attributable to the control unit, or represent supplier codes that make clear identification difficult.
This original OEM part number is provided in the context of reset services for the airbag control unit of the Nissan Dayz B21W.
There are currently no other alternative, clearly verified OEM part numbers publicly available for this specific airbag control unit.
For more detailed research or to search for supplier versions, we recommend consulting professional databases such as TecDoc or contacting a Nissan dealer.