Airbag control unit with part number 285001420

What is the function of Airbag Control Unit 285001420?

The airbag control unit with part number 285001420 is the central control module for the occupant protection system in the Nissan Primera P12 (model years 2002–2007). It continuously monitors crash sensors, controls the deployment of airbags and seatbelt pretensioners, and performs ongoing system diagnostics to ensure operational readiness.

As the brain of the passive safety system, this module processes data from acceleration and pressure sensors within milliseconds. When a collision exceeds predefined thresholds, the control unit sends ignition signals to the corresponding airbags and seatbelt pretensioners. At the same time, it activates the airbag warning light (SRS indicator) on the instrument cluster if a system fault is detected.

The proper functioning of this component is critical for driver safety, as failure or malfunction could result in airbags not deploying—or deploying incorrectly—during an actual crash.

Why does control unit 285001420 fail?

The most common cause of failure for control unit 285001420 is stored crash data following an accident, which permanently locks the device. Other causes include internal hardware defects in electronic components such as microcontrollers or capacitors, often due to aging or moisture exposure.

After a crash, the unit stores event data in a non-erasable memory area. This hardware-based lock ensures safety by preventing further use without professional inspection and repair. Simply clearing the fault memory is no longer sufficient.

Electronic components on the circuit board can also fail due to aging, vibration, or moisture. Defective capacitors, poor solder joints, or issues with the microcontroller can trigger an internal error that disables the entire airbag system.

For repair, in addition to part number 285001420 (also known as 0285001420), the following equivalent part numbers are relevant: 98820-AV200, 98820-AV21A, 98830-AY000, and 285003019.

How do you recognize a defect in control unit 285001420?

A defect in control unit 285001420 primarily manifests as a permanently illuminated or flashing airbag warning light (SRS) on the dashboard. Often, communication with the control unit via a diagnostic tool is also lost, and error codes such as “internal error” cannot be cleared.

The most obvious sign is the activated airbag warning light. It fails to turn off after starting the engine or begins to illuminate or flash during driving, indicating a critical fault in the restraint system.

Another clear symptom is the inability to perform diagnostics. If a workshop attempts to read the fault memory through the OBD interface, they frequently receive messages like “No communication with airbag control unit” or are unable to establish a connection.

The fault memory often contains entries such as “Internal control unit error” or “Crash data stored.” These error codes are permanent and cannot be erased using standard diagnostic tools, pointing to a severe defect within the control unit itself.

In which vehicles is control unit 285001420 installed?

The airbag control unit with part number 285001420 and its equivalents is specific to the Nissan Primera P12 model produced between 2002 and 2007. At Airbag24, we specialize in professionally overhauling this control unit for this particular vehicle model.

At Airbag24, we repair part number 285001420 for the following model:

Nissan Primera P12 (model years 2002–2007)

Is repairing control unit 285001420 worthwhile?

Yes, repairing control unit 285001420 is highly cost-effective. It saves 70–90% compared to purchasing a new unit, which often costs over €500. After repair, the device is fully functional again and requires no re-coding.

A new factory‑made control unit is not only expensive but often needs vehicle‑specific coding, adding extra workshop costs. Repair offers a plug-and-play solution: the refurbished original unit is simply reinstalled and ready to operate immediately.

The overhaul fully restores the original functionality. All repairs also come with 2 years' statutory liability for defects, providing additional peace of mind.

How does the repair of control unit 285001420 proceed?

Upon submission to Airbag24, control unit 285001420 undergoes a comprehensive diagnostic examination. This is followed by professional repair, including erasing crash data and replacing defective components. After successful functional testing, the unit is returned with 2 years' statutory liability for defects.

The process ideally begins with a diagnosis at a specialized workshop to confirm that the control unit is indeed the source of the fault. Afterward, please send the removed unit along with a printout of the error log.

At Airbag24, our technicians analyze the circuit board and the stored data. The repair involves resetting the crash data at the hardware level and replacing any defective electronic components through soldering. Final tests ensure the device’s full functionality.

The repaired control unit is returned ready for installation. Re‑coding is not required. Following installation, you only need to clear the vehicle’s fault memory once.