Airbag control unit with part number 28556 8F000

What is the function of Airbag Control Unit 285568F000?

The airbag control unit with part number 285568F000 is the central control module of the safety system (SRS ECU), specifically designed for the Nissan Terrano R20. It processes sensor data to deploy airbags and seatbelt pretensioners in the event of a crash, and it locks itself after a collision for safety reasons by storing crash data.

As an OEM component from Nissan, this control unit is responsible for monitoring all components of the restraint system. It continuously analyzes signals from the acceleration sensors. When an impact exceeds predefined thresholds, the ECU sends critical ignition pulses to the corresponding airbag modules and seatbelt pretensioners.

A failure in this unit results in complete deactivation of the airbag system, indicated by the warning light, to prevent unintended deployments that could compromise occupant safety.

What types of failures occur in control unit 285568F000?

The most common issue is the storage of crash data after an airbag deployment, which prevents further use of the unit. Internal electronic faults also frequently appear, logged in the fault memory as code B1059 or “Internal Error,” requiring component-level repair.

A typical problem is the permanent retention of crash information in the internal memory. After a crash, this data cannot be erased using standard diagnostic equipment, rendering the control unit unusable until it undergoes professional reset.

Electronic malfunctions are another frequent cause. Defective components such as capacitors or processors on the circuit board can lead to total failure. This often manifests as Nissan-specific error code B1059, explicitly indicating an internal ECU fault.

In some cases, errors like B1049 (interruption in the driver airbag ignition circuit) may also appear. However, before removing the control unit, it’s crucial to have external sources of trouble—such as faulty cables, sensors, or seat occupancy mats—checked by a qualified workshop.

How do you recognize a fault in control unit 285568F000?

The clearest symptom is a permanently illuminated or flashing airbag warning light on the dashboard. Often, communication with the control unit via diagnostic equipment is no longer possible, or specific error codes such as B1059 (internal error) appear, signaling a defect within the unit.

The airbag warning light (SRS light) is the primary indicator. It does not turn off after starting the vehicle, signifying that the entire restraint system has been deactivated for safety reasons.

Another clear sign is the loss of diagnostic capability. If the workshop’s tester can no longer access the airbag control unit, this strongly suggests an internal hardware fault.

Even after a crash—whether only the seatbelt pretensioners deployed—the diagnostic tool often reports “crash data stored.” This entry cannot be cleared and requires specialized repair to restore functionality.

In which vehicles is control unit 285568F000 installed?

The airbag control unit with original part number 285568F000 was developed by Nissan specifically for one model. It is exclusively found in the Nissan Terrano R20, produced between 1993 and 2007. At Airbag24, repairs are tailored precisely to this vehicle.

Repair services at Airbag24 focus specifically on restoring functionality of this control unit for the following model:

Nissan: Terrano R20 (1993–2007)

How is control unit 285568F000 professionally repaired?

At Airbag24, repairs follow a standardized process: Following an initial inspection, stored crash data is erased and the unit is reset to factory settings. For hardware defects, faulty electronic components are replaced. Finally, a functional test ensures full operational readiness.

Once the control unit arrives at Airbag24, the fault memory is first read to pinpoint the exact cause. A diagnostic report provided by the workshop is extremely helpful in this regard.

The core of the repair often involves resetting the stored crash data by directly accessing the control unit’s memory chip. If an electronic fault is present, defective components such as processors or capacitors on the circuit board are desoldered and replaced with new, high-quality parts.

After restoration, the control unit undergoes thorough testing and calibration to ensure it functions flawlessly in real-world scenarios. All repairs come with 2 years' statutory liability for defects.