Airbag control unit with part number 285011550

What is the function of Airbag Control Unit 285011550?

Airbag Control Unit 285011550 is the central control unit (SRS ECU) for the passive safety system in the Mitsubishi ASX GA (from model year 2010 onward). It analyzes data from crash sensors and is responsible for precisely and promptly deploying airbags and seatbelt pretensioners in the event of a collision.

As the brain of the Supplemental Restraint System (SRS), this module continuously monitors all connected components, from impact sensors to individual airbag modules and seatbelt pretensioners. Its task is to detect a collision, assess its severity, and activate the appropriate restraint systems.

The control unit is specifically designed for the Mitsubishi ASX GA series. In repair contexts, part numbers 8635A215, 8635A569, 8635A321, and 285015091 are considered technically equivalent and interchangeable, as they are used in the same vehicles.

What defects occur with 285011550?

The most common defect of control unit 285011550 is stored crash data after an accident that cannot be erased using workshop diagnostic tools. Other typical failure causes include internal electronic faults leading to complete communication failure, as well as physical damage caused by water ingress or short circuits.

After an airbag or seatbelt pretensioner deployment, the unit permanently stores so‑called crash data. This lockout prevents further operation of the safety system and can only be lifted through specialized repair. Error codes such as U1XXX or B1XXX often indicate this issue.

Another critical fault is total loss of communication. Diagnostic tools (e.g., OBD, TECH2, BOSCH) receive no response from the control unit, signaling a severe internal hardware failure and making vehicle‑interface diagnostics impossible.

Physical impacts like water intrusion, corrosion at CAN‑bus connectors, or electronic damage resulting from reverse polarity during jump-starts can also lead to complete system failure. Such defects often manifest as internal error codes (e.g., B1557) or the aforementioned communication loss.

How do you recognize a defect in control unit 285011550?

A defect in control unit 285011550 is unmistakably indicated by the airbag warning light on the dashboard, which remains steadily illuminated or flashes. Another clear sign is when the workshop’s diagnostic tool cannot establish communication with the airbag system, pointing to an internal fault.

The primary and most visible symptom for the driver is the active SRS warning light, signaling that the entire airbag system is non‑functional and will not provide protection in the event of a crash.

In a professional workshop, the defect is further confirmed by the lack of communication. Attempts to read or erase fault memory fail with messages such as “Control unit does not respond” or “Control unit defective,” preventing further diagnosis of connected sensors and actuators.

In which models is control unit 285011550 installed?

The airbag control unit with part number 285011550, along with its mechanically identical variants, is specific to the Mitsubishi ASX GA series produced from model year 2010 onward. For this vehicle model, repair represents the most cost‑effective solution.

At Airbag24, the control unit with part number 285011550 is professionally refurbished for the following vehicle model:

Mitsubishi ASX (GA series, from model year 2010)

The repair capability also extends to the equivalent and interchangeable part numbers 8635A215, 8635A569, 8635A321, and 285015091, which were likewise installed in this model range.

How does the repair process work at Airbag24?

The repair process at Airbag24 begins with the submission of the removed control unit. This is followed by precise diagnostics, identifying crash data and hardware defects. Subsequently, errors are corrected, data is cleared, defective components replaced, and a final functional test performed.

Once the control unit arrives at Airbag24, technicians conduct a comprehensive incoming inspection, analyzing stored crash data, internal faults, and physical damage such as corrosion or short circuits on the circuit board.

The next step involves actual refurbishment: stored crash data is erased at the chip level, and the unit is unlocked. Defective electronic components, such as capacitors or damaged pins, are expertly replaced to restore original functionality.

Finally, each repaired control unit undergoes calibration and functional testing to ensure it operates like new and communicates flawlessly with the vehicle’s CAN bus. Airbag24 provides 2 years' statutory liability for defects on every repair.