Airbag control unit with part number 285001290

What is the function of Airbag Control Unit 285001290?

The Airbag Control Unit 285001290 is the central control module for the passive safety system (SRS – Supplemental Restraint System) in the Mitsubishi Carisma. It continuously analyzes data from the acceleration sensors and, in the event of a crash, determines whether and which restraint systems—such as airbags and seatbelt pretensioners—should be deployed.

As the “brain” of the airbag system, it ensures the vital function of passive safety. Proper operation is critical, since a malfunction could leave the airbags deactivated in an emergency, offering no protection.

Why does Control Unit 285001290 fail?

The most common causes of failure for Control Unit 285001290 are internal hardware defects. These include short circuits caused by moisture, damage due to undervoltage from the vehicle battery, faulty wiring or connectors, and memory lockout after an airbag deployment during a crash.

Electronic failures can result from external factors such as water ingress, which leads to corrosion and short circuits on the circuit board, damaging sensitive components.

Another typical source of trouble is an unstable power supply—for example, from a defective battery or alternator—which can permanently harm the unit’s delicate electronic parts.

Mechanical issues like broken cables or corroded connectors between the control unit and the SRS sensors can also impair functionality and trigger error messages.

Following a crash where the airbags have deployed, the unit stores so‑called crash data and locks itself out. This is a safety‑critical feature that requires professional resetting or replacement of the device.

In addition to part number 285001290, related control units with numbers 285001286, 285001127, and 285001235 are compatible and subject to similar defects.

How do you recognize a fault in Airbag Control Unit 285001290?

A defect in Control Unit 285001290 primarily manifests as a constantly illuminated airbag warning light on the instrument cluster. Often, the fault memory cannot be cleared, or communication with the diagnostic tool is lost. The specific error code B1000 also indicates an internal problem.

The clearest sign is the airbag warning lamp that fails to turn off after starting the engine. This signals a critical fault in the safety system that must be promptly inspected at a specialized workshop.

In many cases, workshops can no longer access the control unit via diagnostic equipment. This lack of communication prevents accurate fault analysis and points to a severe internal defect within the unit.

Another symptom may be the simultaneous flashing of the engine check light and the airbag light, indicating a more complex electronic issue originating from the control unit.

Often, the error code B1000 (internal fault) remains stored in the memory. This cannot be erased using standard workshop testers and requires expert repair.

In which vehicles is Control Unit 285001290 installed?

The Airbag Control Unit with part number 285001290 was specifically developed for the Mitsubishi Carisma model years 1995–2004. At Airbag24, this control unit is professionally repaired for all relevant model generations, restoring full functionality to the safety system.

At Airbag24, repairs are offered for the following Mitsubishi Carisma series:

Mitsubishi Carisma DA1A (1995–1999)

Mitsubishi Carisma DA2A (1999–2002)

Mitsubishi Carisma DA2A (2002–2004)

How is Control Unit 285001290 professionally repaired?

Professional repair at Airbag24 includes a systematic diagnosis to precisely locate the fault. Defective electronic components on the circuit board are then replaced, stored crash data is erased, and all system components are thoroughly inspected. Two years' statutory liability for defects is provided on the repair.

Upon receipt of the removed control unit at Airbag24, experienced technicians perform a comprehensive initial inspection using specialized diagnostic tools. This ensures that the exact source of the fault is identified at the hardware level.

The next step involves component-level repair. Faulty components, wiring, or connectors are expertly replaced or refurbished to restore original functionality.

If the control unit has been locked due to an accident, all stored crash data is completely and securely erased from memory. The unit is then fully functional again and behaves like a brand-new part.

Important safety note: Vehicle manufacturers stipulate that, following deployment in a traffic accident, an airbag control unit must generally be replaced with a new spare part. Only in this way can its full functionality in the event of a future impact be guaranteed beyond any doubt.