Airbag control unit with part number MR318479DPSB

What is the function of the airbag control unit MR318479DPSB?

The airbag control unit MR318479DPSB, also known as the SRS module, is the central control unit for the occupant protection system in the Mitsubishi Space Star DG. It processes signals from crash sensors and deploys the airbags and seatbelt pretensioners in the event of a collision. It is also recognized under the alternative OEM number 8635A234 and the Bosch number 0285001244.

As the “brain” of the safety system, this control unit continuously monitors data from the vehicle’s acceleration and yaw rate sensors. If the electronics detect a collision exceeding predefined thresholds, the module sends ignition pulses to the appropriate airbags and seatbelt pretensioners within milliseconds, providing optimal protection for occupants.

The proper functioning of this component is critical for safety. A failure or malfunction disables the entire airbag system, which can have severe consequences in the event of an accident. Therefore, prompt repair upon detection of defects is essential.

Why does the control unit MR318479DPSB fail?

A common reason for repairing the MR318479DPSB control unit is stored crash data following an accident, which prevents further operation. Other causes include internal electronic faults that result in persistent error codes (e.g., U1XXX, B1XXX), as well as physical damage caused by corrosion, water ingress, or short circuits in the vehicle’s electrical system.

After an airbag or seatbelt pretensioner deployment, the control unit stores so‑called crash data. This data permanently locks the module, preventing further use—even after the vehicle’s accident-related damage has been repaired. Such a lock is intentionally designed by the manufacturer and can only be reset through specialized electronic repair services.

Internal faults are another frequent cause of failure. Defective electronic components on the circuit board, issues with internal memory, or problems in the CAN bus system can all lead to improper operation. These defects often manifest as specific, non‑erasable error codes.

External factors—such as moisture from water damage, corrosion at connection points, or overvoltage due to polarity reversal or short circuits—can irreparably damage the control unit’s sensitive electronics, resulting in total failure.

How do you recognize a defect in the MR318479DPSB?

A defective airbag control unit MR318479DPSB typically shows up as a permanently illuminated or flashing SRS warning light on the instrument panel. Additionally, communication with the control unit via a diagnostic tool is often impossible, complicating troubleshooting. Non‑erasable error codes are another clear indication of an internal fault.

The most obvious sign is the airbag warning light (SRS light). If it remains lit after the engine starts, the system indicates a fault in the occupant protection system, meaning the airbags may not deploy in the event of a crash.

Another critical symptom is the lack of communication. When a workshop attempts to read the fault memory via the OBD port, the control unit may fail to respond. The diagnostic tool cannot access the unit, making precise fault diagnosis impossible and strongly suggesting an internal defect within the module.

Even when communication is possible, certain error codes point to an internal fault. Errors related to internal components, power supply, or communication that reappear immediately after being cleared confirm hardware damage inside the control unit itself.

In which vehicles is the MR318479DPSB control unit installed?

The airbag control unit with part number MR318479DPSB was primarily used in vehicles manufactured by Mitsubishi. At Airbag24, we specialize in repairing this specific module for the Mitsubishi Space Star DG model years 1999–2002, as well as for the DG facelift model produced from 2002 to 2006.

Accurate identification is crucial for successful repair. At Airbag24, we have successfully refurbished this control unit for the following models:

Mitsubishi Space Star DG (model years 1999–2002)

Mitsubishi Space Star DG Facelift (model years 2002–2006)

To ensure compatibility, always verify that the part number stamped on the control unit matches MR318479DPSB, the alternative OEM number 8635A234, or the Bosch equivalent 0285001244.

How does Airbag24 repair the MR318479DPSB?

At Airbag24, repairs to the MR318479DPSB follow a standardized process. After removal and shipment, the unit undergoes systematic analysis using precision measurement equipment. Depending on the findings, crash data is erased, defective components are replaced, and a final functional test is performed before returning the device with 2 years’ statutory liability for defects.

The process begins with the professional removal of the control unit at a workshop. You then send the securely packaged unit to us, along with a completed repair form that describes the fault symptoms.

Upon receipt at Airbag24, our technicians perform a comprehensive diagnosis. Using specialized testing equipment, all electronic components are inspected to pinpoint the exact source of the fault—whether it’s a stored crash data record or a physical defect on the circuit board.

Based on the diagnosis, professional repair is carried out. Stored crash data is reliably erased, and any defective electronic components are replaced with new, high-quality parts. After repair, each control unit undergoes a final functional test to ensure flawless operation.

The repaired and tested control unit is then returned to you. We provide 2 years' statutory liability for defects on every repair performed.