Airbag control unit with part number MB339510

What is the function of the airbag control unit MB339510?

The airbag control unit with part number MB339510 is the central control unit for the occupant protection system of the Mitsubishi Pajero V20. Its task is to continuously evaluate data from crash sensors and, in the event of an accident, to trigger the airbags and seatbelt pretensioners precisely and within milliseconds.

The MB339510 control unit is the brain of the passive safety system. It constantly monitors all connected components, such as the acceleration sensors at the front and sides of the vehicle, the seat occupancy detection, and the ignition circuits of the individual airbags and seatbelt pretensioners.

The device only sends ignition signals when the data provided by the sensors matches a predefined accident profile. This precise control ensures that the restraint systems are activated only when absolutely necessary to protect the occupants.

Why does the MB339510 control unit fail?

The most common causes of failure for the MB339510 control unit are internal hardware defects, particularly in the memory modules, as well as the storage of crash data after an accident. The Mitsubishi-specific error code B1498 directly indicates a defect in the ROM or RAM chips on the circuit board.

A major issue with this control unit concerns its internal memory components. The B1498 error code stored in the fault memory serves as a clear indicator of a ROM or RAM malfunction in Mitsubishi models. This means that the memory chips storing the operating software and vehicle-specific data are either physically damaged or no longer functioning correctly.

Another frequent cause of malfunctions is the irreversible storage of crash data following an accident. Once the control unit has deployed the airbags, it locks itself internally to prevent further use. This condition is also flagged as a defect and must be reset through specialized intervention.

In both cases—whether it’s a hardware defect in the memory or stored crash data—the root cause lies directly within the control unit itself and cannot be resolved through software updates or reprogramming.

How can you recognize a defect in the MB339510?

A defective MB339510 airbag control unit typically manifests as a permanently illuminated airbag warning light on the instrument panel. Additionally, it is common for the control unit to stop responding to diagnostic equipment requests, making communication impossible.

The most obvious sign of a problem is the red airbag warning light. It fails to turn off after starting the engine, indicating that the entire restraint system is inactive and would not deploy in the event of an accident.

Another clear symptom is the lack of communication with workshop diagnostic tools. When a workshop attempts to read the fault memory, the control unit either cannot be detected or access is denied. This loss of communication confirms a serious internal defect.

In which models is the MB339510 installed?

The airbag control unit with part number MB339510 was specifically developed for one vehicle series. It is used exclusively in the second-generation Mitsubishi Pajero SUV, known as the V20. Affected model years range from 1990 to 2000.

At Airbag24, we repair the MB339510 control unit for the following model:

Mitsubishi: Pajero V20 (model years 1990–2000)

How is the MB339510 professionally repaired?

During professional repair of the MB339510 at Airbag24, the unit first undergoes a thorough electronic analysis. Depending on the nature of the fault, crash data is carefully erased, or defective hardware components—such as memory chips on the circuit board—are replaced. Final tests ensure full functionality.

After being sent to Airbag24, each control unit follows a standardized process. First, a detailed diagnosis identifies the exact cause of the failure, determining whether it involves stored crash data or an actual hardware defect like the aforementioned ROM/RAM issue.

The next step is the actual restoration. Stored crash data is erased at the chip level, returning the control unit to its factory settings. For hardware defects, faulty components—such as memory chips—are expertly desoldered and replaced with new, specification‑compliant parts.

Following repair, the control unit is tested on a test bench to confirm flawless operation across all functions. We provide 2 years' statutory liability for defects on all repairs performed.