Airbag control unit with part number MR309115

What does the airbag control unit MR309115 do?

The airbag control unit MR309115 acts as the central unit of the restraint system (SRS) in Mitsubishi. It receives the signals from the crash sensors, determines within milliseconds in an accident the triggering of airbags and seatbelt pretensioners, and continuously monitors the condition of the system. It shows detected faults on the airbag warning light.

The manufacturer number Bosch 0285001235 is additionally noted on the housing.

After an accident the unit stores crash data and locks itself.

Why does the control unit MR309115 fail?

The most common cause is crash data from an accident that remain in the memory, even without an airbag triggering. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

An ordinary diagnostic tool cannot erase the crash data. The other causes affect components and connections over time.

Voltage spikes occur, for example, with a weak battery or a jump start. Airbag24 erases the crash data during the repair.

How can you tell that the MR309115 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, or a fault message appears in the instrument cluster. In addition, the diagnostic tool cannot connect to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

These signs justify a prompt check, even if the car runs normally in everyday use.

Which vehicles is the MR309115 fitted in?

The control unit MR309115 is fitted in Mitsubishi, specifically in these vehicles: Mitsubishi Carisma DA2A (1999-2002), DA2A (2002-2004) and DA1A (1995-1999).

The list that follows shows the vehicles assigned to this part number.

• Mitsubishi Carisma DA2A (1999-2002)
• Mitsubishi Carisma DA2A (2002-2004)
• Mitsubishi Carisma DA1A (1995-1999)

Comparing the part number on the label of the unit with this page ensures that you have removed the right unit. Only a read-out fault memory shows whether the control unit itself is defective or whether a plug or cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 285001127, 285001235, 285001286, 285001290.

How does the repair of the MR309115 work?

It begins with reading out the fault memory; enclose the log. Then disconnect the battery and only then remove the control unit. Finally, create a repair order online and send the well-packed unit.

Airbag24 places the unit on the test bench, repairs defective components, erases the crash data and tests the function. Processing usually takes 3–4 working days at Airbag24. Your own unit then goes back to you. Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit MR309115 get to Airbag24?

The control unit goes to Airbag24 as a parcel, or UPS collects it for an extra charge. After the repair, the unit comes back by UPS.

Put the printed repair order in the box and pack the control unit shockproof.