Airbag control unit with part number MR277718

What does the airbag control unit MR277718 do?

The airbag control unit MR277718 is the control unit of the restraint system for Mitsubishi. It evaluates the crash sensors, determines within milliseconds in an accident whether the airbags and seatbelt pretensioners are triggered, and checks all components of the system. After an accident, it stores crash data and locks itself.

The monitoring continues in the background, even when no warning light is lit. If the system reports a fault, it appears via the airbag warning light in the instrument cluster. The lock is lifted only by a repair.

Why does the control unit MR277718 fail?

The most common cause of the MR277718 failing is that crash data remained stored after an accident, even without a triggered airbag. A normal diagnostic tool does not remove it. Added to this are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is the result of the accident, not a question of wear. Airbag24 erases it during the repair. Whether one of the other causes is behind the fault is only determined by the inspection. The overview:

• aging of the electronics
• cold solder joints
• moisture and corrosion in plugs
• voltage spikes, for example during jump-starting

How can you tell that the MR277718 is defective?

A defect in the MR277718 shows up as the airbag warning light in the instrument cluster, as an error message, or as a missing connection to the diagnostic tool. In an emergency, the airbags and seatbelt pretensioners may then fail to trigger.

The signs at a glance:

• airbag warning light that stays on constantly or intermittently
• error message in the display
• diagnostic tool that makes no contact with the control unit
• fault memory that cannot be cleared

Have such an indication checked promptly. The light is there precisely to make faults visible.

Which vehicles is the MR277718 fitted in?

The airbag control unit MR277718 is fitted in these vehicles: Mitsubishi L400 Space Gear (1994-2005). You can easily check whether your vehicle is among them using the label on the unit.

The following list shows the vehicles for this number.

• Mitsubishi L400 Space Gear (1994-2005)

Compare the part number on the unit with this page so that you have the correct control unit. Have the fault memory read out beforehand, because only the log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers MR277719.

How does the repair of the MR277718 work?

First read out the fault memory and enclose the log, then disconnect the battery and remove the control unit MR277718; afterwards create a repair order online and send the unit in. Processing at Airbag24 usually takes 3–4 working days, during which the unit is inspected, repaired and tested.

The procedure serves your safety, because removal only takes place after the battery has been disconnected. Airbag24 erases the crash data during the repair, and the unit then undergoes a function test.

Your own unit is then returned 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 MR277718 get to Airbag24?

You send the control unit MR277718 yourself as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit to you by UPS.

Enclose the printed repair order with the parcel. Pack the control unit shock-resistant so that it arrives undamaged.