Airbag control unit with part number MR587731

What does the airbag control unit MR587731 do?

The airbag control unit MR587731 controls the restraint system (SRS) for Mitsubishi. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered. After an accident it stores crash data and locks itself.

In addition, it monitors the system continuously and shows detected faults via the airbag warning light.

It is thus the central point where all sensor and trigger signals come together.

Why does the control unit MR587731 fail?

Stored crash data is the most common cause, because the unit records it after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Further causes are ageing components, cold solder joints, moisture at plug connections and voltage spikes.

Stored crash data remains in memory until it is removed during a repair. It is therefore the starting point of every fault search.

The other causes act over a longer period. Components age, solder joints can go cold, and voltage spikes stress the unit.

How can you tell that the MR587731 is defective?

The airbag warning light stays on constantly or intermittently, and an error message appears in the instrument cluster. In addition, no connection to the control unit is established, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

A light that does not go out after starting indicates the fault. Have the system checked promptly so that the cause is established.

Which vehicles is the MR587731 fitted in?

The control unit MR587731 is fitted in these vehicles: Mitsubishi Outlander CU (2001-2006).

The list shows which vehicles are recorded for this number.

• Mitsubishi Outlander CU (2001-2006)

Compare the part number on the label of the removed unit with this page, and you will know it is the right unit. Have the fault memory read out beforehand. Only this result 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 MR587732, MR587868, W2T61972.

How does the repair of the MR587731 work?

The fault memory is read out first, and the log is attached. Then disconnect the battery and only afterwards remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

Afterwards create a repair order online and send in the unit well packed. Airbag24 checks it on the test bench, replaces defective components, removes stored crash data and carries out a function test. Then your own unit is sent back.

The 3–4 working days refer only to this work at Airbag24.

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 MR587731 get to Airbag24?

You send the unit in as a parcel or book a collection by UPS for an extra charge. After the repair Airbag24 returns it to you by UPS. Put the printed repair order into the parcel, and pack the unit shock-proof.

Sturdy packaging with sufficient padding protects the control unit in transit.