Airbag control unit with part number MR587491

What does the airbag control unit MR587491 do?

The airbag control unit MR587491 evaluates the signals from the crash sensors in Mitsubishi. Within milliseconds it decides whether airbags and seatbelt pretensioners are triggered, and it monitors the entire restraint system (SRS) in the process.

It detects faults and shows them via the airbag warning light. After an accident, it stores crash data and locks itself; the repair lifts the lock.

Why does the control unit MR587491 fail?

Stored crash data after an accident is the most common cause, even if no airbag has fired. It cannot be cleared with a normal diagnostic tool. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plugs, and voltage spikes.

The crash data stays in the unit until Airbag24 erases it during the repair. The electronics or one of the other causes mentioned can also trigger the failure.

How can you tell that the MR587491 is defective?

A defect shows up as the airbag warning light in the instrument cluster, which lights up permanently or intermittently. An error message in the instrument cluster, a diagnostic tool without connection to the control unit or a fault memory that cannot be cleared also indicate it.

In this state, airbags and seatbelt pretensioners may possibly not trigger in an emergency. The light therefore reports the defect; respond to it promptly.

Whether the control unit itself is the cause is shown by reading out the fault memory.

Which vehicles is the MR587491 fitted in?

The control unit MR587491 is fitted in these vehicles: Mitsubishi Grandis NA (2003-2011). This assignment derives from the part number, not from an examination of the individual vehicle.

These vehicles belong to this part number:

• Mitsubishi Grandis NA (2003-2011)

You can compare the part number on the label of the removed unit with this page. That only confirms the identity of the unit. Have the fault memory read out beforehand, so it becomes clear whether the control unit is defective or whether a plug or a cable is the trigger.

For the same vehicles, we also repair control units with the part numbers 2489104, MN141401, W2T62674.

How does the repair of the MR587491 work?

At Airbag24, checking, repairing and testing usually take 3–4 working days. Before removal, have the fault memory read out and disconnect the battery; then create the repair order online and send the unit in.

On the test bench, Airbag24 checks the unit, replaces damaged components, deletes the crash data and runs a function test. 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 MR587491 get to Airbag24?

You send the unit as a parcel, or book a UPS collection for an extra charge. After the repair, UPS brings the unit back to you.

The printed repair order goes into the parcel, and the unit is packed so that it withstands shocks.