Airbag control unit with part number MR913789

What does the airbag control unit MR913789 do?

The airbag control unit MR913789 coordinates the restraint system (SRS) of Mitsubishi. It evaluates the signals from the crash sensors, decides within milliseconds in a crash which airbags and seatbelt pretensioners fire, and monitors the system continuously. After an accident, it stores crash data and locks itself.

The unit shows faults in the restraint system via the airbag warning light in the instrument cluster. That is why its functionality is of central importance for occupant protection.

The housing also carries the manufacturer number Bosch 0285001286. You will find this information on the removed unit.

Why does the control unit MR913789 fail?

Most often the cause for MR913789 is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase them. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example with a weak battery or jump starting.

Whether crash data are present is shown by reading the fault memory. The other causes act on the electronics over a longer period.

How can you tell that the MR913789 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently, an error message appears in the instrument cluster, or the fault memory cannot be cleared. The diagnostic tool may then find no connection to the control unit MR913789, and airbags and seatbelt pretensioners may fail to deploy in an emergency.

The light is the signal the control unit itself gives as soon as it detects a fault. A defective wiring harness or a loose plug can also switch it on; the diagnosis shows which cause applies.

Which vehicles is the MR913789 fitted in?

The control unit MR913789 is fitted in these vehicles: Mitsubishi Carisma DA2A (1999-2002), DA2A (2002-2004) and DA1A (1995-1999).

The vehicles to which this part number belongs are listed below.

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

Compare the part number on the label of the removed unit with this page; that only confirms it is the right unit. Also have the fault memory read out before removal, because the result shows whether the control unit itself is defective or a plug or cable is the cause.

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

How does the repair of the MR913789 work?

For the control unit MR913789, first read out the fault memory and enclose the log, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the unit in, well packed. At Airbag24, processing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Afterwards your own unit comes 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 MR913789 get to Airbag24?

You send the control unit MR913789 either as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the control unit shockproof.