Airbag control unit with part number 98820-1MR0A

What does the airbag control unit 98820-1MR0A do?

The airbag control unit 98820-1MR0A controls the restraint system (SRS) for Infiniti. It measures accelerations via the crash sensors, decides in an impact whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit makes its decision within milliseconds. Between triggering events it checks the wiring and firing circuits for faults.

It indicates faults via the airbag warning light. After an accident it stores crash data and locks itself.

Why does the control unit 98820-1MR0A fail?

The 98820-1MR0A most often fails because of crash data stored after an accident, even if no airbag has deployed. Other causes are aged components, cold solder joints, moisture and voltage spikes.

The crash data itself cannot be erased with a normal diagnostic tool. In individual cases the following causes are also possible:

• aged electronic components
• cold solder joints
• moisture and corrosion on plug connections
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the 98820-1MR0A is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently when the 98820-1MR0A is defective. The instrument cluster displays a fault message at the same time, the diagnostic tool cannot find the control unit, and the fault memory cannot be cleared.

The light is the direct indication that the restraint system has detected a fault. Even if the vehicle otherwise seems unremarkable, it must be taken seriously.

As long as the defect persists, airbags and seatbelt pretensioners may not deploy in an emergency. Therefore have the system checked promptly.

Which vehicles is the 98820-1MR0A fitted in?

The control unit 98820-1MR0A is fitted in these vehicles: Infiniti M37 Y51 (2010-2013).

The list shows the assignment:

• Infiniti M37 Y51 (2010-2013)

Compare the part number on the label of the removed unit with this page, to make sure it is the right unit. Also have the fault memory read out beforehand, because only this finding shows whether the control unit itself is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 98820-1MA1C.

How does the repair of the 98820-1MR0A work?

You first read out the fault memory, enclose the log and disconnect the battery before removing the control unit. Afterwards create a repair order online and send the unit in well packed. Airbag24 then checks it, finds the defective components, fixes them, erases the crash data and carries out a function test.

The sequence is to be observed for safety reasons. Processing at Airbag24 usually takes 3–4 working days and comprises only checking, repairing and testing.

You then get your own unit back. 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 98820-1MR0A get to Airbag24?

You send the control unit 98820-1MR0A as a parcel or book a UPS collection 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 shockproof.