Airbag control unit with part number 98820-1MF1A

What does the airbag control unit 98820-1MF1A do?

The airbag control unit 98820-1MF1A is the central control unit of the restraint system (SRS) of Infiniti. It evaluates the signals from the crash sensors, decides in the event of an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

The unit registers faults in the system and shows them via the airbag warning light in the instrument cluster. This means the state of the system in the vehicle can be checked at any time.

The lock after an accident applies until the repair ends it.

Why does the control unit 98820-1MF1A fail?

Stored crash data after an accident is the most common cause, even if no airbag was deployed; it cannot be erased with a normal diagnostic tool. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Stored crash data remains in the unit even if the vehicle is then used without any irregularities. Airbag24 erases it during the repair.

The remaining causes mainly concern electronics and the power supply. Aged components lose reliability, cold solder joints can come loose, and moisture attacks the plug connections. Voltage spikes, for example from a weak battery or a jump start, put additional strain on the circuits.

How can you tell that the 98820-1MF1A is defective?

A defect shows up on the airbag warning light in the instrument cluster, which lights up permanently or intermittently, through fault messages in the instrument cluster, through a missing connection to the diagnostic tool, and through a fault memory that cannot be cleared.

As soon as one of these signs appears, airbags and seatbelt pretensioners may not deploy in an emergency. The warning light indicates the defect, so have the system checked promptly.

Which vehicles is the 98820-1MF1A fitted in?

The control unit 98820-1MF1A is fitted in these vehicles: Infiniti M37 Y51 (2010-2013).

This assignment lists the vehicles:

• Infiniti M37 Y51 (2010-2013)

Compare the part number on the label of the removed unit with this page; this only confirms that it is the correct unit. Have the fault memory read out beforehand, because only this 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 98820-1MA1C.

How does the repair of the 98820-1MF1A work?

You read out the fault memory first, then disconnect the battery and only then remove the control unit. Next you create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. The unit is then sent back to you.

Airbag24 normally needs 3–4 working days for processing. This time covers only the checking, repairing and testing.

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 98820-1MF1A get to Airbag24?

You send a parcel to Airbag24, or you book a UPS collection for an extra charge. The return of the repaired control unit 98820-1MF1A is made by UPS.

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