Airbag control unit with part number 98820-1MH0A

What does the airbag control unit 98820-1MH0A do?

The airbag control unit 98820-1MH0A controls the restraint system (SRS) of Infiniti. It processes the measurements of the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners fire, and checks the system continuously. After an accident it stores crash data; the unit then locks itself.

If the system detects a fault, it reports this via the airbag warning light in the instrument cluster.

Why does the control unit 98820-1MH0A fail?

Stored crash data from an accident is the most common cause, even if no airbag has deployed. Aged components, cold solder joints, moisture and corrosion at plugs, and voltage spikes in the vehicle electrical system are also possible.

The crash data remain stored in the unit until they are removed. A normal diagnostic tool can read them, but cannot erase them; Airbag24 erases them during the repair.

The other triggers lie in the electronics and their connections. Over time components age, solder joints can go cold, and moisture attacks plug connections. Voltage spikes, for example from a weak battery or a jump-start, additionally stress the circuit.

How can you tell that the 98820-1MH0A is defective?

The airbag warning light in the instrument cluster is on permanently or intermittently. Alongside it, an error message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit 98820-1MH0A, and the fault memory cannot be cleared.

The light is the most important warning sign: it shows that the system has detected a fault. Even if the vehicle drives normally in everyday use, the indication remains meaningful.

As long as the fault exists, airbags and seatbelt pretensioners may not deploy in an emergency. Therefore have the cause clarified promptly.

Which vehicles is the 98820-1MH0A fitted in?

The control unit 98820-1MH0A is fitted in these vehicles: Infiniti M37 Y51 (2010-2013).

In detail, these models are concerned:

• Infiniti M37 Y51 (2010-2013)

Compare the part number on the label of the removed unit with this page to be sure you have the correct unit. That says nothing about the cause, however. Also have the fault memory read out beforehand: only this log shows whether the control unit 98820-1MH0A is defective or whether a plug or cable is causing the problem.

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

How does the repair of the 98820-1MH0A work?

First have the fault memory of the 98820-1MH0A read out and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online. Afterwards pack the well-protected unit and send it in.

Airbag24 tests the unit on the test bench, replaces defective components and erases stored crash data. A function test follows, and then your own unit is returned. Checking, repairing and testing usually take 3–4 working days at Airbag24.

This sequence serves safety. 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 98820-1MH0A get to Airbag24?

The control unit 98820-1MH0A reaches Airbag24 either as a parcel or via a UPS collection booked for an extra charge. After the repair, Airbag24 returns it by UPS.

The printed repair order belongs in the parcel. Pack the control unit shock-resistant so that it arrives undamaged.