Airbag control unit with part number 98820-1MB0A

What does the airbag control unit 98820-1MB0A do?

The 98820-1MB0A is an airbag control unit and coordinates the restraint system (SRS) of Infiniti. Using the crash sensors, it decides within milliseconds which airbags and seatbelt pretensioners are triggered, and it monitors the system continuously.

If the system detects a fault, it appears on the airbag warning light in the instrument cluster. This is how the driver learns of faults in the restraint system.

After an accident, the unit stores crash data and locks itself. This state relates to the control unit itself.

Why does the control unit 98820-1MB0A fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Besides that, ageing, moisture and voltage spikes come into question as triggers.

• Ageing electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or a jump start

Crash data cannot be erased with a normal diagnostic tool. It remains in memory, even if the vehicle shows no external damage.

The causes listed here relate to wear and environmental influences, and the inspection takes exactly these into account.

How can you tell that the 98820-1MB0A is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. A fault message also appears in the instrument cluster, the diagnostic tool has no connection to the control unit, and the fault memory cannot be erased.

In this case, airbags and seatbelt pretensioners may not trigger in an emergency, and that is exactly why the warning deserves attention.

Whether the control unit itself is affected can be found out by reading out the fault memory.

Which vehicles is the 98820-1MB0A fitted in?

In these vehicles from Infiniti, the 98820-1MB0A is installed: Infiniti M37 Y51 (2010-2013).

Below are the vehicles that are recorded for this part number.

• Infiniti M37 Y51 (2010-2013)

Compare the part number on the label with this page, and you will know whether it is the right unit. The real clarification comes from the fault memory, which you have read out before removal, because it shows whether the control unit is defective or a line is behind it.

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

How does the repair of the 98820-1MB0A work?

First, have the fault memory read out and enclose the log. Then disconnect the battery and remove the control unit 98820-1MB0A. Next, create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 examines the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Afterwards the unit goes back to you. This period refers only to testing, repairing and checking.

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 98820-1MB0A get to Airbag24?

You send the unit in as a parcel, or you book a UPS collection for an extra charge, and Airbag24 sends it back to you by UPS after the repair.

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