Airbag control unit with part number 98820-4DB0B

What does the airbag control unit 98820-4DB0B do?

The airbag control unit 98820-4DB0B controls the restraint systems (SRS) for Nissan. It processes the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system without interruption.

Faults are shown via the airbag warning light. After an accident, the unit stores crash data and locks itself; this lock can only be lifted by the repair.

Why does the control unit 98820-4DB0B fail?

The most common cause is crash data from an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes are aged components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

Crash data remains stored in the unit until Airbag24 removes it.

Whether a plug, a wire or the control unit itself causes the fault can only be narrowed down by reading out the fault memory.

How can you tell that the 98820-4DB0B is defective?

A defect shows up as the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and as messages in the instrument cluster. A diagnostic tool may then be unable to connect to the control unit.

• airbag warning light on permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool finds the control unit not
• fault memory remains

In such a case, airbags and seatbelt pretensioners may possibly not trigger in an emergency.

What exactly lies behind it is shown only by reading out the fault memory.

Which vehicles is the 98820-4DB0B fitted in?

This control unit 98820-4DB0B is fitted in these vehicles: Nissan Maxima A36 (2015-2023). The information follows from the part number and not from an examination of your car.

The following details are on record for this part number:

• Nissan Maxima A36 (2015-2023)

Comparing the part number on the label of the removed unit with this page confirms that you have the right unit, but it does not clarify the cause. Only the fault memory, read out beforehand, shows whether the control unit is defective or a plug or cable is at fault.

For the same vehicles, we also repair control units with the part numbers 98820-3Y600, 98820-AV200, 98820-AV21A.

How does the repair of the 98820-4DB0B work?

First, have the fault memory read out and attach the log. Then disconnect the battery, remove the airbag control unit and, last, create the repair order online and send the unit in well packed.

At Airbag24 the unit is checked on the test bench, damaged components are replaced, crash data is deleted, and a function test follows. Processing usually takes 3–4 working days.

Your unit comes back to you afterwards. 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 98820-4DB0B get to Airbag24?

You send the unit as a parcel, or book a UPS collection for an extra charge. The return after the repair is also made by UPS.

Pack the control unit shock-proof and enclose the printed repair order.