Airbag control unit with part number 98820-EZ21B

What does the airbag control unit 98820-EZ21B do?

The 98820-EZ21B coordinates the restraint system (SRS) of Nissan as an airbag control unit. It checks the messages from the crash sensors, decides within milliseconds in an emergency whether to trigger airbags and seatbelt pretensioners, and monitors the system continuously.

If it detects a fault, it stores it and makes it visible. The warning appears via the airbag warning light in the instrument cluster, so the driver cannot overlook the state of the system.

After an accident, the unit stores crash data and then locks itself. This locking is an integral part of the functional logic and not a side issue.

Why does the control unit 98820-EZ21B fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other possible causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains in the memory even when the vehicle continues to drive normally after the event. A normal diagnostic tool cannot make it disappear, so a simple reset does not solve the problem.

Electronic components lose reliability over the years, and solder joints can go cold at attachment points. Water and salt attack plug connections, and voltage spikes from a weak battery or a jump start put extra strain on the electronics.

How can you tell that the 98820-EZ21B is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears alongside it. The diagnostic tool finds no connection to the control unit, and the fault memory cannot be erased.

While these signs persist, airbags and seatbelt pretensioners may not trigger in an emergency. The light is therefore a warning you should take seriously, not a detail that resolves itself.

The vehicle thereby indicates that something is wrong in the restraint system. Only reading out the fault memory reveals which component is affected.

Which vehicles is the 98820-EZ21B fitted in?

The control unit 98820-EZ21B is listed for Nissan and fitted in these vehicles: Nissan Titan H61 (2015-2020).

Here you will find the vehicles for which this part number is recorded.

• Nissan Titan H61 (2015-2020)

First compare the part number on the label of the unit with this page. That way you can see that you have the right unit in hand. Then have the fault memory read out, because only the log shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 285013989, 98820-EZ20B, 98820-EZ29B.

How does the repair of the 98820-EZ21B work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit 98820-EZ21B. Then create a repair order online and send in the well-packed unit.

At Airbag24 the unit is examined on the test bench, defective components are replaced, the stored crash data is erased and a function test is carried out. Afterwards the unit goes back to you. Processing at Airbag24 usually takes 3–4 working days.

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-EZ21B get to Airbag24?

You send the control unit 98820-EZ21B in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

The printed repair order belongs in the parcel, and the unit should be packed shockproof.