Airbag control unit with part number 98820-3TN0B

What does the airbag control unit 98820-3TN0B do?

The airbag control unit 98820-3TN0B is the control unit of the restraint system (SRS) of Nissan. It receives the messages from the crash sensors and triggers the appropriate airbags and seatbelt pretensioners in an accident, within fractions of a second. It also monitors all components continuously.

If a fault occurs, the unit writes it to the fault memory and shows it via the airbag warning light in the instrument cluster.

If an accident occurs, the unit stores crash data and locks itself.

Why does the control unit 98820-3TN0B fail?

Stored crash data from an earlier accident is the most common cause, even if no airbag triggered during that event. A normal diagnostic tool cannot remove this data. Other causes are aged components, cold solder joints, moisture and corrosion at the plug connections, and voltage spikes, for example from a weak battery or jump-starting. Airbag24 erases the crash data during the repair.

The entries remain in the unit until the repair removes them.

Electronics age, solder joints can stay cold or become brittle, and moisture changes contacts over time.

How can you tell that the 98820-3TN0B is defective?

A fault can show itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Also possible are a fault message in the instrument cluster, a diagnostic tool without connection to the control unit, or a fault memory that cannot be erased. Then airbags and seatbelt pretensioners may not trigger in an emergency.

The display in the instrument cluster is the first warning signal you will notice. Pay attention to it after switching on the ignition.

How serious the situation is becomes clear only from reading out the fault memory.

Which vehicles is the 98820-3TN0B fitted in?

The airbag control unit 98820-3TN0B is fitted in these vehicles: Nissan Teana L33 (2013-2020).

The list names the vehicles recorded for this number.

• Nissan Teana L33 (2013-2020)

Matching the part number on the label of the removed unit with this page only confirms that you have the correct unit. Also have the fault memory read out beforehand, because only the result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 98820-3TN0A.

How does the repair of the 98820-3TN0B work?

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

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

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 98820-3TN0B get to Airbag24?

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

Put the printed repair order into the parcel and pack the unit so that it is shock-resistant.