Airbag control unit with part number 98820-3TA0C

What does the airbag control unit 98820-3TA0C do?

The airbag control unit 98820-3TA0C is the central control unit of the restraint system (SRS) of Nissan. It evaluates the signals from the crash sensors and, in a crash, determines within milliseconds which airbags and seatbelt pretensioners are triggered.

The unit monitors the system during operation and checks connections and sensor values. If it detects a fault, it reports it via the airbag warning light in the instrument cluster.

After an accident, the control unit stores crash data and then locks itself.

Why does the control unit 98820-3TA0C fail?

The most common cause is crash data stored in the unit after an accident, even without an airbag having deployed, and which cannot be erased with a normal diagnostic tool. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The unit keeps the crash data until it is erased during the repair. Airbag24 takes care of this erasure.

A control unit ages like any electronics. Solder joints that are not firmly seated can fail, and moisture or corrosion on the connectors worsens the connection. A weak battery or a jump start can also generate voltage spikes.

How can you tell that the 98820-3TA0C is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, and an error message appears there. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared.

These signs are clear indications of a defect, which the warning light displays. In an emergency, the airbags and seatbelt pretensioners may not deploy, so the cause should be clarified promptly.

Which vehicles is the 98820-3TA0C fitted in?

The control unit 98820-3TA0C is fitted in these Nissan vehicles: Nissan Altima L33 (2012-2018). The part number on the unit lets you check the match with your own car.

The list shows vehicles in which this control unit occurs.

• Nissan Altima L33 (2012-2018)

Compare the part number on the label of the removed unit with this page. That only confirms that you have the correct unit. Have the fault memory read out before removal, because only that result shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 98820-3TA0B, 98820-3TA9C, 98820-9HN0A, 98820-9HS9A.

How does the repair of the 98820-3TA0C work?

Have the fault memory read out and put the log into the parcel. Disconnect the battery before removing the control unit. Create the repair order online and send in the unit well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and repairs defective components. The stored crash data is then erased, and a function test follows. Your own unit is then returned.

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 98820-3TA0C get to Airbag24?

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

Put the printed repair order into the parcel and pack the control unit shock-resistant.