Airbag control unit with part number 98820-3TT0A

What does the airbag control unit 98820-3TT0A do?

The airbag control unit 98820-3TT0A controls the restraint system (SRS) of Nissan. It evaluates the signals from the crash sensors, decides in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system. It indicates faults via the airbag warning light.

The evaluation takes place in fractions of a second, so that the decision is made in time. The unit also keeps an eye on the condition of the connected components.

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

Why does the control unit 98820-3TT0A fail?

Stored crash data from an accident are the most common cause with the control unit 98820-3TT0A, even if no airbag has deployed; a normal diagnostic tool cannot delete them. Aged electronics, cold solder joints, moisture at plug connectors and voltage spikes can also be involved.

With an ordinary diagnostic tool this memory content cannot be removed, even though the electronics otherwise work.

The other causes relate to ageing, solder joints and plug connections. Voltage spikes, as occur with a weak battery or jump-starting, also belong to them.

How can you tell that the 98820-3TT0A is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently if the 98820-3TT0A has a fault. Fault messages, a missing connection to the diagnostic tool or a fault memory that cannot be cleared may also appear. Then airbags and seatbelt pretensioners may not trigger in an emergency.

The airbag warning light in the instrument cluster indicates a fault in the restraint system, even when the vehicle drives normally in everyday use.

A missing connection to the diagnostic tool is a further warning sign, but it need not lie in the control unit. A fault memory that cannot be cleared confirms that an entry exists and shows its type.

Which vehicles is the 98820-3TT0A fitted in?

The airbag control unit 98820-3TT0A is fitted in these vehicles: Nissan Teana L33 (2013-2020).

The following list shows the vehicles for this part number:

• Nissan Teana L33 (2013-2020)

Comparing the part number on the label with this page is possible; it confirms that you have the right unit. Reading out the fault memory is the next step, because only it shows whether the control unit is defective or whether a plug or a cable is causing the fault.

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

How does the repair of the 98820-3TT0A work?

First have the fault memory read out and the log attached, then disconnect the battery and only then remove the control unit 98820-3TT0A. Create the repair order online, and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit, replaces defective components, deletes stored crash data and carries out a function test. Your own unit then 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 98820-3TT0A get to Airbag24?

You send the control unit 98820-3TT0A off as a parcel or book a UPS collection for an extra charge. After the repair, UPS returns it from Airbag24. Pack it shock-resistant and enclose the printed repair order.

A sturdy box with padding protects the unit on the way. The repair order in the parcel helps with matching.