Airbag control unit with part number 98820-3SW0A

What does the airbag control unit 98820-3SW0A do?

The airbag control unit 98820-3SW0A coordinates the SRS restraint system for Nissan. It processes the measurements from the crash sensors, selects the airbags and seatbelt pretensioners that should fire in an impact, and monitors all components continuously.

If the unit detects a fault, it shows it via the airbag warning light. After a collision, it also stores crash data and then remains locked.

Why does the control unit 98820-3SW0A fail?

The most common cause with the 98820-3SW0A is crash data stored after an accident, even if no airbag has fired. A normal diagnostic tool cannot erase them; other causes are aged electronics, moisture and voltage spikes.

The crash data stay in the unit until they are specifically erased. Besides that, aging electronic components can gradually give way. Cold solder joints, corrosion at plug connections and voltage spikes, such as from a weak battery or a jump-start, may also be causes.

How can you tell that the 98820-3SW0A is defective?

You recognise a defect in the 98820-3SW0A by the airbag warning light in the instrument cluster lighting up constantly or intermittently, by error messages in the instrument cluster, or by the fault memory not being erasable.

There are also these signs:

• The diagnostic tool finds no connection to the control unit.
• The warning light does not go out.
• An attempt to erase the fault memory is unsuccessful.

In an emergency, the airbags and seatbelt pretensioners may therefore not trigger. Having it checked promptly makes sense.

Which vehicles is the 98820-3SW0A fitted in?

The 98820-3SW0A is fitted in these vehicles: Nissan Sylphy B17 (from 2012).

An overview with the assignments is here:

• Nissan Sylphy B17 (from 2012)

Comparing the part number on the label of the removed unit with this page confirms that you have the right unit. That comparison does not clarify the cause. For that, the fault memory read out beforehand is needed, because it 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 28556-3RA0A, 28556-3RB0A, 28556-3RC0A, 28556-3RD0B, 28556-3RF0B, 28556-3RL0A.

How does the repair of the 98820-3SW0A work?

First the fault memory is read out with the 98820-3SW0A, then the battery is disconnected, and last the removal takes place. Processing at Airbag24 usually takes 3–4 working days.

You attach the log to the unit. Then you submit a repair order online and send the unit off. Airbag24 checks it on the test bench, repairs defective components, erases the crash data and tests the function. Then your own unit is 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 98820-3SW0A get to Airbag24?

With the 98820-3SW0A you choose between sending it as a parcel and a UPS collection, which is booked for an extra charge. The unit comes back by UPS.

Put the printed repair order into the parcel; pack the unit shock-proof.