Airbag control unit with part number 98820-3YU0B

What does the airbag control unit 98820-3YU0B do?

The airbag control unit 98820-3YU0B is the control unit of the restraint system (SRS) in vehicles from Nissan. In an accident it processes the crash sensors and triggers the appropriate airbags and seatbelt pretensioners within milliseconds. During normal operation it checks the system continuously and reports faults via the airbag warning light.

This monitoring runs unobtrusively in the background, checking supply, wiring and sensors.

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

Why does the control unit 98820-3YU0B fail?

The most common cause is stored crash data, even if no airbag triggered during the event; an ordinary diagnostic tool cannot erase it. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible. Airbag24 erases the crash data during repair.

Crash data is an entry that the unit creates itself. The entry remains until it is removed during repair.

Aged components and brittle solder joints cause faults that only gradually become noticeable.

Moisture and corrosion at plug connections alter the contacts. Voltage spikes occur, for example, with a weak battery or jump-starting.

How can you tell that the 98820-3YU0B is defective?

A defect shows itself through several signs that the vehicle itself reports. In an emergency, airbags and seatbelt pretensioners may fail to trigger if the control unit is defective.

• Airbag warning light in the instrument cluster is on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

The warning light is the system's direct display and deserves attention, even if the vehicle otherwise drives normally.

Which vehicles is the 98820-3YU0B fitted in?

The airbag control unit 98820-3YU0B is fitted in these vehicles: Nissan Sylphy B17 (from 2012).

The list names the vehicles recorded for this number.

• Nissan Sylphy B17 (from 2012)

Matching the part number on the label with this page ensures that you have the right 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 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 98820-3YU0B work?

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

Airbag24 examines the unit on the test bench and replaces defective components. Afterwards the stored crash data is erased and a function test is carried out before your own unit goes back.

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 98820-3YU0B get to Airbag24?

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

The printed repair order goes into the parcel, and the unit must be packed shockproof.