Airbag control unit with part number 3F900-80T10

What does the airbag control unit 3F900-80T10 do?

The control unit 3F900-80T10 is the airbag control unit of the restraint system in the Suzuki. It evaluates the signals from the crash sensors, decides within milliseconds in an accident whether the airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

It shows detected faults via the airbag warning light. If an accident occurs, it creates crash data and locks itself.

Why does the control unit 3F900-80T10 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes also come into consideration.

Crash data belongs to the entries that cannot be removed by the usual means.

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a jump start

How can you tell that the 3F900-80T10 is defective?

A defect shows up through certain signs in the instrument cluster and on the diagnostic tool. In a critical situation, the airbags and seatbelt pretensioners may then not be able to deploy.

The signs at a glance:

• Airbag warning light lights up constantly or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

Which vehicles is the 3F900-80T10 fitted in?

The control unit 3F900-80T10 is fitted in these vehicles: Suzuki Swift RZ/AZ (2017-2020) and RZ/AZ Facelift (2020-2024).

The list shows the models on record for this part number.

• Suzuki Swift RZ/AZ (2017-2020)
• Suzuki Swift RZ/AZ Facelift (2020-2024)

Compare the part number on the label of the removed unit with this page to confirm that it is the correct unit. Reading out the fault memory before removal also helps, because it shows whether the control unit or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 38910-62J12-000, 38SC001R9RH.

How does the repair of the 3F900-80T10 work?

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; send the well-packed unit in. Checking, repairing and testing usually takes 3–4 working days at Airbag24.

The sequence protects the work on the system. That is why the control unit is only removed after the battery has been disconnected.

At Airbag24 the unit is checked, defective components are replaced, the crash data is erased, and a function test is carried out. Afterwards you receive your own unit 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 3F900-80T10 get to Airbag24?

Sending the control unit 3F900-80T10 as a parcel or booking a UPS collection for an extra charge brings it to Airbag24. The return after the repair is made by UPS.

The printed repair order belongs in the parcel, and the unit is packed shockproof.