Airbag control unit with part number 3F900-58T00

What does the airbag control unit 3F900-58T00 do?

The airbag control unit 3F900-58T00 controls the restraint system (SRS) for Suzuki. It processes the signals from the crash sensors, decides in the event of an accident whether airbags and seatbelt pretensioners are triggered, and checks the system continuously.

Faults are shown via the airbag warning light, which is located in the instrument cluster.

After an accident the unit stores crash data and locks itself. This process is built into the design.

Why does the control unit 3F900-58T00 fail?

Stored crash data is the most common cause of a fault in the 3F900-58T00, even if no airbag was deployed. A normal diagnostic tool cannot remove it. Other causes include aged components, cold solder joints, moisture, corrosion and voltage spikes.

The term "erasable" means that Airbag24 removes the data during the repair.

Aged components and cold solder joints disrupt the function of the electronics. Moisture and corrosion at plug connections, as well as voltage spikes caused by a weak battery or a jump start, can also be a cause.

How can you tell that the 3F900-58T00 is defective?

You can recognise a defect in the 3F900-58T00 by the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Further signs are an error message and a failed connection to the diagnostic tool.

• Airbag warning light in the instrument cluster lights up permanently or intermittently
• Error message in the instrument cluster
• No connection between the diagnostic tool and the control unit
• Fault memory cannot be cleared

While the control unit is faulty, airbags and seatbelt pretensioners may not trigger in an emergency. Please have the warning checked promptly.

Which vehicles is the 3F900-58T00 fitted in?

The control unit 3F900-58T00 is fitted in these vehicles: Suzuki Swift RZ/AZ (2017-2020) and RZ/AZ Facelift (2020-2024).

The vehicles in detail:

• 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 make sure you have the right unit. Before you remove it, have the fault memory read out. Only this log shows whether the control unit is defective or whether a plug or cable is behind the fault.

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

How does the repair of the 3F900-58T00 work?

First have the fault memory read out and include the log. Then disconnect the battery and only then remove the control unit 3F900-58T00. Next, create a repair order online and pack the unit carefully. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the control unit is examined on the test bench, defective components are repaired and the crash data is deleted. Finally a function test is carried out, after which your unit is sent 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 3F900-58T00 get to Airbag24?

You send the control unit 3F900-58T00 as a parcel to us, or you book a UPS collection for an extra charge. UPS handles the return after the repair.

The unit must be packed shockproof, and the printed repair order goes with it.