Airbag control unit with part number 3F900-64R50

What does the airbag control unit 3F900-64R50 do?

The airbag control unit 3F900-64R50 coordinates the restraint system (SRS) in Suzuki. From the messages sent by the crash sensors, it calculates within milliseconds which airbags and seatbelt pretensioners trigger in an accident. It indicates detected faults via the airbag warning light.

During operation, the unit continuously checks the system for irregularities and stores them in memory.

After an accident, it stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 3F900-64R50 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed, and this data cannot be erased with a normal diagnostic tool. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Aged components and cold solder joints may only become noticeable once the fault has been stored in memory and recurs. Reading out the fault memory is therefore the first step.

Moisture and corrosion at plug connections can be a problem. Voltage spikes arise, for example, from a weak battery or a jump start. Airbag24 erases the stored crash data during the repair.

How can you tell that the 3F900-64R50 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears in the instrument cluster. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared.

As long as these signs persist, airbags and seatbelt pretensioners may not be able to deploy in an emergency. You should therefore have the indication checked promptly.

Which vehicles is the 3F900-64R50 fitted in?

The control unit 3F900-64R50 is fitted in these vehicles from Suzuki: Suzuki S-Cross JY.

The following vehicles are stored for this part number:

• Suzuki S-Cross JY

Compare the part number on the label of the removed unit with this page; this only confirms that you have the correct unit. Have the fault memory read out beforehand, as 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 38910-61M00, 38910-61M01, 38910-61M10, 38910-61M11, 38910-61M20, 38910-61M21.

How does the repair of the 3F900-64R50 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, and only after that remove the control unit. Then create a repair order online and send in the well-packed unit.

Airbag24 examines the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Processing usually takes 3–4 working days, after which 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 3F900-64R50 get to Airbag24?

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

Place the printed repair order in the parcel, and pack the control unit shock-proof.