Airbag control unit with part number 3F900-86R10

What does the airbag control unit 3F900-86R10 do?

The airbag control unit 3F900-86R10 coordinates the restraint system in Suzuki vehicles. It evaluates the signals from the sensors, decides in an impact on airbags and seatbelt pretensioners, and monitors the system during operation.

The control unit shows faults via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself.

Why does the control unit 3F900-86R10 fail?

The most common reason for a fault in the 3F900-86R10 is crash data from an accident, even if no airbag has fired. A diagnostic tool with standard functions does not delete this data. Other possible causes are aged electronics, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, such as those that occur with a weak battery or jump-starting.

The crash data remains in the unit until it is specifically deleted.

Solder joints can be cold, water and salt attack plug connections, and voltage spikes stress the components additionally.

How can you tell that the 3F900-86R10 is defective?

Several signs point to a fault in the 3F900-86R10. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

Watch for these signs:

• The airbag warning light in the instrument cluster stays on permanently or intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool gets no connection to the control unit.
• The fault memory cannot be cleared.

The light is therefore a signal you should take seriously.

Which vehicles is the 3F900-86R10 fitted in?

The control unit 3F900-86R10 is fitted in these vehicles: Suzuki Vitara LY and S. The assignment concerns Suzuki.

The assignment lists these vehicles:

• Suzuki Vitara LY
• Suzuki Vitara S

Compare the part number on the label with this page. That only confirms the unit fits. Have the fault memory read out before removal, because only the log 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 16244579, 38910-54P00, 3891052D10, 3891065J50, 3891086R00, 3F900-76S00.

How does the repair of the 3F900-86R10 work?

Before removal, have the fault memory of the 3F900-86R10 read out and attach the log, then disconnect the battery and only then remove the control unit. After that create a repair order online and send the unit in, well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, renews defective components, deletes the crash data and carries out a function test. The unit then goes back to you.

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 3F900-86R10 get to Airbag24?

You send the control unit 3F900-86R10 in as a parcel, or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

Include the printed repair order and pack the unit shock-proof.