Airbag control unit with part number 38910-54T40

What does the airbag control unit 38910-54T40 do?

The airbag control unit 38910-54T40 is the central control unit of the restraint system (SRS) of Suzuki. It processes the signals from the crash sensors, determines the triggering of airbags and seatbelt pretensioners within milliseconds in an accident, and monitors the system continuously.

Faults are reported via the airbag warning light in the instrument cluster. This indication is the sign that something in the restraint system should be checked.

After an accident the unit stores crash data and locks itself. The sensors deliver their values to the control unit, which works in the background.

Why does the control unit 38910-54T40 fail?

Most often the cause is crash data stored after an accident, even when no airbag has deployed. Added to this are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery.

Crash data cannot be erased with a normal diagnostic tool and therefore stays in the unit. This explains why a fault persists even when the vehicle looks unremarkable from the outside.

The other causes concern the electronics and the connections. Which of them applies in an individual case only becomes clear through the inspection.

How can you tell that the 38910-54T40 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently. A fault message also appears in the instrument cluster, the diagnostic tool cannot find the control unit, and the fault memory cannot be cleared. With these signs, airbags and seatbelt pretensioners may not deploy in an emergency.

The light indicates a detected fault, however long it stays on. An inspection is therefore advisable.

Only the readout of the fault memory shows whether the control unit itself is affected. A missing connection can also have other causes.

Which vehicles is the 38910-54T40 fitted in?

The control unit 38910-54T40 is fitted in these vehicles: Suzuki Swift RZ/AZ (2017-2020) and RZ/AZ Facelift (2020-2024).

The models that our data holds for this control unit are compiled here.

• 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. This only shows that it is the correct unit. Also have the fault memory read out before removal, because only this 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 38910-62J12-000, 38SC001R9RH.

How does the repair of the 38910-54T40 work?

At Airbag24, testing, repairing and checking usually take 3–4 working days. Beforehand, have the fault memory read out, attach the log and disconnect the battery before the control unit is removed. Then create a repair order online and send in the well-packed unit.

The order matters for safety and is binding. The control unit may only be removed once the battery has been disconnected.

Airbag24 examines the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Afterwards your own unit is returned 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 38910-54T40 get to Airbag24?

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

Put the printed repair order into the parcel and pack the unit shockproof.