Airbag control unit with part number 38910-61M21

What does the airbag control unit 38910-61M21 do?

The airbag control unit 38910-61M21 coordinates the restraint system (SRS) for Suzuki. It checks the signals from the crash sensors, decides within milliseconds in the event of an impact whether to deploy airbags and seatbelt pretensioners, and monitors the system at all times. After an accident it stores crash data and locks itself, and it reports faults via the airbag warning light.

The evaluation of the sensors continues in the background. The unit compares the measured values with stored criteria and so distinguishes whether an impact requires deployment.

The connection to the ignition circuits and the seatbelt pretensioners is also monitored. If the control unit detects a deviation, it creates a fault entry that the diagnostic tool reads out later.

Why does the control unit 38910-61M21 fail?

Stored crash data is the most common cause with the 38910-61M21, even if no airbag was deployed in the accident. A standard diagnostic tool cannot erase it. Other causes include ageing components, cold solder joints, moisture on connectors and voltage spikes.

An accident leaves crash data in the control unit, even if the airbags do not fire. These entries remain and cannot be removed with a normal diagnostic tool. At Airbag24 they are deleted during the repair.

Other causes include ageing electronic components and cold solder joints on the circuit board. Moisture and corrosion at plug connections can also cause faults, as can voltage spikes, for example from a weak battery or a jump start.

How can you tell that the 38910-61M21 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently on the 38910-61M21. Add to that an error message, a missing connection to the diagnostic tool and a fault memory that cannot be cleared.

The warning light may be the driver's only indication. It should be taken seriously even if the car drives normally.

As long as the system is faulty, airbags and seatbelt pretensioners may not deploy in an emergency. The cause should therefore be clarified promptly.

Which vehicles is the 38910-61M21 fitted in?

The 38910-61M21 is fitted in these vehicles: Suzuki SX4 S-Cross; Suzuki S-Cross JY.

The list shows the vehicles in which this control unit was fitted.

• Suzuki SX4 S-Cross
• Suzuki S-Cross JY

Before you remove anything, compare the part number on the unit with the information given here. A previously read fault memory shows whether the control unit itself is affected or whether a cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 38910-54L00, 38910-61M01, 38910-61M50, 38910-64R00, 38910-80J40, 5WK43636C.

How does the repair of the 38910-61M21 work?

You read out the fault memory, enclose the log, disconnect the battery and remove the control unit. Then you create the repair order online and send the control unit in packaging. At Airbag24, checking, repairing and testing take 3–4 working days as a rule.

Airbag24 replaces defective components on the test bench, deletes the crash data and carries out a function test.

Your own unit is then 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 38910-61M21 get to Airbag24?

You send the control unit 38910-61M21 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit so that it is shock-resistant.