Airbag control unit with part number 38910-57L40

What does the airbag control unit 38910-57L40 do?

The 38910-57L40 is the airbag control unit of the restraint system (SRS) of Suzuki. It processes the signals from the crash sensors, selects the airbags and seatbelt pretensioners to deploy in a crash within milliseconds, and monitors the system continuously.

It stores any faults it detects and reports them via the airbag warning light in the instrument cluster. This makes a fault visible before it becomes a problem in an emergency.

After an accident, the unit records crash data and locks itself. The lock is only lifted by a repair.

Why does the control unit 38910-57L40 fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other possible causes include aged components, cold solder joints, moisture at plug connections and voltage spikes.

Crash data remains stored even if the car then drives normally. An ordinary reader cannot remove it.

The other causes affect the electronics over time. Ageing components, poor solder joints, moisture at the connectors and voltage spikes can all trigger faults.

How can you tell that the 38910-57L40 is defective?

A fault shows up as the airbag warning light lighting up permanently or intermittently, as an error message in the instrument cluster, as a lost connection to the diagnostic tool, and as a fault memory that cannot be cleared.

• Airbag warning light lit in the instrument cluster
• Error message in the instrument cluster
• Diagnostic tool finds no connection to the control unit
• Fault memory cannot be cleared

With these signs, the airbags and seatbelt pretensioners may not deploy in an emergency.

If the system shows a fault, have it checked rather than waiting.

Which vehicles is the 38910-57L40 fitted in?

The 38910-57L40 is fitted in these vehicles: Suzuki Kizashi RE91S.

The part number is on record for these vehicles:

• Suzuki Kizashi RE91S

Compare the part number on the label of the removed unit with this page to make sure it is the right unit. Have the fault memory read out beforehand, as only this 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 38910-57L00, 395057L105, 4815057L01.

How does the repair of the 38910-57L40 work?

First have the fault memory read out and enclose the log. Then disconnect the battery. Only then remove the control unit and create a repair order online. Pack the unit well and send it in. Processing at Airbag24 usually takes 3–4 working days.

Keep to this order, as the control unit may only be removed after the battery has been disconnected. Enclose the log with the unit.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored 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 38910-57L40 get to Airbag24?

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

The printed repair order goes in the parcel, and the unit is packed shockproof.