Airbag control unit with part number 5WK43538

What does the airbag control unit 5WK43538 do?

The airbag control unit 5WK43538 is the central control unit of the restraint system in Suzuki. It evaluates signals from the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident, it stores crash data and locks itself.

It shows detected faults via the airbag warning light. The control unit thus remains the point where the entire system comes together.

Why does the control unit 5WK43538 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot delete it. Airbag24 deletes it during the repair. Other causes in general are ageing and moisture.

The following causes also come into consideration:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 5WK43538 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, a fault message also appears in the instrument cluster, and the diagnostic tool makes no contact with the control unit. In addition, the fault memory cannot be cleared.

If you see the light come on intermittently, you already have an indication of a fault. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

Which vehicles is the 5WK43538 fitted in?

The control unit 5WK43538 is fitted in these vehicles: Suzuki Swift RZ/AZ (2017-2020), MZ/EZ Facelift (2008-2010), EA (1989-1995), AA (1983-1989), FZ/NZ (2010-2013), MZ/EZ (2005-2008), RZ/AZ Facelift (2020-2024), FZ/NZ Facelift (2013-2017), YED (from 2024) and MA (1995-2003).

The list of vehicles follows.

• Suzuki Swift RZ/AZ (2017-2020)
• Suzuki Swift MZ/EZ Facelift (2008-2010)
• Suzuki Swift EA (1989-1995)
• Suzuki Swift AA (1983-1989)
• Suzuki Swift FZ/NZ (2010-2013)
• Suzuki Swift MZ/EZ (2005-2008)
• Suzuki Swift RZ/AZ Facelift (2020-2024)
• Suzuki Swift FZ/NZ Facelift (2013-2017)
• Suzuki Swift YED (from 2024)
• Suzuki Swift MA (1995-2003)

Comparing the part number on the label of the removed unit with this page only ensures that you have the correct unit. Having the fault memory read out, by contrast, 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 38910-52R00, 38910-52RA0, 38910-52RC0, 38910-52RC1, 38910-52RC2, 38910-52RE0.

How does the repair of the 5WK43538 work?

First have the fault memory read out and enclose the log; then disconnect the battery and only then remove the control unit. Afterwards create a repair order online and send in the well-packed unit. Airbag24 checks it on the test bench, repairs defective components, deletes stored crash data and carries out a function test; processing usually takes 3–4 working days.

The order of the steps serves to protect you during removal.

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 5WK43538 get to Airbag24?

You send the unit to Airbag24 as a parcel or book a UPS collection for an extra charge; after the repair it comes back to you by UPS. Put the printed repair order into the parcel and pack the control unit shock-resistant.

Careful packing helps prevent damage to the unit.