Airbag control unit with part number 5WK42926

What does the airbag control unit 5WK42926 do?

The control unit 5WK42926 is the airbag control unit for the restraint system of Opel. It checks the crash sensors, calculates the triggering within milliseconds in the event of an impact and monitors the entire system. It signals faults via the airbag warning light.

During driving, monitoring continues, and the unit remembers deviations.

After an accident it stores crash data and locks itself.

Why does the control unit 5WK42926 fail?

Most common cause with the 5WK42926: crash data stored after an accident, even if no airbag has fired, and a normal diagnostic tool cannot erase it. Aged components, cold solder joints, moisture and corrosion at plug connections, and voltage peaks are also possible.

Crash data is created during the accident as soon as the unit registers it, regardless of whether an airbag has triggered.

Aged components, cold solder joints and moisture affect the connections, while voltage peaks, for example from a jump start, affect the electronics.

How can you tell that the 5WK42926 is defective?

An airbag warning light that stays on permanently or only intermittently on the 5WK42926 is the first sign, together with an error message in the instrument cluster. In addition the diagnostic tool finds no connection to the control unit and the fault memory cannot be erased. Airbags and seatbelt pretensioners may then not be able to deploy in an emergency.

The warning light shows the defect, and this also applies when driving normally.

Note the message and the behaviour of the light, so that you can match the later diagnostic result to it.

Which vehicles is the 5WK42926 fitted in?

You will find the control unit 5WK42926 in these vehicles: Opel Zafira A (1999-2005).

Here is the list of vehicles for comparison:

• Opel Zafira A (1999-2005)

You compare the part number on the label of the removed unit using this page; that only clarifies whether it is the correct unit. Reading out the fault memory before removal, on the other hand, 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 09 229 303, 09 229 303 BG, 09229302, 13261676, 24416703, 24416704DM.

How does the repair of the 5WK42926 work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit. Create the repair order online, and send in the well-packed 5WK42926. Airbag24 usually processes the unit in 3–4 working days.

Airbag24 examines the control unit on the test bench, replaces defective components and deletes stored crash data, followed by the function test. You get your own unit back.

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 5WK42926 get to Airbag24?

The 5WK42926 reaches Airbag24 by parcel or by a UPS collection that is booked for an extra charge. After the repair it is returned by UPS.

Pack the printed repair order along with it and pack the control unit shock-proof.