Airbag control unit with part number 2K5 959 655

What does the airbag control unit 2K5 959 655 do?

The airbag control unit 2K5 959 655 is the central control unit of the restraint system (SRS) for Volkswagen. It evaluates the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

In addition, the unit monitors the entire system continuously and reports faults via the airbag warning light.

After an accident it stores crash data and locks itself.

Why does the control unit 2K5 959 655 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data stays in memory even if the airbags did not trigger, and a normal diagnostic tool cannot reach it.

The other causes concern the electronics themselves and the connections to the outside. Voltage spikes occur, for example, with a weak battery or when jump-starting. Which cause is actually present is shown only by the inspection.

How can you tell that the 2K5 959 655 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently as soon as the control unit detects a fault. In addition there are error messages in the instrument cluster, a missing connection to the diagnostic tool, and a fault memory that cannot be cleared.

A defect is therefore not hidden but shown by the warning light. Anyone who ignores the light risks that airbags and seatbelt pretensioners may possibly fail to trigger in an emergency.

Therefore have the system checked promptly while the warning light is on.

Which vehicles is the 2K5 959 655 fitted in?

The control unit 2K5 959 655 is fitted in these vehicles: Volkswagen Caddy 2K (2003-2010), 2K Facelift (2010-2015) and SA (2015-2020).

The vehicles at a glance:

• Volkswagen Caddy 2K (2003-2010)
• Volkswagen Caddy 2K Facelift (2010-2015)
• Volkswagen Caddy SA (2015-2020)

Compare the part number on the label of the removed unit with this page. The comparison only ensures that you have the right unit in front of you.

Also have the fault memory read out beforehand. Only this result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 2K5959655A, 2K5959655B, 6Q0 909 605 AJ, 6Q0909605AH, 7E0 959 655 F, 7E0959655B.

How does the repair of the 2K5 959 655 work?

Processing at Airbag24 usually takes 3–4 working days. Beforehand you have the fault memory read out, disconnect the battery and remove the control unit, then create a repair order online.

The order is binding: first the readout, then the battery, and only then the removal. Afterwards pack the unit well and send it in.

Airbag24 checks it on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards your own unit comes back 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 2K5 959 655 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 by UPS.

Enclose the printed repair order in the parcel, and pack the unit shock-proof.