Airbag control unit with part number 1K0909605B

What does the airbag control unit 1K0909605B do?

The airbag control unit 1K0909605B coordinates the restraint system (SRS) of Volkswagen. It reads out the crash sensors, decides in an emergency whether airbags and seatbelt pretensioners fire, and monitors the system constantly. After an accident it stores crash data and locks itself; the lock is only lifted by the repair.

Diagnostics run in the background. If the unit detects a deviation, it shows it via the airbag warning light in the instrument cluster.

In everyday use the function hardly stands out. All the more important is that the electronics work reliably, because in an accident they have to react within the shortest time.

Why does the control unit 1K0909605B fail?

Stored crash data after an accident is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot erase it; Airbag24 erases it during the repair. Further causes are aged electronic components, cold solder joints, moisture at plug connections and voltage spikes.

Whether crash data is present only becomes apparent when the memory is read out, not from the unit itself.

The other causes are everyday influences: components age, solder joints can go cold, and moisture attacks contacts.

Voltage spikes, for example from a weak battery or a jump start, can also stress the electronics.

How can you tell that the 1K0909605B is defective?

A defect shows up at the airbag warning light, which lights up permanently or intermittently, and as 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 cleared.

The warning light is the signal you should not overlook.

With a fault, airbags and seatbelt pretensioners may possibly not deploy in an emergency. The cause may also lie in cables or plugs.

Which vehicles is the 1K0909605B fitted in?

The control unit 1K0909605B is fitted in these vehicles: Volkswagen Golf 5 (1K); Volkswagen Golf GTI Mk5; Volkswagen Golf Variant 5.

The list shows the vehicles recorded for this part number.

• Volkswagen Golf 5 (1K)
• Volkswagen Golf GTI Mk5
• Volkswagen Golf Variant 5

Compare the part number on the label of the removed unit with this page. This only establishes that it is the right unit. Have the fault memory read out beforehand, because only the result shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 1K0 909 605 T, 1K0909605, 1K0909605A, 1K0909605AB, 1K0909605F, 1K0909605H.

How does the repair of the 1K0909605B work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the unit well packed.

Airbag24 checks the control unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. For this work at Airbag24 3–4 working days are generally planned. Afterwards your own unit is 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 1K0909605B get to Airbag24?

For dispatch you can choose a parcel or a UPS collection, which you can book for an extra charge. After the repair Airbag24 sends the unit back by UPS.

The printed repair order is enclosed with the parcel, and the unit is packed shockproof.