Airbag control unit with part number 3D0909601B

What does the airbag control unit 3D0909601B do?

As a central unit, the airbag control unit 3D0909601B controls the restraint system (SRS) of Volkswagen. It reads the crash sensors, decides within milliseconds in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system permanently.

The unit reports faults via the airbag warning light in the instrument cluster. After a crash, it stores crash data and locks itself.

The manufacturer number Bosch 0285001472 is also printed on the housing.

Why does the control unit 3D0909601B fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. This data cannot be deleted with a normal diagnostic tool. Other possible causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Whether any of these causes applies is only established by reading the fault memory. A plug or a cable can cause similar warnings to the unit itself.

Voltage spikes occur, for example, with a weak battery or when jump-starting, so it is also worth taking a look at the battery.

How can you tell that the 3D0909601B is defective?

A defect shows on the airbag warning light in the instrument cluster, which stays on permanently or intermittently, and on an error message in the instrument cluster. In addition, there is no connection to the diagnostic tool, or the fault memory cannot be cleared.

If the restraint system is faulty, airbags and seatbelt pretensioners may not trigger in an emergency. The light is the vehicle's warning, and it must not be ignored.

Which vehicles is the 3D0909601B fitted in?

This page shows the vehicles for which this number is stored with us. The 3D0909601B is fitted in these vehicles: Volkswagen Touareg 7L Facelift (2006-2010) and 7L (2002-2006).

The vehicles are listed below.

• Volkswagen Touareg 7L Facelift (2006-2010)
• Volkswagen Touareg 7L (2002-2006)

Compare the part number on the label of the removed unit with this page to make sure it is the right unit. Also have the fault memory read out, because only the log 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 0 285 001 733, 3D0 909 601 D, 3D0 909 601 E, 3D0909601F, 7L0959655, 7L0959655A.

How does the repair of the 3D0909601B work?

First have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the control unit. Create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, repairs defective components, deletes stored crash data and carries out a function test. At Airbag24, processing usually takes 3–4 working days, after which 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 3D0909601B get to Airbag24?

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

Put the printed repair order into the parcel and pack the unit shockproof.