Airbag control unit with part number 1T0909605B

What does the airbag control unit 1T0909605B do?

The 1T0909605B is the evaluation unit of the restraint system (SRS) of Volkswagen. It receives the messages from the crash sensors, determines within milliseconds which airbags and seatbelt pretensioners to trigger, and checks the system continuously. After an accident, it stores crash data and locks itself.

Its tasks also include diagnostics: faults are detected, stored and shown via the airbag warning light in the instrument cluster.

Because the decision allows no delay in an emergency, the unit works continuously in the background.

Why does the control unit 1T0909605B fail?

The most common cause in the 1T0909605B is stored crash data after an accident, even if no airbag was deployed; a normal diagnostic tool cannot erase it. Added to this are aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes, for example from a weak battery or after a jump start.

The record of the accident remains in the unit's memory even if the vehicle is then used normally.

The other causes arise over time or from environmental influences. Electronics age, solder joints can go cold, and moisture and corrosion attack the contacts.

Voltage spikes act briefly but strongly on the circuitry. A weak battery or a jump start can trigger them.

How can you tell that the 1T0909605B is defective?

The airbag warning light in the instrument cluster shows the fault in the 1T0909605B by lighting up permanently or intermittently. Also present may be an error message in the instrument cluster, no connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared. Then airbags and seatbelt pretensioners may possibly fail to trigger in an emergency.

That the light comes on is the message of the system itself, not a hint from outside. Taking this message seriously is therefore the right step.

Which vehicles is the 1T0909605B fitted in?

The control unit 1T0909605B is fitted in these vehicles: Volkswagen Touran 1T (GP2) (2010-2015), 1T (2003-2006) and 1T (GP) (2006-2010). Only the part number is reliable here, less so the vehicle designation.

Below you will find the vehicles recorded for this part number.

• Volkswagen Touran 1T (GP2) (2010-2015)
• Volkswagen Touran 1T (2003-2006)
• Volkswagen Touran 1T (GP) (2006-2010)

Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit. Whether the control unit is defective or a plug or cable is the cause only becomes clear once the fault memory has been read out, which you should therefore have done beforehand.

For the same vehicles, we also repair control units with the part numbers 1T0 909 605 E, 1T0909605C, 1T0909605D, 1T0909605D01E, 5WK43518.

How does the repair of the 1T0909605B work?

First have the fault memory read out and enclose the log. Then disconnect the battery, and only then remove the control unit 1T0909605B. Finally, create a repair order online and send in the well-packed unit.

This order serves safety. At Airbag24, the unit is examined on the test bench, defective components are repaired, stored crash data is erased and a functional test is carried out. These steps usually take 3–4 working days.

Afterwards you receive 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 1T0909605B get to Airbag24?

You either send the 1T0909605B as a parcel or have it collected by UPS for an extra charge. After the repair, the unit goes back to you by UPS.

Put the printed repair order into the package, and pack the unit to withstand shocks.