Airbag control unit with part number 6Q0909605AD

What does the airbag control unit 6Q0909605AD do?

The airbag control unit 6Q0909605AD is the central control unit of the restraint system (SRS) of Seat. It evaluates the signals from the crash sensors and decides within a few milliseconds in an accident which airbags and seatbelt pretensioners trigger.

It also monitors the entire system continuously. If it detects a fault, it reports this via the airbag warning light in the instrument cluster. The check therefore does not only happen in an emergency, but throughout the operation of the vehicle.

After an accident, the control unit stores crash data and locks itself.

Why does the control unit 6Q0909605AD fail?

The most common cause with 6Q0909605AD is stored crash data after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Aged electronic components, cold solder joints, moisture and corrosion in plug connections, and voltage spikes from a weak battery or jump-starting are also possible.

This data stays in the unit until it is erased during the repair. Airbag24 erases the crash data in a targeted way, so that the other causes can be checked separately.

The other causes concern the electronics themselves and their connections. Solder joints and contacts change over the years, and moisture or salt attack the connections. Voltage spikes arise when the battery weakens or when jump-starting is carried out via cables.

How can you tell that the 6Q0909605AD is defective?

A defect in the 6Q0909605AD shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, through a fault message in the instrument cluster, through a missing connection to the diagnostic tool, or through a fault memory that cannot be cleared. In this case, airbags and seatbelt pretensioners may fail to deploy in an emergency.

The signs do not always all appear at the same time. A single one of them is enough to have the fault memory read out:

• Airbag warning light lights up permanently or intermittently
• Fault message in the instrument cluster
• no connection between diagnostic tool and control unit
• fault memory cannot be cleared

Do not wait for the check until the light burns constantly. The warning light shows the finding, so you do not have to wait for the condition to worsen.

Which vehicles is the 6Q0909605AD fitted in?

The 6Q0909605AD is fitted in these vehicles: Seat Ibiza 3 [6L] (2002-2006) and 3 [6L] Facelift (2006-2008); Seat Cordoba 2 [6L] (2002-2008).

The vehicles in which this part number is recorded are listed here:

• Seat Ibiza 3 [6L] (2002-2006)
• Seat Ibiza 3 [6L] Facelift (2006-2008)
• Seat Cordoba 2 [6L] (2002-2008)

Compare the part number on the label of the removed unit with this page. This only establishes that it is the correct unit. Whether the control unit is defective, or whether a plug or a cable is the cause, is shown only by the fault memory, which you have read out before removal.

For the same vehicles, we also repair control units with the part numbers 5WK42800, 6Q0 909 605S, 6Q0909605AE.

How does the repair of the 6Q0909605AD work?

In the repair of the 6Q0909605AD, you first have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit. Next, you create a repair order online and send the unit in well packed. Airbag24 checks it, replaces defective components, erases crash data and carries out a function test.

The order of the first steps serves safety, so please keep to it exactly.

Processing at Airbag24 usually takes 3–4 working days. This time applies to checking, repairing and testing in our workshop.

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 6Q0909605AD get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the control unit back to you by UPS.

Pack the printed repair order into the parcel and pack the control unit shock-proof, so that it survives transport undamaged.