Airbag control unit with part number 2Q0 959 655 AT

What does the airbag control unit 2Q0 959 655 AT do?

The airbag control unit 2Q0 959 655 AT controls the restraint system (SRS) in the Audi vehicle. It records the signals from the crash sensors and, in an impact, determines which airbags and seatbelt pretensioners are triggered.

The unit makes this decision within milliseconds. It also monitors the entire restraint system continuously and indicates faults via the airbag warning light. After an accident, it stores crash data and is locked afterwards.

Why does the control unit 2Q0 959 655 AT fail?

The most common cause at control unit 2Q0 959 655 AT is crash data stored after an accident, even without an airbag having deployed. A normal diagnostic tool cannot erase this data. In addition, there are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is created even when an accident does not trigger the airbags. It stays in the unit and leads to a fault in the system, even if the electronics are otherwise intact.

Electronic components are subject to ageing and lose performance over time. Cold solder joints can come loose through temperature changes, and moisture or corrosion at the plugs interrupts connections. Voltage spikes arise, for example, with a weak battery or when jump-starting.

How can you tell that the 2Q0 959 655 AT is defective?

A defect at control unit 2Q0 959 655 AT is recognisable from the airbag warning light in the instrument cluster, which stays on permanently or intermittently. Typical signs are also an error message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be erased.

• Airbag warning light, permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be erased

With these signs, airbags and seatbelt pretensioners may not be able to trigger in an emergency. The warning light indicates the defect, so a prompt check is the right step.

Which vehicles is the 2Q0 959 655 AT fitted in?

The control unit 2Q0 959 655 AT is fitted in these vehicles: Audi A1 GB (from 2018).

These vehicles are known to us for this part number:

• Audi A1 GB (from 2018)

Check the part number on the label of the unit and compare it with this page. This ensures that it is the right unit. You should also have the fault memory read out, because it shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 2Q0 959 655 AK, 2Q0959655AC.

How does the repair of the 2Q0 959 655 AT work?

Processing at Airbag24 usually takes 3–4 working days. Beforehand, the fault memory is read out, the log is enclosed, the battery is disconnected and the control unit is then removed. Afterwards, you create a repair order online and send the unit in.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and carries out a function test. After that, you receive your own unit back. The 3–4 working days only cover checking, repairing and testing at Airbag24. 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 2Q0 959 655 AT get to Airbag24?

You send the control unit 2Q0 959 655 AT as a parcel to Airbag24 or, for an extra charge, book a UPS collection. After the repair, Airbag24 sends it back to you by UPS.

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