Airbag control unit with part number 2Q0 959 655 B

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

The airbag control unit 2Q0 959 655 B is the control unit of the restraint system (SRS) for Audi. It evaluates signals from the sensors that detect an impact and, in an emergency, decides whether airbags and seatbelt pretensioners are triggered. After an accident it stores crash data and locks itself.

The manufacturer's number Bosch 0285012951 is also printed on the housing.

The unit reports faults via the airbag warning light, which sits in the instrument cluster. It works continuously and monitors the sensor wiring and the firing circuits.

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

The most common fault on the 2Q0 959 655 B is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase this data. Aged electronics, moisture and corrosion at plugs, and voltage spikes are also to be mentioned.

• Aged electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or a jump start

Airbag24 erases the crash data during the repair.

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

A defect on the 2Q0 959 655 B can be recognised by the airbag warning light in the instrument cluster, which can light up permanently or intermittently. An error message in the instrument cluster is added. In addition, the diagnostic tool cannot establish a connection, and the fault memory cannot be cleared; in an emergency, airbags and seatbelt pretensioners may then fail to deploy.

A lit warning light is therefore a clear reason to have the system checked.

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

At Audi, the control unit 2Q0 959 655 B can be found in these vehicles: Audi A1 GB (from 2018).

Here follows an overview of the vehicles as Airbag24 keeps them.

• Audi A1 GB (from 2018)

Compare the part number on the label of the removed unit with this page. This only confirms the unit, not the cause. The cause is shown only by the fault log read out beforehand, which establishes whether the control unit is defective or a plug or cable is causing the fault.

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 B work?

The process begins with reading out the fault memory, and the log belongs in the parcel. Then disconnect the battery and only afterwards remove the control unit 2Q0 959 655 B. Finally, create a repair order online and send the well-packed unit.

At Airbag24 the unit goes onto the test bench, defective components are replaced and the crash data is erased. After a function test, your own unit goes back to you.

Processing takes 3–4 working days as a rule, and this refers only to checking, repairing and testing. 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 B get to Airbag24?

You send the control unit 2Q0 959 655 B as a parcel, or you book a UPS collection for an extra charge. The return after the repair is also made by UPS.

Pack the unit shock-proof and put the printed repair order inside.