Airbag control unit with part number 2Q0 959 655 AS

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

The airbag control unit 2Q0 959 655 AS controls the restraint system of Audi. It continuously checks the sensor signals, decides in an accident within milliseconds on the triggering of airbags and seatbelt pretensioners, and reports detected faults.

The task has two parts: in an emergency the triggering must be exactly right, and in everyday use the unit must detect every fault. In addition, the number Bosch 0285015370 is printed on the housing.

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

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

For the 2Q0 959 655 AS, crash data is the most common cause: it stays in the memory after an accident, even if no airbag has been triggered. An ordinary diagnostic tool cannot remove it; Airbag24 deletes it as part of the repair. Other causes of failure are aged electronics, cold solder joints, moisture and corrosion at plugs, and voltage spikes.

Components age, and their properties change over time. Poorly made solder joints can lose electrical contact, which only shows up after longer operation.

If moisture enters plug connections, corrosion forms and the transition resistance rises. Voltage spikes when starting with external power also stress the electronics.

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

On the 2Q0 959 655 AS, a defect shows itself through the airbag warning light in the instrument cluster, which stays on permanently or intermittently. In addition, a fault message appears in the instrument cluster, the diagnostic tool finds no connection, or the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then possibly not trigger. The light shows the fault itself, so a prompt check is the right course of action.

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

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

The following vehicles are recorded for this part number:

• Audi A1 GB (from 2018)

Comparing the part number on the label of the removed unit with this page only confirms that it is the correct unit. Have the fault memory read out before removal, because only this result 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 AS work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Then create a repair order online and send the unit in well packed. Checking, repairing and testing at Airbag24 usually take 3–4 working days.

The sequence is fixed for safety reasons. The control unit is only removed from the vehicle once the battery has been disconnected.

At Airbag24 the unit is examined on the test bench. Defective components are replaced, crash data is deleted, and then a functional test follows. Afterwards 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 2Q0 959 655 AS get to Airbag24?

Either you send the 2Q0 959 655 AS in as a parcel, or you book a UPS collection for an extra charge. UPS handles the return journey: Airbag24 sends the repaired unit back by UPS.

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