Airbag control unit with part number 2Q0 959 655 BE

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

The 2Q0 959 655 BE is the central control unit of the restraint system (SRS) for Audi. It evaluates the signals from the crash sensors, decides in the event of a crash within milliseconds whether to trigger airbags and seatbelt pretensioners, and monitors the system continuously.

The housing additionally bears the manufacturer number Bosch 0285020277. The unit reports faults via the airbag warning light in the instrument cluster and stores them in the fault memory.

After an accident the control unit stores crash data and locks itself. This state is the starting point of every diagnosis.

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

The most common cause is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot erase it. Other causes are:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or a jump start

The crash data remains stored even if no airbag fired. Airbag24 erases it during the repair.

The other causes are of an everyday nature and develop over time.

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

Typical signs are:

• airbag warning light in the instrument cluster stays on continuously or intermittently
• fault message in the instrument cluster
• diagnostic tool gets no connection to the control unit
• fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then fail to trigger. The warning light is therefore a signal you should take seriously.

Only reading out the fault memory reveals which fault is actually present.

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

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

The following overview lists the vehicles stored for this part number.

• Audi A1 GB (from 2018)

The following steps will help you. Compare the part number on the label of the removed unit with this page; this makes sure it is the right unit. Also have the fault memory read out beforehand, because only that shows whether the control unit is defective or whether a plug or a 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 BE work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the 2Q0 959 655 BE. Next, create a repair order online and send in the well-packed unit; Airbag24 tests it on the test bench, replaces defective components, erases the crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days.

Your steps come first: reading out, the log, disconnecting the battery, removal. Only after that come the repair order and sending the unit.

At Airbag24 the unit is checked, components are replaced where necessary, and the function test concludes the work. 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 BE get to Airbag24?

You send the 2Q0 959 655 BE in as a parcel or book a UPS collection for an extra charge; after the repair Airbag24 returns it to you by UPS.

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