Airbag control unit with part number 2Q0 959 655 AL

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

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

The manufacturer's number Bosch 0285014999 is additionally stamped on the housing. It helps with assignment, but the part number on the label remains decisive.

After an accident the control unit stores crash data and locks itself. The lock is lifted only by repairing the unit.

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

The most common cause is stored crash data: it stays in the unit after an accident even if no airbag has deployed, and a normal diagnostic tool cannot erase it. Other causes include aged components, cold solder joints, moisture and voltage spikes.

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

The list covers causes that develop over very different timescales, from slow ageing to sudden voltage spikes.

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

The airbag warning light in the instrument cluster stays on permanently or intermittently when there is a fault. Accompanying this, the instrument cluster shows a fault message, the diagnostic tool finds no connection to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then possibly not deploy.

If the warning light comes on, have the system checked promptly. Do not wait for the display to clear itself, because it signals a fault that continues to exist.

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

For this part number we have vehicles on record. The control unit 2Q0 959 655 AL is fitted in these vehicles: Audi A1 GB (from 2018).

The list shows the assignment as it is held with us.

• Audi A1 GB (from 2018)

Compare the part number on the label of the removed unit with this page; this only ensures that it is the correct unit. Also have the fault memory read out beforehand. Only this result shows whether the control unit is defective or 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 AL work?

First read out the fault memory and attach the log. Then disconnect the battery and only then remove the unit. Next, create a repair order online and send in the well-packed unit. Airbag24 checks it on the test bench, replaces defective components, deletes the crash data and runs a function test; the unit then returns to you.

Processing at Airbag24 usually takes 3–4 working days. This period applies 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 AL get to Airbag24?

Send the control unit 2Q0 959 655 AL to us as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Enclose the printed repair order in the parcel and pack the unit shockproof.