Airbag control unit with part number 2Q0 959 655 AB

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

The airbag control unit 2Q0 959 655 AB forms the switching centre of the airbag system for Audi. In an accident it evaluates the sensor signals and determines within milliseconds which airbags and seatbelt pretensioners are triggered.

It monitors the entire system permanently. Faults are indicated via the airbag warning light, so that a defect does not remain hidden.

The manufacturer number Bosch 0285013523 is also printed on the housing. After an accident, the unit stores crash data and locks itself.

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

Crash data stored after an accident is the most common cause on the 2Q0 959 655 AB, even when no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes are aged components, moisture and corrosion at plugs, cold solder joints and voltage spikes, for example from a weak battery or a jump start.

The car can continue to run inconspicuously after an accident, yet the crash data remains in the unit. This is exactly where diagnosis starts.

Which of the other causes applies is shown only by testing the unit.

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

A defect on the 2Q0 959 655 AB shows up through the airbag warning light, which lights up permanently or intermittently, and through error messages in the instrument cluster. A missing connection to the diagnostic tool and a fault memory that cannot be cleared are equally typical.

These signs occur:

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

In an emergency, the airbags and seatbelt pretensioners may then fail to trigger. Do not rely on such a finding being harmless.

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

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

The vehicles in detail:

• Audi A1 GB (from 2018)

Compare the part number on the label of the removed unit with this page to make sure it is the correct unit. Have the fault memory read out beforehand, 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 AB work?

For the 2Q0 959 655 AB, first have the fault memory read out and enclose the log. Then disconnect the battery, only then remove the control unit. Afterwards create a repair order online and send the unit in well packed. At Airbag24, checking, repairing and function testing usually take 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Your own unit then goes back 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 AB get to Airbag24?

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

The printed repair order goes into the parcel, and you pack the unit shock-proof.