Airbag control unit with part number 83A 959 655

What does the airbag control unit 83A 959 655 do?

Within the restraint system (SRS) of Audi, the airbag control unit 83A 959 655 handles the evaluation. It reads the crash sensors, decides in the event of an accident on airbags and seatbelt pretensioners, and monitors the system constantly.

Because an accident happens in a fraction of a second, the evaluation must work at all times. To ensure this, the unit checks the system continuously for faults.

Detected faults are reported via the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself; the lock is lifted only by a repair.

Why does the control unit 83A 959 655 fail?

Stored crash data left behind by an accident is the most common cause, even if no airbag deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes. Which of these applies to the 83A 959 655 only becomes clear through testing.

A diagnostic tool alone cannot make the stored crash data disappear either. Airbag24 removes it as part of the repair.

Age-related changes to the components, damp contacts at the plugs and fluctuations in the vehicle electrical system are among the other causes. Each of these has to be considered on its own.

How can you tell that the 83A 959 655 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently and thus indicates a defect in the 83A 959 655. A fault message may also appear, and the diagnostic tool fails to connect to the control unit.

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. So do not brush such signs aside.

A fault memory that cannot be cleared is another sign that the system needs to be checked.

Which vehicles is the 83A 959 655 fitted in?

The 83A 959 655 is fitted in these vehicles: Audi RSQ3 F3B Sportback (2019-2023).

These vehicles are recorded for this part number:

• Audi RSQ3 F3B Sportback (2019-2023)

Comparing the part number on the label of the removed unit with this page confirms that it is the correct unit. That alone says nothing about the defect. Have the fault memory read out beforehand, because this log shows whether the control unit itself is affected or whether a plug or cable is causing the problem.

How does the repair of the 83A 959 655 work?

First have the fault memory read out, attach the log and then disconnect the battery; only then remove the 83A 959 655. Next, create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 examines the control unit on the test bench. Defective components are repaired, the crash data is deleted, and a function test concludes the work. The unit then comes 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 83A 959 655 get to Airbag24?

You send the 83A 959 655 as a parcel or book a UPS collection for an extra charge. The return after the repair is by UPS.

Enclose the printed repair order with the parcel and pack the unit shock-proof.