Airbag control unit with part number 8W0959655AD

What does the airbag control unit 8W0959655AD do?

The airbag control unit 8W0959655AD controls the restraint system (SRS) and evaluates the signals from the crash sensors. In an accident, it decides within milliseconds which airbags and seatbelt pretensioners are triggered.

On vehicles from Audi, it monitors the system continuously. It shows faults via the airbag warning light in the instrument cluster.

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

Why does the control unit 8W0959655AD fail?

The most common cause of control unit 8W0959655AD failing is the storage of crash data after an accident, even without a triggered airbag. Erasing this data is often not possible on this unit; if you want the data erased, contact Airbag24 briefly before sending it in. Other causes are aged components, moisture at connectors and voltage spikes.

Airbag24 checks the number before a unit is sent in.

Other causes include ageing of the electronics, cold solder joints and corrosion on connectors. Voltage spikes, for example from a weak battery or jump-starting, also stress the control unit.

How can you tell that the 8W0959655AD is defective?

On control unit 8W0959655AD, you recognise a defect by the airbag warning light in the instrument cluster when it lights up permanently or intermittently, by a fault message, or by a fault memory that cannot be cleared.

An airbag warning light that stays on permanently or intermittently is a clear sign of a fault. The instrument cluster also shows fault messages, and the diagnostic tool finds no connection to the control unit.

A fault memory that cannot be cleared is also one of these signs. In an emergency, airbags and seatbelt pretensioners may then not trigger. Have the finding checked promptly.

Which vehicles is the 8W0959655AD fitted in?

The control unit 8W0959655AD is fitted in these vehicles: Audi Q5 FYB Sportback (2020-2024), FY Facelift (2020-2024) and FY (2017-2020). This information comes from our assignment to the part number.

Our assignment lists these vehicles:

• Audi Q5 FYB Sportback (2020-2024)
• Audi Q5 FY Facelift (2020-2024)
• Audi Q5 FY (2017-2020)

Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit. Have the fault memory read out beforehand. Only this result shows whether the control unit is defective or whether a connector or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 80A 959 655 AA, 80A 959 655 AC, 80A 959 655 AE, 80A 959 655 G, 80A 959 655 J, 80A 959 655 L.

How does the repair of the 8W0959655AD work?

First have the fault memory of control unit 8W0959655AD read out and disconnect the battery; only then remove the unit. Then send the unit in well packed with an online repair order. Processing at Airbag24 usually takes 3–4 working days.

The fault memory log belongs in the parcel. The sequence during removal is mandatory for safety reasons.

Airbag24 checks the unit on the test bench, replaces defective components and carries out a function test. Afterwards, your own unit returns to you. If you want the crash data erased, contact Airbag24 briefly before sending it in. 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 8W0959655AD get to Airbag24?

You can send the unit as a parcel; alternatively, book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the unit shock-resistant.