Airbag control unit with part number 80A 959 655 M

What does the airbag control unit 80A 959 655 M do?

The airbag control unit 80A 959 655 M controls the restraint system (SRS) in the Audi. It evaluates the signals from the crash sensors, selects the airbags and seatbelt pretensioners to be triggered in the event of an impact, and continuously checks the entire system. It reports faults via the airbag warning light.

The unit reaches its decision to trigger within fractions of a second, based on the strength and progression of the deceleration. While driving, it usually goes unnoticed.

After an accident, it stores crash data and locks itself.

Why does the control unit 80A 959 655 M fail?

The most common cause is crash data from a previous accident, even if no airbag was deployed. A standard diagnostic tool does not erase it. Other possible causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data stays in the unit until it is removed during repair. That is why a fault can occur even when the accident happened long ago.

Aged components lose reliability over the years, and damp connectors lead to contact problems. Voltage spikes, for example from a weak battery or a jump start, can also disrupt the electronics.

How can you tell that the 80A 959 655 M is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. As a result, airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is the most important sign. If it does not go out after the ignition is switched on, the fault must be checked.

Which vehicles is the 80A 959 655 M fitted in?

The airbag control unit 80A 959 655 M is fitted in these vehicles: Audi Q5 FY (2017-2020), FY Facelift (2020-2024) and FYB Sportback (2020-2024). Please check in advance whether your car is among them. The part number alone does not give a reliable answer to that.

The vehicles in detail:

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

Comparing the part number on the label of the removed unit with this page only confirms that you have the right unit in front of you. You should also have the fault memory read out. Only the log shows whether the control unit is defective or whether a connector or 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 N.

How does the repair of the 80A 959 655 M work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. After that, create a repair order online and send the unit in, well packed. At Airbag24, testing, repair and functional test usually take 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a functional test. The 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 80A 959 655 M get to Airbag24?

You send the unit as a parcel or, for an extra charge, book a UPS collection. After the repair, Airbag24 returns it to you by UPS.

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