Airbag control unit with part number 80A959655N

What is the function of the airbag control unit 80A959655N?

The airbag control unit with part number 80A959655N is the central control module for the passive safety system in Audi Q5 and SQ5 vehicles of the FY series. It processes signals from crash sensors and, in the event of a collision, precisely and within seconds deploys the airbags and seatbelt pretensioners.

As the “brain” of the restraint system, this component continuously monitors all connected sensors and actuators. It analyzes acceleration and pressure data to determine the severity and type of impact. Based on this analysis, the control unit decides which safety systems—such as front, side, or head airbags, as well as seatbelt pretensioners—should be activated to provide optimal occupant protection.

In addition, the device communicates with other vehicle systems and stores all relevant events, including fault codes and crash data, in its internal memory. Therefore, proper functionality is essential for vehicle safety.

What defects occur in the 80A959655N?

The most common causes of failure for the control unit 80A959655N are crash data stored internally after an accident, which prevent further use, as well as obvious hardware defects. The latter can result from moisture-related damage, such as water ingress, or from the failure of electronic components on the circuit board.

A very common reason for a lit airbag warning light is the storage of crash data. After a collision, the control unit locks itself for safety reasons, even if the airbags did not deploy. This condition can only be resolved through professional electronic repair, where the stored data is reset.

Furthermore, hardware damage is a typical source of failure. Penetrating moisture can cause corrosion and short circuits on the circuit board. Likewise, the failure of individual electronic components, such as processors or memory chips, leads to complete device malfunction, often manifesting as a loss of communication.

How do you recognize a defect in the 80A959655N control unit?

A defect in the airbag control unit 80A959655N primarily manifests through two symptoms: a permanently illuminated airbag warning light on the instrument cluster and a lack of communication between the control unit and a diagnostic tool. These signs indicate a serious internal fault that compromises vehicle safety.

The most obvious symptom is the persistent airbag warning light. It does not turn off after starting the vehicle, signaling to the driver that the restraint system is not operational. In the event of a crash, there is a risk that airbags and seatbelt pretensioners may fail to deploy correctly—or not at all.

Another clear indication is when a workshop cannot establish communication with the airbag control unit using a diagnostic tool. The device fails to respond to diagnostic requests, complicating troubleshooting and usually pointing to an internal hardware or software defect within the control unit itself.

In which vehicles is the 80A959655N control unit installed?

The airbag control unit 80A959655N is specifically used in the Audi Q5 and SQ5 models of the FY generation. This includes both the original models, facelift variants, and Sportback versions. At Airbag24, we repair this control unit for the entire model range.

Specifically, this part number is used in the following Audi models:

- Audi Q5 (FY type, model years 2017–2020)

- Audi Q5 Facelift (FY type, model years 2020–2024)

- Audi SQ5 (FY type, model years 2017–2020)

- Audi SQ5 Facelift (FY type, model years 2020–2024)

- Audi Q5 Sportback (FYB type, model years 2020–2024)

How does the repair of the 80A959655N proceed at Airbag24?

The repair process at Airbag24 begins with a detailed hardware and software inspection of the submitted control unit. Depending on the nature of the fault, stored crash data is erased, defective electronic components are replaced, or all data is cloned onto a replacement unit. Final functional tests ensure quality, backed by a 12-month warranty.

Once the removed control unit arrives at Airbag24, our technicians perform a comprehensive incoming inspection to pinpoint the exact cause of the failure. This is carried out on specialized test benches that simulate real‑world driving conditions.

Subsequent repairs depend on the diagnosis. If crash data is stored, the device’s internal memory is professionally reset. If a hardware defect is present—such as damage caused by water—the corroded or faulty components on the circuit board are expertly replaced. If repair is not feasible, the control unit can be cloned by transferring vehicle‑specific data to a functioning replacement unit.

Each repair is completed with a final test to ensure full functionality. We provide a 12-month warranty on all work performed.

What shipping options does Airbag24 offer?

Airbag24 offers flexible and secure shipping solutions. You can either send your defective control unit back at no cost yourself, or arrange a convenient UPS pickup from a location of your choice. For returns, you have access to free standard UPS shipping as well as faster express and cash-on-delivery options.

For sending your unit to us, you have two choices: you can ship the package yourself, or use our convenient UPS pickup service, which collects the control unit directly from your location.

After successful repair, return shipping is provided free of charge via standard UPS by default. If you need it faster, you can opt for UPS Express shipping. Both options are also available with cash-on-delivery. Alternatively, you can pick up the repaired unit in person at our facility.