Airbag control unit with part number 5Q0959655BP

What does the airbag control unit 5Q0959655BP do?

The airbag control unit 5Q0959655BP controls the restraint system (SRS) of Audi. It evaluates the signals from the crash sensors, decides in a crash within milliseconds which airbags and seatbelt pretensioners trigger, and monitors the system continuously.

The control unit reports faults via the airbag warning light in the instrument cluster. This makes it the point where all sensor data comes together. Without a functioning control unit, the restraint system cannot fulfil its task.

After a crash, the unit stores crash data and locks itself.

Why does the control unit 5Q0959655BP fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other possible causes are aged electronic components, cold solder joints, moisture or corrosion at plug connections, and voltage spikes.

Crash data can also be in the control unit when no airbag has deployed. The unit stores it after an accident, and a commercially available diagnostic tool cannot remove it.

The other causes are of a more general nature. Electronics age, solder joints can have gone cold, and moisture or corrosion at plug connections disrupts signal transmission. Voltage spikes, for example from a weak battery or jump-starting, can also harm the unit.

How can you tell that the 5Q0959655BP is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which lights up continuously or intermittently, through an error message in the instrument cluster, through a lack of connection to the diagnostic tool, and through a fault memory that cannot be cleared.

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

If the light is on, the control unit itself is not automatically defective. A plug or a cable can be the cause just as well. Only the read-out fault memory shows more precisely what the cause is.

Important: in the event of a fault in the restraint system, airbags and seatbelt pretensioners may possibly not deploy in an emergency. So have the system checked promptly and do not simply carry on driving.

Which vehicles is the 5Q0959655BP fitted in?

The control unit 5Q0959655BP is fitted in these vehicles: Audi Q3 F3B (2019-2025) and F3 (2018-2025); Audi SQ3 F3B Sportback (2019-2025). The list helps narrow things down, but the unit must still be examined.

The list below shows the vehicles for which we hold this part number.

• Audi Q3 F3B (2019-2025)
• Audi Q3 F3 (2018-2025)
• Audi SQ3 F3B Sportback (2019-2025)

First compare the part number on the label of the removed unit with this page. This only ensures that you have the correct unit in front of you. Also have the fault memory read out beforehand, because only this record 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 5Q0 959 655 CC, 5Q0959655BF, 5Q0959655BQ, 83A 959 655.

How does the repair of the 5Q0959655BP work?

Have the fault memory read out first and enclose the log with the unit. Then disconnect the battery and only then remove the control unit. Then create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the team first checks the unit on the test bench. Defective components are replaced, stored crash data is erased, and then a function test follows. Afterwards your own unit is sent back to you.

The order of steps on the vehicle serves safety and is therefore binding. So always start by reading out the fault memory.

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 5Q0959655BP get to Airbag24?

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

Enclose the printed repair order in the parcel and pack the unit shock-resistant. This keeps it protected during transport.