Airbag control unit with part number 3Q0959655R

What does the airbag control unit 3Q0959655R do?

The airbag control unit 3Q0959655R is the central control unit of the restraint system (SRS) of Seat. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

Outside an accident, the unit monitors the entire system continuously. If it detects a fault, it displays it 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 3Q0959655R fail?

The most common cause for the 3Q0959655R is crash data stored after an accident, even if no airbag has triggered. Further causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

An ordinary diagnostic tool cannot delete this crash data, so the fault remains for the time being. The other causes at a glance:

• aged electronic components
• cold solder joints on the circuit board
• moisture and corrosion on plug connections
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 3Q0959655R is defective?

The airbag warning light in the instrument cluster lights up on the 3Q0959655R permanently or intermittently. Error messages in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared are added to this.

As long as these signs persist, airbags and seatbelt pretensioners may not trigger in an emergency. Take the warning seriously and have it checked promptly.

The light is the clearest indication the vehicle gives, and a good reason to have the system checked.

Which vehicles is the 3Q0959655R fitted in?

The 3Q0959655R is fitted in these vehicles: Seat Leon 3 [5F] (2012-2020).

The following list is stored for this part number:

• Seat Leon 3 [5F] (2012-2020)

Compare the part number on the label of the removed unit with this page. This only tells you that it is the right unit. Also have the fault memory read out, because only this result shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 3Q0 959 655 AA, 3Q0 959 655 AC, 3Q0 959 655 AS, 3Q0 959 655 BH, 3Q0 959 655 CM, 3Q0 959 655 P.

How does the repair of the 3Q0959655R work?

First have the fault memory read out at the 3Q0959655R and enclose the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, replaces defective components and deletes stored crash data. A function test follows, after which your own unit is returned to you.

Airbag24 usually plans 3–4 working days for checking, repairing and testing. 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 3Q0959655R get to Airbag24?

You send the 3Q0959655R as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back by UPS.

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