Airbag control unit with part number 5C0959655AG

What does the airbag control unit 5C0959655AG do?

The 5C0959655AG is the airbag control unit that controls the restraint system (SRS) at Volkswagen. It evaluates the crash sensors, determines in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

In everyday use the electronics stay active in the background, so that they can react without delay in a crash.

If the unit detects a fault, it switches on the airbag warning light in the instrument cluster and stores the fault in the fault memory.

Why does the control unit 5C0959655AG fail?

Stored crash data is the most common cause after an accident, even if no airbag was triggered. A normal diagnostic tool cannot erase this data, but Airbag24 erases it during repair. In addition there are aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

The data arise after an accident and remain stored in the unit afterwards. Only the repair at Airbag24 makes them disappear.

Electronic components also age over time, solder joints can go cold, and moisture or corrosion damage plug connectors. Voltage spikes, for example from a weak battery or jump starting, also strain the unit.

How can you tell that the 5C0959655AG is defective?

The airbag warning light in the instrument cluster indicates the defect, either permanently or intermittently. Other signs that point to a malfunction may also appear.

• airbag warning light permanently on
• airbag warning light intermittently on
• fault message in the instrument cluster
• diagnostic tool without connection to the control unit
• fault memory cannot be cleared

If one of these indications appears, the airbags and seatbelt pretensioners may not trigger in an emergency.

A prompt check of the system is the right step in this case.

Which vehicles is the 5C0959655AG fitted in?

The control unit 5C0959655AG is fitted in these vehicles: Volkswagen Beetle Facelift (5C) (2016-2019) and A5 (5C) (2011-2016). The assignment is based on the part number and serves as a guide.

The list looks like this:

• Volkswagen Beetle Facelift (5C) (2016-2019)
• Volkswagen Beetle A5 (5C) (2011-2016)

Read the part number from the label of the removed unit and compare it with this page; then you have the right unit in front of you. Reading out the fault memory comes in addition: only that 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 5C0 959 655C, 5C0959655AB0MT, 5C0959655E, 5C0959655F.

How does the repair of the 5C0959655AG work?

First have the fault memory read out and enclose the log, then disconnect the battery. Only after that remove the control unit. Next, create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. The own unit is then returned to you.

At Airbag24 processing usually takes 3–4 working days, and this period concerns only 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 5C0959655AG get to Airbag24?

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

The papers, that is the printed repair order, go into the parcel; you pad the unit shock-resistant.