Airbag control unit with part number 6C0 959 655 AP

What does the airbag control unit 6C0 959 655 AP do?

The airbag control unit 6C0 959 655 AP is the central SRS control unit for Volkswagen. It checks the signals from the crash sensors and decides in a crash, within a fraction of a second, which airbags and seatbelt pretensioners are activated.

While driving, it monitors the system continuously and shows faults via the airbag warning light.

After an accident it stores crash data and locks itself. This state remains invisible to the driver in everyday use, even though the unit is constantly at work.

Why does the control unit 6C0 959 655 AP fail?

The most common cause is crash data stored after an accident, even without an airbag having been triggered; a normal diagnostic tool cannot remove it. Other possible causes include aged electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The unit stores crash data quietly. The vehicle can look completely inconspicuous from the outside while an entry already exists in the control unit.

The other causes tend to develop gradually. Electronic components wear out over the years, solder joints can go cold, and moisture or corrosion on the contacts worsens the connection. A weak battery or jump-starting can also cause voltage spikes that stress the electronics.

How can you tell that the 6C0 959 655 AP is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears. In addition, there may be no connection between the diagnostic tool and control unit 6C0 959 655 AP, and a fault memory that cannot be cleared. In that case the airbags and seatbelt pretensioners may not deploy in an emergency.

You should therefore react to this warning light without delay, as it reports the state of the restraint system directly in your line of sight.

Such a warning deserves prompt clarification, so that what is actually present can be checked.

Which vehicles is the 6C0 959 655 AP fitted in?

The control unit 6C0 959 655 AP is fitted in these vehicles: Volkswagen Polo 5 (6C) (2014-2017).

The models are shown here:

• Volkswagen Polo 5 (6C) (2014-2017)

Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit. Before that, have the fault memory read out, as only that shows whether the control unit is defective or whether a plug or cable is behind the fault.

For the same vehicles, we also repair control units with the part numbers 285010527, 6C0 959 655 A, 6C0 959 655 J, 6R0 959 655 K, 6R0959655C.

How does the repair of the 6C0 959 655 AP work?

First have the fault memory read out and enclose the log, then disconnect the battery and only afterwards remove control unit 6C0 959 655 AP. Then create a repair order online and pack the unit well before sending it.

Airbag24 then checks the unit on the test bench, replaces defective components, erases stored crash data and tests the function. After that, your own unit is returned to you.

Processing at Airbag24 usually takes 3–4 working days. 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 6C0 959 655 AP get to Airbag24?

You can send control unit 6C0 959 655 AP as a parcel or have it collected by UPS for an extra charge. Airbag24 returns it to you by UPS after the repair.

Pack the unit shockproof and enclose the printed repair order.