Airbag control unit with part number 8W0 959 655 G

What does the airbag control unit 8W0 959 655 G do?

The airbag control unit 8W0 959 655 G is the central control unit of the restraint system (SRS) of Audi. It evaluates the signals from the crash sensors and decides in a crash, within milliseconds, which airbags and seatbelt pretensioners are triggered.

In addition, the housing carries the manufacturer number Bosch 0285013645. The unit also monitors the system continuously and reports faults via the airbag warning light.

After an accident, it stores crash data and locks itself.

Why does the control unit 8W0 959 655 G fail?

The most common cause is stored crash data, even if no airbag was triggered. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, as well as voltage spikes, are also possible.

A normal diagnostic tool cannot erase crash data. The data therefore stay in the control unit until they are removed during a repair.

Voltage spikes occur, for example, with a weak battery or when jump-starting. Which cause applies in the individual case is shown by the examination.

How can you tell that the 8W0 959 655 G is defective?

The airbag warning light stays on permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In this case, airbags and seatbelt pretensioners may not trigger in an emergency.

The light shows the fault itself as soon as the system detects it. Therefore pay attention to every illumination.

If there is no connection to the diagnostic tool, that points to the control unit or its wiring. A specialist workshop assesses the findings.

In which vehicles is the 8W0 959 655 G fitted?

The 8W0 959 655 G is fitted in these vehicles: Audi RS4 B9 8W (2017-2024); Audi A4 B9 8W (2015-2019) and B9 8W Facelift (2019-2024).

The vehicles recorded in our data for this part number are listed here:

• Audi RS4 B9 8W (2017-2024)
• Audi A4 B9 8W (2015-2019)
• Audi A4 B9 8W Facelift (2019-2024)

Compare the part number on the label of the removed unit with this page. This only ensures that it is the right unit. Also have the fault memory read out beforehand, 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 28501194, 5WK43749, 8W0 959 655, 8W0 959 655F, 8W0959655A, 8W0959655H.

How does the repair of the 8W0 959 655 G work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit. Next, create a repair order online and send the unit in well packed.

At Airbag24 the unit is checked on the test bench, defective components are replaced, crash data are erased and a function test is carried out. Afterwards, the control unit goes back to you.

Processing at Airbag24 usually takes 3–4 working days, counted for checking, repairing and testing alone.

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 8W0 959 655 G get to Airbag24?

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

Put the printed repair order in the parcel and pack the unit shockproof.