Airbag control unit with part number 992 959 655

What does the airbag control unit 992 959 655 do?

The airbag control unit 992 959 655 is the central control unit of the SRS restraint system in vehicles from Audi. It evaluates the crash sensors and, in an emergency, decides within milliseconds which airbags and seatbelt pretensioners fire. It also monitors the system and reports faults via the airbag warning light.

The sensors in the vehicle report accelerations to the control unit. There the measured values pass through fixed test routines before a trigger is released.

If an accident has occurred, the unit stores crash data and then locks itself.

Why does the control unit 992 959 655 fail?

The most common cause is the storage of crash data after an accident, even if no airbag has deployed; a standard diagnostic tool does not remove it. Other causes are ageing electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from jump-starting or a weak battery.

The crash data stays in the unit until it is erased during a repair.

Other causes develop gradually: components wear out and solder joints become brittle. Moisture and corrosion at plugs additionally disturb the contact.

How can you tell that the 992 959 655 is defective?

A defect shows through the airbag warning light, which burns permanently or intermittently. Accompanying it, fault messages appear, the diagnostic tool cannot reach the control unit, or the fault memory cannot be cleared. Then airbags and seatbelt pretensioners may not trigger in an emergency.

The control unit reports a fault via the display as soon as it detects one. The warning light is therefore one of the most important feedback signals of the system.

If the warning light comes on, have the vehicle checked promptly so that the cause can be narrowed down.

Which vehicles is the 992 959 655 fitted in?

The control unit 992 959 655 is fitted in these vehicles: Audi RS e-tron GT J9 FW (2020-2024); Audi e-tron GT J9 FW (2020-2024). You can check the match with your car before removal.

The vehicles known to us for this part number are listed here:

• Audi RS e-tron GT J9 FW (2020-2024)
• Audi e-tron GT J9 FW (2020-2024)

First compare the part number on the label of the removed unit with this page, so that you know it is the correct unit. Then have the fault memory read out, because only the log shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 992 959 655 D, 992 959 655 F, 992 959 655 G, 9J1880204E, 9J1880204F, 9J1880204J.

How does the repair of the 992 959 655 work?

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

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

Processing usually takes 3–4 working days and covers 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 992 959 655 get to Airbag24?

You send the control unit 992 959 655 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Pack the unit shock-resistant and enclose the printed repair order.