Airbag control unit with part number 2Q0 959 655 AJ

What does the airbag control unit 2Q0 959 655 AJ do?

The airbag control unit 2Q0 959 655 AJ forms the central control unit of the restraint system for Audi. It processes the measurements from the crash sensors, determines within fractions of a second in an accident which airbags and seatbelt pretensioners are triggered, and checks the system continuously for faults.

The supplier number Bosch 0285014910 is also printed on the housing. Detected faults are reported by the airbag warning light in the instrument cluster.

After an accident the control unit stores crash data and locks itself. A reported fault should therefore be checked promptly, so that the function of the restraint system can be clearly assessed again.

Why does the control unit 2Q0 959 655 AJ fail?

The most common cause is stored crash data after an accident, even if no airbag has deployed, and a standard diagnostic tool cannot erase it. Further causes may also apply to the 2Q0 959 655 AJ, namely ageing components, soldered joints, moisture on contacts and voltage spikes in the vehicle electrical system.

Crash data is stored in the event of an accident, regardless of whether a seatbelt pretensioner or an airbag actually fired. A commercially available diagnostic tool cannot reach it to erase it, so the message remains in memory.

These further causes are also possible:

• wear and ageing of the electronic components
• poorly soldered points on the circuit board
• moisture and rust at plug connections
• voltage spikes from the vehicle electrical system, for example with a weakened battery

How can you tell that the 2Q0 959 655 AJ is defective?

A defect on the 2Q0 959 655 AJ shows itself through the airbag warning light in the instrument cluster staying on permanently or intermittently, through an error message in the instrument cluster, through no connection to the diagnostic tool, and through a fault memory that cannot be cleared.

Typical signs are:

• Warning light permanently or intermittently on
• Error message in the instrument cluster
• No connection to the diagnostic tool
• Fault memory cannot be cleared

With these signs, airbags and seatbelt pretensioners may fail to deploy in an emergency. The warning concerns the entire restraint system, even if the vehicle behaves completely normally in everyday use.

Which vehicles is the 2Q0 959 655 AJ fitted in?

The control unit 2Q0 959 655 AJ is fitted in these vehicles: Audi A1 GB (from 2018).

The allocation covers these models:

• Audi A1 GB (from 2018)

Compare the part number on the label of the removed unit with this page, because that only confirms that it is the right unit. Have the fault memory read out beforehand, because only the log 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 2Q0 959 655 AK, 2Q0959655AC.

How does the repair of the 2Q0 959 655 AJ work?

For the 2Q0 959 655 AJ, first have the fault memory read out and enclose the log. Then disconnect the battery, and only then remove the control unit. Then create a repair order online and send in the unit, well packed.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Processing usually takes 3–4 working days at Airbag24, before your own unit is sent back.

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 2Q0 959 655 AJ get to Airbag24?

You send the control unit 2Q0 959 655 AJ in as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back by UPS.

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