Airbag control unit with part number 407000271AA

What does the airbag control unit 407000271AA do?

The airbag control unit 407000271AA is the central switching point of the restraint system (SRS) at Omoda. It reads the sensor signals that arise in an impact and decides within fractions of a second which airbags and seatbelt pretensioners are triggered.

While driving, the unit monitors all components of the system. If it detects a fault, it switches on the airbag warning light in the instrument cluster.

After an accident it writes crash data to its memory and then locks itself. Only the repair lifts the lock.

Why does the control unit 407000271AA fail?

Stored crash data from an accident are the most common cause, even if no airbag has deployed, and a normal diagnostic tool cannot clear them. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, as well as voltage spikes.

The unit creates the crash data, and the diagnostic tool cannot get at them. They therefore stay in the memory even if the accident had no visible effect on the airbags.

The remaining causes tend to develop over time: components age, solder joints can stay cold, and contacts take up moisture and rust. Voltage spikes arise, for example, from a weak battery or a jump start.

How can you tell that the 407000271AA is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message may appear in the instrument cluster. In addition, there is no connection to the diagnostic tool, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. So do not ignore a lit warning light.

As soon as the warning is visible, the system should be checked.

Which vehicles is the 407000271AA fitted in?

The control unit 407000271AA is fitted in these vehicles: Omoda 5 C5 (from 2023).

You will find an overview of the assigned models here:

• Omoda 5 C5 (from 2023)

Before removal, compare the number on the label with this page. This only shows that it is the right unit. Whether the control unit is defective or a plug or cable is the cause is decided only by the fault memory that has been read out. So have it read out beforehand.

How does the repair of the 407000271AA work?

You have the fault memory read out, attach the log, disconnect the battery and only then remove the control unit. Next you create a repair order online and send the well-packed unit. Airbag24 tests it on the test bench, repairs defective components, deletes the crash data and runs a function test before your own unit is returned. Processing at Airbag24 usually takes 3–4 working days.

The processes at Airbag24 are set up so that your own unit comes back with the crash data deleted.

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 407000271AA get to Airbag24?

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

The printed repair order belongs in the parcel. Pack the unit shock-proof so that it survives shipping undamaged.