Airbag control unit with part number 11040809

What does the airbag control unit 11040809 do?

The airbag control unit 11040809 coordinates the airbags and seatbelt pretensioners in the restraint system of MG. An impact is detected by the crash sensors, and the unit then decides within milliseconds on triggering. At the same time it monitors the entire system and indicates faults on the airbag warning light.

In normal operation the control unit is not noticeable. It works in the background and checks the system constantly.

After an accident it stores crash data and locks itself. This lock can only be ended by the repair.

Why does the control unit 11040809 fail?

The most common cause is crash data stored after an accident, even without an airbag triggering. A normal diagnostic tool cannot remove it. Ageing components, dry solder joints, moisture and corrosion, and voltage spikes are also involved.

Crash data is created on impact and remains in memory. This also applies if the system does not trigger any airbags or seatbelt pretensioners.

Ageing components and dry solder joints are classic causes on the electronics side. On the connection side, moisture and corrosion damage the plugs.

Voltage spikes arise, for example, from a weak battery or when connecting to jump leads. They can put additional strain on the electronics.

How can you tell that the 11040809 is defective?

A fault shows itself through the airbag warning light, a fault message in the instrument cluster, a missing diagnostic connection or a fault memory that cannot be emptied. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

Typical signs at a glance:

• airbag warning light that stays on permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool with no connection to the control unit
• fault memory that cannot be erased

The light reports the finding itself, so a glance at the instrument cluster is enough to notice it.

In which vehicles is the 11040809 fitted?

The airbag control unit 11040809 is fitted in these vehicles: MG 5 1st generation (from 2021).

We have listed the vehicles for this part number below.

• MG 5 1st generation (from 2021)

Comparing the part number from the label of the removed unit with this page only confirms that you have the right unit. Whether the control unit is actually the cause only becomes clear from the fault memory, which you should have read out before removal.

How does the repair of the 11040809 work?

Before removal, have the fault memory read out and include the log; then disconnect the battery. Next, create a repair order online and send the unit off well packed. Airbag24 needs 3–4 working days as a rule for testing, repairing and function testing.

At Airbag24 the unit is tested on the test bench and defective components are replaced. The crash data is erased, followed by a function test before your own unit goes 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 11040809 get to Airbag24?

You can send the control unit 11040809 in yourself as a parcel, or book a UPS collection for an extra charge. The return after the repair is handled by UPS.

Include the printed repair order with the parcel and pack the unit so that it is shock-resistant.