Airbag control unit with part number 12249649

What does the airbag control unit 12249649 do?

The airbag control unit 12249649 coordinates the restraint system (SRS) of Hummer. It processes the signals from the crash sensors and decides in a crash, within milliseconds, which airbags and seatbelt pretensioners are triggered.

The unit also checks the entire system continuously. If it finds a fault, it indicates this via the airbag warning light in the instrument cluster.

If a crash occurs, crash data is stored and the unit locks itself.

Why does the control unit 12249649 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered; a standard diagnostic tool cannot erase it. Ageing electronics, dry solder joints, moisture at plug connectors and voltage spikes are also conceivable.

Crash data is accident data stored in the unit. The other causes lie more in the electronics themselves or their connections, and a check must show which of them applies.

How can you tell that the 12249649 is defective?

An error message in the instrument cluster, no connection between the diagnostic tool and the control unit, and a fault memory that cannot be erased indicate a defect, and so does the airbag warning light.

The airbag warning light in the instrument cluster may stay on permanently or light up intermittently as soon as something in the system is wrong. Then airbags and seatbelt pretensioners may not trigger in an emergency, which is why you should not ignore the light.

Which vehicles is the 12249649 fitted in?

The airbag control unit 12249649 is fitted in these vehicles: Hummer H2 SUV.

You can find the assigned models here:

• Hummer H2 SUV

Matching the label number with this page only confirms the right unit; whether it is defective is shown by the fault memory, which you should have evaluated before removal.

For the same vehicles, we also repair control units with the part numbers 10366054, 15190658, 15192449, 21992894, 21992895.

How does the repair of the 12249649 work?

You have the fault memory read out, attach the log and then disconnect the battery before removing the control unit. Afterwards you create a repair order online and pack the unit carefully for sending. At Airbag24, inspection, repair and testing usually take 3–4 working days.

On the test bench, Airbag24 checks the unit, repairs the defective components, erases stored crash data and tests the function. Afterwards your own unit comes back to you.

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 12249649 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. The return after repair is likewise made by UPS.

A shockproof packed unit and the printed repair order belong together in the parcel.