Airbag control unit with part number A2469000903

What does the airbag control unit A2469000903 do?

The airbag control unit A2469000903 is the central control unit of the restraint system (SRS) of Mercedes-Benz. It evaluates the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit shows faults in the restraint system via the airbag warning light in the instrument cluster. Monitoring runs in the background.

After an accident, the control unit stores crash data and locks itself. The manufacturer's part number Bosch 0285011144 is also printed on the housing.

Why does the control unit A2469000903 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered, and a normal diagnostic tool cannot erase it. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

The crash data remains in the unit, and a simple attempt to erase it with the diagnostic tool does not help.

The other causes are general: components age over time, solder joints can go cold, and moisture attacks the plug connections.

Voltage spikes, for example from a weak battery or a jump start, can also damage the electronics.

How can you tell that the A2469000903 is defective?

A defect shows up as the airbag warning light in the instrument cluster lighting up, as a fault message in the instrument cluster, as a missing connection between the diagnostic tool and the control unit, and as a fault memory that cannot be cleared.

If the control unit is not working properly, airbags and seatbelt pretensioners may not trigger in an emergency. That is why the warning must be taken seriously.

Have the fault memory read out promptly, because the warning light has already reported the defect.

Which vehicles is the A2469000903 fitted in?

The airbag control unit A2469000903 is fitted in these vehicles: Mercedes-Benz B-Class W246 (2011-2018). Whether it suits your own vehicle is shown by comparing it with this list.

The assignment in detail can be found here.

• Mercedes-Benz B-Class W246 (2011-2018)

Compare the part number on the label of the removed unit with this page. This only ensures that it is the right unit. Also have the fault memory read out in advance, because the log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers A 246 900 07 09, A246 900 75 02, A2469006018.

How does the repair of the A2469000903 work?

You read out the fault memory first and attach the log. Then you disconnect the battery, remove the control unit A2469000903 and create a repair order online. Send the unit in well packed.

The order is fixed for safety reasons and must not be changed. The battery is disconnected before removal.

At Airbag24, the unit is tested on the test bench, defective components are repaired, the stored crash data is deleted and a function test follows. Testing, repair and the test take 3–4 working days as a rule, after which your own unit goes 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 A2469000903 get to Airbag24?

You send the control unit A2469000903 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

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