Airbag control unit with part number A2469000809

What does the airbag control unit A2469000809 do?

The airbag control unit A2469000809 coordinates the restraint system (SRS) of Mercedes-Benz. It evaluates crash sensors, determines in a crash which airbags and seatbelt pretensioners trigger, and monitors the system continuously. Reported faults appear via the airbag warning light.

The manufacturer number Bosch 0285011816 is also printed on the housing. The control unit works for as long as the ignition is switched on.

After an accident the unit stores crash data and locks itself.

Why does the control unit A2469000809 fail?

The most common cause is stored crash data, even if no airbag has deployed; it cannot be cleared with a standard diagnostic tool. Other causes are aged electronic components, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data remains stored after an incident, even if the vehicle looks unremarkable from the outside. Its presence is therefore no proof that an airbag has deployed.

Ageing and cold solder joints affect the electronics, as does moisture on the connectors.

Voltage spikes, for example from a weak battery or a jump-start, additionally strain the circuit.

How can you tell that the A2469000809 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, or the fault memory cannot be cleared. In this case, the airbags and seatbelt pretensioners may possibly not deploy in an emergency.

• Airbag warning light permanently on
• Airbag warning light intermittently on
• Fault message in the instrument cluster
• Diagnostic tool without connection to the control unit
• Fault memory cannot be cleared

The warning light should be taken seriously even if the vehicle otherwise drives normally.

Which vehicles is the A2469000809 fitted in?

The A2469000809 is fitted in these vehicles: Mercedes-Benz B-Class W246 (2011-2018). Compare this list with your vehicle.

The following vehicles are assigned to this part number:

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

Compare the part number on the label of the removed unit with this page. This only shows that it is the correct unit. Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or a connector 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 A2469000809 work?

You have the fault memory read out first and enclose the log. Then disconnect the battery and afterwards remove the control unit. Next, create the repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and clears the stored crash data before a function test follows. Afterwards, 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 A2469000809 get to Airbag24?

You send the control unit A2469000809 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Enclose the printed repair order in the parcel and pack the unit shock-resistant.