Airbag control unit with part number A4519017600

What does the airbag control unit A4519017600 do?

The airbag control unit A4519017600 is the central unit of the restraint system (SRS) for Smart. It evaluates the signals from the crash sensors, decides in an accident within milliseconds on the airbags and seatbelt pretensioners, and monitors the system continuously. It reports faults via the airbag warning light.

During operation the unit checks sensors, firing circuits and the wiring. Deviations are recorded in the fault memory.

After an accident it stores crash data and locks itself.

Why does the control unit A4519017600 fail?

Crash data after an accident is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from a weak battery.

The crash data remains in the control unit until Airbag24 removes it during the repair.

The other causes lie in the electronics or the contacts. A jump start can also lead to voltage spikes.

How can you tell that the A4519017600 is defective?

Typical signs are an airbag warning light in the instrument cluster that stays on constantly or intermittently, a fault message there, a diagnostic tool without a connection to the control unit, and a fault memory that cannot be cleared.

• airbag warning light stays on constantly or intermittently
• fault message in the instrument cluster
• diagnostic tool finds no connection to the control unit
• fault memory cannot be cleared

With these signs, airbags and seatbelt pretensioners may possibly fail to deploy in an emergency.

Which vehicles is the A4519017600 fitted in?

The A4519017600 is fitted in these vehicles: Smart Fortwo C451 (2007-2015).

Here is the list of vehicles:

• Smart Fortwo C451 (2007-2015)

On the one hand: compare the part number on the label of the removed unit with this page, so that the correct unit is certain. On the other hand: have the fault memory read before removal. Only this log shows whether the control unit or a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers A451 820 24 85, A4518201585/001, A4518202285, A4518202485/002, A4519011300Q02.

How does the repair of the A4519017600 work?

The fault memory is read first and the log is attached, then the battery is disconnected and only then the control unit is removed. Create a repair order online and send the unit in well packed. Checking, repairing and testing at Airbag24 usually take 3–4 working days.

The order is there for your safety and must be followed.

Airbag24 checks the unit on the test bench, replaces defective components, deletes crash data and carries out a function test. 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 A4519017600 get to Airbag24?

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

The printed repair order goes into the parcel. Pack the control unit securely against shocks.