Airbag control unit with part number A4519015000

What does the airbag control unit A4519015000 do?

The control unit A4519015000 is the SRS control unit for vehicles from the Smart. It checks the sensor signals and, in an impact, determines within a few milliseconds which airbags and seatbelt pretensioners fire.

The system is monitored constantly during operation. Faults appear via the airbag warning light in the instrument cluster.

In an accident, the unit stores crash data and locks itself. The repair is the only way to lift the lock.

Why does the control unit A4519015000 fail?

The cause can be crash data stored after an accident, even when no airbag has fired. A standard diagnostic tool cannot erase it.

Airbag24 erases this data during the repair.

Aged electronic components are also a possibility. Cold solder joints, moisture and corrosion at plug connections belong to the causes as well.

Finally, voltage spikes can stress the unit, for example from a weak battery or a jump start.

How can you tell that the A4519015000 is defective?

A defect shows up as the airbag warning light, as messages in the instrument cluster, or as a fault memory that cannot be cleared.

• Airbag warning light stays on constantly or intermittently
• Error message in the instrument cluster
• No connection between the diagnostic tool and the control unit
• Fault memory cannot be cleared

In that case, the airbags and seatbelt pretensioners may fail to deploy in an emergency. A check should therefore take place promptly.

Which vehicles is the A4519015000 fitted in?

The control unit A4519015000 is fitted in these vehicles: Smart Fortwo C451 (2007-2015).

The following list shows the vehicles assigned to this part number:

• Smart Fortwo C451 (2007-2015)

Have the fault memory read out before removing the unit, so that it is clear whether the control unit really is defective. Then compare the part number on the label of the removed unit with this page.

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 A4519015000 work?

At Airbag24, checking, repairing and testing normally take 3–4 working days. Beforehand, you read out the fault memory, remove the control unit A4519015000 and create the repair order online.

Disconnect the battery before removal. Attach the log of the readout to the unit, then send it in well packed.

At Airbag24, defective components are replaced, the crash data is erased and a function test is carried out. 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 A4519015000 get to Airbag24?

You send the control unit A4519015000 as a parcel or book a UPS collection. After the repair, it comes back to you by UPS.

Place the printed repair order in the parcel. Pack the unit shock-proof.