Airbag control unit with part number A4519010501

What does the airbag control unit A4519010501 do?

The airbag control unit A4519010501 coordinates the restraint system in the Smart: from the signals of the crash sensors, it calculates within milliseconds which airbags and seatbelt pretensioners are triggered.

It also monitors the entire system during operation. If it finds a fault, it switches on the airbag warning light in the instrument cluster.

After an accident, the control unit creates crash data and locks itself.

Why does the control unit A4519010501 fail?

The most common cause with the A4519010501 is stored crash data from an accident, even if no airbag has fired. Other causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data cannot be cleared with a standard diagnostic tool, because it cannot be erased that way. Airbag24 erases it as part of the repair.

Aged electronic components and cold solder joints are also conceivable, as are moisture or corrosion at plug connections.

How can you tell that the A4519010501 is defective?

A defect in the A4519010501 becomes visible through the airbag warning light in the instrument cluster when it stays on constantly or intermittently, and also through an error message, a missing connection between the diagnostic tool and the control unit, or a fault memory that cannot be cleared.

In an emergency, the airbags and seatbelt pretensioners may then fail to deploy. The warning light indicates the fault, so a prompt check is advisable.

Which vehicles is the A4519010501 fitted in?

The control unit A4519010501 is fitted in these vehicles: Smart Fortwo C451 (2007-2015).

Here follows the list of vehicles with this part number.

• Smart Fortwo C451 (2007-2015)

Before removing the unit, compare the number on the label with this page. The comparison only shows whether you have the correct unit. Also have the fault memory read out, because only this 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 A451 820 24 85, A4518201585/001, A4518202285, A4518202485/002, A4519011300Q02.

How does the repair of the A4519010501 work?

For the A4519010501, you first have the fault memory read out and attach the log. Then you disconnect the battery and only then remove the control unit. Last, you create the repair order online and send the unit in well packed.

Airbag24 examines the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Afterwards your own unit goes back to you.

Checking, repairing and testing at Airbag24 are normally scheduled for 3–4 working days.

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 A4519010501 get to Airbag24?

The A4519010501 reaches Airbag24 either as a parcel or via a UPS collection booked for an extra charge. After the repair, it goes back to you by UPS.

Place the printed repair order in the parcel and pack the unit shock-proof before handing it over.