Airbag control unit with part number A4519011500

What does the airbag control unit A4519011500 do?

The airbag control unit A4519011500 is the central control unit of the restraint system (SRS) for Smart. It evaluates the crash sensors, decides within milliseconds in an accident on triggering the airbags and seatbelt pretensioners, and monitors the system continuously.

It reports faults via the airbag warning light. After an accident it stores crash data and locks itself.

Why does the control unit A4519011500 fail?

The main cause is crash data stored in the memory after an accident, even if no airbag has deployed. Other causes include ageing electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data stays stored until it is specifically removed, and a standard diagnostic tool cannot erase it.

The other causes arise in the vehicle's everyday use. Solder joints can go cold, components age, and moisture lets contacts corrode.

Voltage spikes occur when the battery is weakening or a vehicle is started with a jump start.

How can you tell that the A4519011500 is defective?

The airbag warning light in the instrument cluster lights permanently or intermittently. Added to this are fault messages in the instrument cluster, a disrupted connection to the diagnostic tool and a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to trigger.

The warning light is the most direct indication the control unit gives. If you take it seriously in good time, you can narrow down the cause early.

A diagnostic tool with no connection to the control unit is likewise a signal that something in the system is wrong.

Which vehicles is the A4519011500 fitted in?

In this vehicle, the airbag control unit A4519011500 is fitted: Smart Fortwo C451 (2007-2015).

The list of vehicles that belong to this part number follows below.

• Smart Fortwo C451 (2007-2015)

(a) Matching the part number on the device label with this page only ensures that it is the correct unit; it achieves nothing more. (b) The fault memory read out beforehand, by contrast, clarifies 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 A4519011500 work?

Airbag24 generally needs 3–4 working days for testing, repairing and checking. Before removal, you read out the fault memory, disconnect the battery and only then remove the control unit A4519011500.

Then you create a repair order online, enclose the log and pack the unit well.

Airbag24 tests the unit, replaces defective components, erases crash data and carries out a function test before your own unit is returned. 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 A4519011500 get to Airbag24?

You send the control unit A4519011500 as a parcel or book a UPS collection for an extra charge. The return after repair is made by UPS.

Pack the unit shock-resistant and enclose the printed repair order in the parcel.