Airbag control unit with part number 8200402401

What does the airbag control unit 8200402401 do?

The airbag control unit 8200402401 is the central unit of the SRS restraint system in Renault. From the crash sensor signals it determines in an accident, within milliseconds, which airbags and seatbelt pretensioners should trigger.

The unit monitors the operation of the system continuously. It shows faults on the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself.

Why does the control unit 8200402401 fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed. Added to this are ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is stored after the event and cannot be erased with a standard diagnostic tool. Airbag24 takes care of clearing it during the repair.

Ageing components and cold solder joints act over time. Moisture and corrosion at plug connections disrupt the contact.

A further cause of faults is voltage spikes, for example from a weak battery or jump starting.

How can you tell that the 8200402401 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears. The diagnostic tool may not find the control unit. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

A fault memory that cannot be cleared also counts. The warning light is the hint the system gives itself, so have the vehicle checked promptly.

Which vehicles is the 8200402401 fitted in?

The control unit 8200402401 is installed in the following vehicle: Renault Twingo I (1993-2007).

Here is the assignment at a glance:

• Renault Twingo I (1993-2007)

Comparing the part number on the label with this page only ensures that you have removed the right unit. The cause is established only by the fault memory, which you should have read out before removal, because it shows whether the control unit is defective or whether a plug or cable is affected.

For the same vehicles, we also repair control units with the part numbers 550273300, 7700423313A, 7700839010C, 8200018833, 8200018835A, 8200018835B.

How does the repair of the 8200402401 work?

Processing at Airbag24, i.e. checking, repair and function test, usually takes 3–4 working days. Beforehand you read out the fault memory, disconnect the battery, remove the control unit and send it in with a repair order created online.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test.

Enclose the log of the fault memory with the unit. 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 8200402401 get to Airbag24?

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

Place the printed repair order in the parcel and pack the control unit shock-proof.