Airbag control unit with part number 8201030307

What does the airbag control unit 8201030307 do?

The airbag control unit 8201030307 is the central control unit of the restraint system (SRS) for Renault. It evaluates the crash sensor signals and decides in an accident within a few milliseconds which airbags and seatbelt pretensioners are triggered.

The unit also monitors the system continuously and indicates faults via the airbag warning light. After an accident it stores crash data and locks itself.

Why does the control unit 8201030307 fail?

The most common cause is crash data that remains stored after an accident, even if no airbag was triggered. Other causes include aged electronic 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 erased with a normal diagnostic tool. The control unit therefore stays in a fault state if nothing else has changed.

Electronic components age with the vehicle. Solder joints can go cold, and moisture or corrosion attack the plug contacts.

Voltage spikes occur above all when the battery is weak or the vehicle is started with a jump start. This load hits the electronics directly.

How can you tell that the 8201030307 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, through a fault message in the instrument cluster and through a diagnostic tool without connection to the control unit. In addition, the fault memory cannot be erased. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The light in the instrument cluster is the most visible sign. It reports the fault as soon as the system detects it, which is a clear reason to have it checked.

A diagnostic tool without a connection to the control unit also indicates a problem in the system.

Which vehicles is the 8201030307 fitted in?

The airbag control unit 8201030307 is fitted in this vehicle: Renault Twingo III (2014-2024).

The list below names the vehicles that are known for this unit.

• Renault Twingo III (2014-2024)

(a) A comparison of the part number on the label with this page confirms that it is the right unit. (b) Have the fault memory read out beforehand. Only this 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 402787B3, 8200 491 652, 8200018833, 8201030303, 985100858R, 985101180R.

How does the repair of the 8201030307 work?

First have the fault memory read out and enclose the report. Then disconnect the battery and only then remove the control unit 8201030307. Create the repair order online, and send the unit in well packed. Processing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and replaces faulty components. Stored crash data is erased, followed by a function test. Afterwards your own unit is returned 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 8201030307 get to Airbag24?

You send the control unit 8201030307 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel, and pack the unit shock-proof.