Airbag control unit with part number 550805300

What does the airbag control unit 550805300 do?

The airbag control unit 550805300 manages the restraint system (SRS) of Renault. It processes the crash sensor data, decides in an accident within milliseconds which airbags and seatbelt pretensioners to trigger, and monitors the system permanently.

It shows faults via the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself.

The sensors supply their values to the control unit without pause, so it can assess the condition continuously.

Why does the control unit 550805300 fail?

The most common cause is crash data from an accident that is stored even when no airbag has triggered. A normal diagnostic tool cannot erase it. Aged components, cold solder joints, moisture, corrosion and voltage spikes are also possible causes.

Airbag24 erases the crash data during the repair. This step is firmly built into the process.

Voltage spikes can be caused, for example, by a weak battery or by jump-starting. Moisture and corrosion attack connectors, and aged electronics change their behaviour over time.

How can you tell that the 550805300 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

Airbags and seatbelt pretensioners may then possibly not trigger in an emergency. Therefore, have the warning checked promptly.

Which vehicles is the 550805300 fitted in?

The control unit 550805300 is fitted in these vehicles: Renault Twingo I (1993-2007).

The vehicle we have on record for this unit is shown here:

• Renault Twingo I (1993-2007)

Comparing the part number on the label of the removed unit with this page shows whether it is the correct unit. Whether the control unit is defective or a connector or cable is the cause only shows in the fault memory, which you should have read out beforehand.

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 550805300 work?

First have the fault memory read and attach the log, then disconnect the battery and only then remove the control unit. Online, you create a repair order; then send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Afterwards your own unit comes 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 550805300 get to Airbag24?

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

Enclose the printed repair order and pack the control unit shock-proof.