Airbag control unit with part number 8200340428

What does the airbag control unit 8200340428 do?

The airbag control unit 8200340428 is the control unit of the restraint system (SRS) in Renault. It evaluates the crash sensors, decides in an accident within milliseconds on triggering airbags and seatbelt pretensioners, and reports faults via the airbag warning light.

The unit works in the background and checks the system continuously. If something unusual is detected, it stores the finding in the fault memory, which can later be read with a diagnostic tool.

After an accident it stores crash data and locks itself. This behaviour makes it a sensitive component that must be handled carefully at every intervention.

Why does the control unit 8200340428 fail?

The most common cause with the 8200340428 is crash data stored after an accident, even if no airbag was triggered. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

Crash data held in the control unit cannot be removed with an ordinary diagnostic tool. The fault therefore remains, even if the vehicle shows no external damage.

The other causes relate to the electronics themselves. With increasing age, components lose reliability, and cold solder joints can interrupt connections.

Moisture and corrosion on plugs affect the signals. Voltage spikes, for example from a weak battery or a jump start, additionally stress the circuits.

How can you tell that the 8200340428 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently on a defective 8200340428. In addition an error message appears, the diagnostic tool cannot find the control unit, or the fault memory cannot be cleared.

With these signs, airbags and seatbelt pretensioners may possibly not trigger in an emergency. The warning light is therefore not a cosmetic issue but a sign that the system must be checked.

Which vehicles is the 8200340428 fitted in?

The control unit 8200340428 is fitted in these vehicles: Renault Scénic II (2003-2009); Renault Mégane II (2002-2009); Renault Grand Scénic II (2003-2009).

The list below shows the individual vehicles in which this number occurs.

• Renault Scénic II (2003-2009)
• Renault Mégane II (2002-2009)
• Renault Grand Scénic II (2003-2009)

A label comparison with this page only tells you about the identity of the unit. Whether the control unit itself is defective or whether a plug or cable is the cause is shown by the fault memory read-out carried out beforehand.

For the same vehicles, we also repair control units with the part numbers 603989700, 607993600, 8200257044E, 8200321999, 8200337245, 8200337247.

How does the repair of the 8200340428 work?

Testing, repairing and checking the 8200340428 at Airbag24 usually takes 3–4 working days. Beforehand you have the fault memory read out and the log attached; then you disconnect the battery and remove the unit. Only then do you create a repair order online and send the unit in.

The sequence is binding for safety reasons, without exception.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and then carries out a function test. Your unit is returned to you afterwards.

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 8200340428 get to Airbag24?

You send the control unit 8200340428 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and make sure the packaging is shock-proof.