Airbag control unit with part number 8200412038

What does the airbag control unit 8200412038 do?

At Renault, the airbag control unit 8200412038 coordinates the restraint technology (SRS). In an accident it evaluates the signals from the crash sensors and decides within milliseconds which airbags and seatbelt pretensioners are triggered. It also monitors the system continuously and reports faults via the airbag warning light.

While driving, the unit helps check the system. After an accident, it stores crash data and locks itself.

The crash sensors and triggers are connected to the control unit, and it reads their status continuously.

Why does the control unit 8200412038 fail?

The most common cause of failures of the 8200412038 is crash data stored from an accident, even if no airbag was triggered. Aged components, cold solder joints, moisture, corrosion and voltage spikes can also cause a failure.

A normal diagnostic tool does not delete the crash data.

Further causes include:

• electronic components that age over time
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes from a weak battery or a jump start

How can you tell that the 8200412038 is defective?

The airbag warning light in the instrument cluster is the clearest sign of a defect in the 8200412038: it lights up permanently or intermittently. Added to this are an error message in the instrument cluster, a missing connection of the diagnostic tool to the control unit, and a fault memory that cannot be cleared. In that case, airbags and seatbelt pretensioners may not trigger in an emergency.

This warning light is among the first things a driver notices.

Only reading out with the diagnostic tool shows which faults are stored in the memory and whether the unit is affected.

Which vehicles is the 8200412038 fitted in?

For Renault, the control unit 8200412038 is intended. It is fitted in these vehicles: Renault Mégane II (2002-2009).

In our data, these models are on record for this part number:

• Renault Mégane II (2002-2009)

Comparing the part number on the label of the removed unit with this page ensures that you have the correct unit in front of you. Whether it is defective or a plug or cable is the cause is established by the fault memory, which you have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 8200257044E, 8200337245, 8200337247, 8200412026, 8200412026B, 8200682381.

How does the repair of the 8200412038 work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit 8200412038. Afterwards create a repair order online and send in the unit well packed; Airbag24 checks it on the test bench, repairs defective components, deletes stored crash data and carries out a function test, then the return follows. Processing at Airbag24 usually takes 3–4 working days.

The order of steps is fixed for safety reasons.

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 8200412038 get to Airbag24?

You send the control unit 8200412038 as a parcel or book a UPS collection for an extra charge. Airbag24 sends it back to you by UPS after the repair.

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