Airbag control unit with part number 8200407548

What does the airbag control unit 8200407548 do?

The airbag control unit 8200407548 controls the restraint system (SRS) of Renault. It evaluates the signals from the crash sensors, decides within milliseconds in the event of an accident which airbags and seatbelt pretensioners are to trigger, and monitors the system continuously. After an accident it stores crash data and locks itself.

All connected components of the restraint system are part of the monitoring. If the control unit finds a deviation, it creates a fault entry and reports the fault via the airbag warning light.

In this way, the device forms the link between sensors and triggering. A fault must therefore always be taken seriously.

Why does the control unit 8200407548 fail?

The most common cause for the 8200407548 is crash data stored after an accident, even if no airbag has triggered; a normal diagnostic tool cannot delete it. Other possible 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.

An entry from the crash data therefore remains in the memory, even if everything else works again.

The other causes act over time: ageing, moisture and voltage fluctuations attack the electronics. Which of these applies in an individual case is shown only by examining the removed device.

How can you tell that the 8200407548 is defective?

A defect shows up as the airbag warning light in the instrument cluster lighting up permanently or intermittently, and as a fault message in the instrument cluster. If the diagnostic tool cannot establish a connection to the control unit, or if the fault memory cannot be cleared, that also points to a problem. Airbags and seatbelt pretensioners may then not trigger in an emergency.

Typical signs:

• Airbag warning light is on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool finds no connection to the control unit
• Fault memory cannot be cleared

A warning light alone does not reveal which component is affected. For that, the fault memory must be read out.

Which vehicles is the 8200407548 fitted in?

The airbag control unit 8200407548 is fitted in these vehicles: Renault Scénic II (2003-2009); Renault Mégane II (2002-2009); Renault Grand Scénic II (2003-2009). To see whether your vehicle is included, check the vehicle documents.

The affected vehicles are listed one below the other here:

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

Firstly, compare the part number on the label of the removed device with this page. This only confirms that it is the right device. Secondly, have the fault memory read out in advance. Only its content shows whether the control unit itself is defective or whether a connector or a cable is the cause.

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 8200407548 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit 8200407548. Then create a repair order online and send the well-packed device in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the device on the test bench, repairs defective components, deletes the stored crash data and carries out a function test. Your own, repaired device is then returned to you.

The time limit refers solely to checking, repairing and testing at Airbag24.

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 8200407548 get to Airbag24?

You send the control unit 8200407548 in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order into the parcel and pack the device shockproof.