Airbag control unit with part number 8200307804

What does the airbag control unit 8200307804 do?

The airbag control unit 8200307804 coordinates the SRS restraint system of Renault. It reads the signals from the crash sensors, determines within milliseconds in an impact which airbags and seatbelt pretensioners fire, and checks the system constantly for faults.

If the system reports a fault, the airbag warning light in the instrument cluster lights up. In an accident the unit also stores crash data and then locks itself.

The control unit is thus the point where all threads of the restraint system come together. Without its evaluation the restraint system cannot work reliably.

Why does the control unit 8200307804 fail?

Most often the cause is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot erase it. Aged components, cold solder joints, moisture or corrosion in plug connections, and voltage spikes, for example from a weak battery or a jump start, are also possible.

The stored data remain in the unit until they are erased. A fault can therefore occur even when nothing can be seen on the vehicle from outside.

Aged components and damp contacts impair function over a longer period. Voltage spikes additionally stress the electronics and occur mainly when the power supply is weakening.

How can you tell that the 8200307804 is defective?

A defect shows itself when the airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears, the diagnostic tool cannot establish a connection to the control unit, or the fault memory cannot be erased.

While the light is on, airbags and seatbelt pretensioners may possibly fail to trigger in an emergency. This applies regardless of how the vehicle behaves in everyday use.

The warning light is there to make a defect visible as soon as the system detects it. Even when the vehicle drives normally, an entry may already be stored in the memory, which is why reading out the fault memory belongs to every diagnosis.

Which vehicles is the 8200307804 fitted in?

The 8200307804 is fitted in these vehicles: Renault Mégane II (2002-2009).

The models are listed individually below:

• Renault Mégane II (2002-2009)

Two points help with the assignment. Compare the part number on the label of the removed unit with this page, and you know that it is the right unit. Have the fault memory read out before removal; only this result shows whether the control unit itself is defective or whether a plug or cable is the cause.

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 8200307804 work?

First have the fault memory read out and enclose the log; only then disconnect the battery and remove the control unit. Airbag24 checks the unit, repairs it and erases the crash data; processing there usually takes 3–4 working days.

Then create a repair order online and pack the unit well before sending it.

At the test bench Airbag24 examines the unit. Defective components are repaired, stored crash data are erased, and a function test follows. After that 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 8200307804 get to Airbag24?

You send the unit in as a parcel or arrange a UPS collection for an extra charge. After the repair UPS brings it from Airbag24 back to you.

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