Airbag control unit with part number 285589527R

What does the airbag control unit 285589527R do?

The airbag control unit 285589527R is the central control unit of the SRS in the Renault vehicle. It evaluates the crash sensors, determines within milliseconds on impact which airbags and seatbelt pretensioners are to be triggered, and monitors the restraint system continuously. After an accident, it stores crash data and locks itself.

It indicates detected faults via the airbag warning light in the instrument cluster. The light is the visible sign of the state of the system.

Why does the control unit 285589527R fail?

On the 285589527R, stored crash data is the most common cause, and this also applies to accidents in which no airbag deployed at all. Crash data cannot be deleted with a standard diagnostic tool; Airbag24 deletes it during the repair. In addition, there are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Moisture and corrosion on plug connections in particular lead to contact problems over time. Several of these causes can act together at the same time. Voltage spikes occur, for example, with a weak battery or when connecting jump leads, and put components under strain.

How can you tell that the 285589527R is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently on the 285589527R as soon as a fault is present. A fault message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

As soon as the light is on, have the system checked, because the warning shows exactly this state. A fault message alone can be enough to trigger the check.

The warning light gives no indication of the cause, only of the state of the system.

Which vehicles is the 285589527R fitted in?

The airbag control unit 285589527R is fitted in these vehicles: Renault Mégane III (2008-2016).

Here is the list of vehicles:

• Renault Mégane III (2008-2016)

Compare the number on the label of the removed unit with this page. This ensures that you have the right unit. This only concerns whether the numbers match. Whether the control unit is faulty or a plug connection or cable is the cause will only be shown by the fault memory, which you should have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 285581365R, 8200962388, 985105478R.

How does the repair of the 285589527R work?

First have the fault memory of the 285589527R read out and enclose the log. Then disconnect the battery. Only after that remove the control unit and create a repair order online, and then send in the well-packed unit.

On the test bench, Airbag24 examines the unit, repairs defective components, deletes stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days. Your own unit is then sent 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 285589527R get to Airbag24?

You send the control unit 285589527R as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS. The printed repair order belongs in the parcel, and the unit is packed shockproof.

The packaging also determines how well the unit survives transport. A sturdy parcel with enough padding helps.