Airbag control unit with part number 285589704R

What does the airbag control unit 285589704R do?

The airbag control unit 285589704R is the central control unit of the restraint system (SRS) for Renault. It analyses the crash sensors and, in the event of an accident, decides within milliseconds whether airbags and seatbelt pretensioners are triggered.

During operation, it monitors the overall system. Any faults found are shown via the airbag warning light in the instrument cluster.

An accident causes crash data to be stored and the unit to lock itself.

Why does the control unit 285589704R fail?

The most common cause for 285589704R is stored crash data from an accident, even if no airbag was triggered. Further possible causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be erased with an ordinary diagnostic tool. Airbag24 erases it during the repair.

The remaining causes affect the electronics and the electrical contact. A weak battery or a jump start can place extra strain on the voltage supply.

How can you tell that the 285589704R is defective?

A fault in the 285589704R shows up when the airbag warning light in the instrument cluster lights up constantly or intermittently. This can be accompanied by a fault message in the instrument cluster, a lack of connection to the diagnostic tool, and a fault memory that cannot be erased.

These are the signs to look out for:

• fault message in the instrument cluster
• no connection between the diagnostic tool and the control unit
• fault memory cannot be erased

In an emergency, airbags and seatbelt pretensioners may fail to deploy. In this case, a prompt check is advisable.

Which vehicles is the 285589704R fitted in?

The control unit 285589704R is found in this vehicle from Renault: Renault Mégane III (2008-2016). This assignment refers to this control unit and its part number.

Here are the vehicles covered by this assignment:

• Renault Mégane III (2008-2016)

Compare the part number on the removed unit with this page. This only confirms that it is the right unit, not whether it is defective. For this reason, have the fault memory read out beforehand, as only the 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 285581365R, 8200962388, 985105478R.

How does the repair of the 285589704R work?

At Airbag24, checking, repairing and testing usually take 3–4 working days. First read out the fault memory and enclose the log, then disconnect the battery and remove the 285589704R. Finally, create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, replaces defective components and carries out a functional test. 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 285589704R get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns the control unit 285589704R to you by UPS.

Put the printed repair order in the parcel and pack the unit securely against impact.