Airbag control unit with part number 285550178R

What does the airbag control unit 285550178R do?

The airbag control unit 285550178R is the central control unit of the restraint system (SRS) of Renault. It records the crash sensors, assesses an impact within milliseconds and decides which airbags and seatbelt pretensioners are triggered. It reports faults via the airbag warning light.

The manufacturer number Bosch 0285020584 is also printed on the housing.

During operation the unit checks the system continuously. After an accident it stores crash data and locks itself.

Why does the control unit 285550178R fail?

Crash data stored after an accident is the most common cause, even if no airbag was triggered. A normal diagnostic tool does not erase it. Other causes include ageing components, cold solder joints, moisture at plug connections and voltage spikes.

The data in the memory is not evidence of damage to the unit. Airbag24 removes it as part of the repair.

Electronics age, solder joints can go cold, and moisture or corrosion attack plug connections. Voltage spikes, for example from a weak battery or jump-starting, put additional strain on the components.

How can you tell that the 285550178R is defective?

A defect is indicated by the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Fault messages and connection problems with the diagnostic tool are also possible signs.

Pay particular attention to the following signs:

• Airbag warning light on permanently or intermittently
• Fault message in the instrument cluster
• No connection between the diagnostic tool and the control unit
• Fault memory that cannot be cleared

In an emergency, a defect may mean that the airbags and seatbelt pretensioners do not trigger. An inspection should therefore take place promptly.

In which vehicles is the 285550178R fitted?

The control unit 285550178R is fitted in these vehicles: Renault Arkana I (from 2019).

The list of vehicles for this part number:

• Renault Arkana I (from 2019)

Comparing the part number with the label on the removed unit confirms that it is the correct unit. Whether the control unit itself is defective is shown only by the fault memory read out beforehand, because it distinguishes the unit from a plug or cable as the cause.

For the same vehicles, we also repair control units with the part numbers 285015832, 285A40674R, 285A49105R, 5D3EEF4828, 985103085R.

How does the repair of the 285550178R work?

Have the fault memory read out first and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Create the repair order online and pack the unit well for dispatch. At Airbag24 processing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the crash data and carries out a function test. Your own unit then comes 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 285550178R get to Airbag24?

You send the control unit as a parcel or book a UPS collection for an extra charge. Airbag24 handles the return after the repair by UPS.

The printed repair order belongs in the parcel; the unit should be packed shock-proof.