Airbag control unit with part number 285557417R

What does the airbag control unit 285557417R do?

The airbag control unit 285557417R coordinates the restraint system (SRS) in Renault vehicles. It processes the readings from the crash sensors, decides in an emergency within a moment which airbags and seatbelt pretensioners fire, and monitors the entire system during operation.

The monitoring covers sensors, firing circuits, seatbelt pretensioners and the wiring between them. If the unit detects a fault, it records an entry in the fault memory and switches on the airbag warning light.

After an accident, it stores crash data and locks itself. The housing also carries the manufacturer's number Bosch 0285015300, which helps with matching.

Why does the control unit 285557417R fail?

Stored crash data is the most common cause of failure: after an accident it remains in the unit, even if no airbag was triggered. A normal diagnostic tool cannot remove it.

The problem often only shows up at the workshop, because the vehicle drives inconspicuously. An accident may lie far in the past, and the entries are still there.

In addition, there are causes related to age and environment: electronic components age, solder joints can go cold, moisture and corrosion attack plug connections, and voltage spikes, for example from a weak battery or a jump start, stress the electronics.

How can you tell that the 285557417R is defective?

The airbag warning light in the instrument cluster stays on permanently or comes on only intermittently, accompanied by a fault message. Often the diagnostic tool additionally fails to connect to the control unit, and the fault memory cannot be cleared.

If the control unit fails, airbags and seatbelt pretensioners may not trigger in an emergency. For that reason, a permanent or recurring warning light should never be ignored, even if the vehicle appears to run normally.

Where the problem comes from cannot be reliably determined without reading out the fault memory, because cables and plugs can show the same symptoms.

Which vehicles is the 285557417R fitted in?

The part number 285557417R belongs to vehicles in which this control unit is fitted: Renault Arkana I (from 2019).

The overview lists the vehicles recorded so far for this part number.

• Renault Arkana I (from 2019)

Before removal, check the fault memory. Only if it shows a fault pointing to the control unit is it certain that a plug or cable is not the cause. Then compare the part number on the label of the removed unit with this page.

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

How does the repair of the 285557417R work?

Before removal, read out the fault memory and attach the log. Then disconnect the battery, remove the control unit, create a repair order online and send the unit in, well packed. Airbag24 inspects it on the test bench, repairs defective components, erases stored crash data and tests the function before your own unit is sent back.

The repair takes place at Airbag24, not in the vehicle. Inspecting, repairing and testing at Airbag24 normally takes 3–4 working days.

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 285557417R get to Airbag24?

You send the unit to Airbag24 as a parcel or book a UPS collection. After the repair, Airbag24 returns control unit 285557417R to you by UPS.

Include the printed repair order with the parcel and pack the unit shock-resistant so that nothing arrives damaged.