Airbag control unit with part number 985106546R

What does the airbag control unit 985106546R do?

The airbag control unit 985106546R controls the restraint system (SRS) in Renault. It checks the crash sensors, selects within milliseconds the airbags and seatbelt pretensioners that should be triggered in an accident, and monitors the system continuously. After an accident, it stores crash data and locks itself.

It reports faults via the airbag warning light in the instrument cluster. Monitoring carries on without a break for as long as the vehicle is under power.

Why does the control unit 985106546R fail?

With the 985106546R, stored crash data is the most common cause as soon as something stays stored in the unit after an accident, even without an airbag being triggered. A standard diagnostic tool cannot delete the crash data; 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 affects the contacts over time, and corrosion further degrades the connection. Voltage spikes occur, for example, with a weak battery or when jump-starting, and put the electronics under load.

How can you tell that the 985106546R is defective?

A fault on the 985106546R shows up in the airbag warning light, which stays on permanently or intermittently. In addition, there is a fault message in the instrument cluster, no connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

• The warning light stays on or flickers at intervals.
• A message relating to the airbag system appears in the instrument cluster.
• A diagnostic tool cannot establish a connection to the control unit.
• Stored faults cannot be removed from the memory.

A fault does not always show up clearly: sometimes the light is on constantly, sometimes only intermittently. That is exactly why a check is worthwhile at the first sign of it.

Which vehicles is the 985106546R fitted in?

The control unit 985106546R is fitted in these vehicles: Renault Mégane III (2008-2016).

The assignment at a glance:

• Renault Mégane III (2008-2016)

Comparing the number on the label of the removed unit with this page shows whether the two numbers match; this only ensures that it is the right unit. Whether it is really faulty or a connector or cable is causing the fault will be clarified by the fault memory that you 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 985106546R work?

First have the fault memory of the 985106546R read out and enclose the log. Then disconnect the battery and remove the control unit. Create the repair order online, and the well-packed unit goes to Airbag24. Processing there usually takes 3–4 working days.

Airbag24 examines the unit on the test bench, repairs defective components, deletes stored crash data and carries out a function 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 985106546R get to Airbag24?

The control unit 985106546R reaches Airbag24 by parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS. Pack the unit shockproof and enclose the printed repair order.

A shockproof box protects the unit in transit.