Airbag control unit with part number 985103078R

What does the airbag control unit 985103078R do?

The airbag control unit 985103078R is the central control unit for the restraint system (SRS) on Renault. It checks the crash sensors, selects in an emergency which airbags and seatbelt pretensioners are triggered, and keeps the system under control during continuous operation. Faults appear on the airbag warning light; after an accident, it stores crash data and locks itself.

The unit is central to the protective function, because it controls the triggering. It detects faults in the components and records them in the fault memory.

The system consists of sensors, seatbelt pretensioners and airbags, all of which depend on the control unit. A failure can therefore affect the entire system.

Why does the control unit 985103078R fail?

Crash data stored after an accident are the most common cause with 985103078R, even if no airbag has triggered. A normal diagnostic tool cannot delete them, but Airbag24 deletes them during repair. Other possible causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Whether a component inside the unit is also defective is shown by the fault memory. The crash data say nothing about this.

Aged components and cold solder joints are inside the unit, whereas moisture and corrosion tend to affect the plug connections. Voltage spikes, for example from a weak battery or a jump start, put additional strain on the electronics.

How can you tell that the 985103078R is defective?

If the airbag warning light in the instrument cluster stays on permanently or intermittently, this indicates a warning sign. A fault message in the instrument cluster, a diagnostic tool without access to the control unit 985103078R, or a fault memory that cannot be cleared may also appear. In that case, there is a risk that airbags and seatbelt pretensioners may possibly not deploy in an emergency.

The warning sign alone does not reveal which component is affected. Therefore, have the vehicle checked promptly.

Only reading out the fault memory with a diagnostic tool shows how deep the cause goes. It then becomes clear whether plugs, cables or the control unit are affected.

Which vehicles is the 985103078R fitted in?

The airbag control unit 985103078R is fitted in these vehicles: Renault Mégane III (2008-2016). Anyone comparing the list with their own car can see at once whether the unit fits.

The following vehicles are listed:

• Renault Mégane III (2008-2016)

Comparing the part number on the label of the removed unit with this page only confirms that you have the correct unit. Have the fault memory read out beforehand, as only then does it become clear whether the control unit is defective or 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 985103078R work?

When repairing the 985103078R, you first read out the fault memory, disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the unit, packed well.

You enclose the log of the fault memory with the unit. If you want the crash data deleted, get in touch with Airbag24 briefly before sending the unit in.

Airbag24 checks the unit on the test bench, replaces defective components and runs a functional test. Processing usually takes 3–4 working days. Afterwards, you receive your own, repaired unit back.

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 985103078R get to Airbag24?

You send the control unit 985103078R as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

You place the printed repair order in the parcel and pack the unit shock-resistant.