Airbag control unit with part number 985105744R

What does the airbag control unit 985105744R do?

The airbag control unit 985105744R forms the switching centre of the restraint system (SRS) for Renault. It processes the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

The unit also monitors the entire system continuously. If it detects a fault, the airbag warning light in the instrument cluster shows this.

After an accident the control unit stores crash data and locks itself. Nothing more is said about this here.

Why does the control unit 985105744R fail?

One cause is crash data stored after an accident, even if no airbag has fired, and a diagnostic tool in everyday use cannot erase it. Other possible causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from a weak battery or jump-starting.

The crash data stays in memory until it is removed during repair. The unit creates it as soon as the sensors register an event, not only when an airbag actually fires.

The other causes tend to develop gradually. Moisture and corrosion attack contacts, and solder joints can loosen over time.

How can you tell that the 985105744R is defective?

A defect shows when the airbag warning light in the instrument cluster lights up permanently or intermittently. A fault message in the instrument cluster, a lack of connection from the diagnostic tool to the control unit, or a fault memory that cannot be erased also indicate one.

If the defect persists, airbags and seatbelt pretensioners may not trigger in an emergency. You should therefore treat the light as a prompt to have the system looked after.

Many drivers get used to the warning light and overlook it. When starting the engine, check whether the light goes out, because a permanent light is an unmistakable sign.

Which vehicles is the 985105744R fitted in?

According to our current data, this allocation applies to Renault. The airbag control unit 985105744R is fitted in these vehicles: Renault Koleos II (from 2016).

Below you will find the vehicles stored in our data for this part number.

• Renault Koleos II (from 2016)

Two things help you with the allocation. First, compare the part number on the label of the removed unit with this page; this only confirms the identity of the unit. Second, have the fault memory read, because only this result shows whether the control unit itself or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 985105619R, 985106952R.

How does the repair of the 985105744R work?

First have the fault memory read and enclose the log with the unit. Then disconnect the battery and remove the control unit. Next create a repair order online and send in the unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 examines the unit on the test bench and repairs defective components. Stored crash data is erased, and a function test follows, after which your own unit is returned.

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 985105744R get to Airbag24?

You send the unit to us as a parcel, or you book a UPS collection for an extra charge. After the repair, UPS brings the unit back to you.

Put the printed repair order into the parcel and pack the control unit shock-proof.