Airbag control unit with part number 985101757R

What does the airbag control unit 985101757R do?

The airbag control unit 985101757R is the central control unit of the restraint system (SRS) in Renault vehicles. It processes the measurements of several sensors, decides in a crash within milliseconds which airbags and seatbelt pretensioners fire, and constantly checks the system for faults.

Faults are shown via the airbag warning light.

If an accident occurs, it stores crash data and locks itself.

Why does the control unit 985101757R fail?

The most common cause on the 985101757R is crash data stored after an accident, even if no airbag was deployed; a standard diagnostic tool cannot erase it. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

Whether an airbag was deployed plays no role in the storage.

Aged components and cold solder joints only become noticeable under load. Moisture and corrosion attack the plug contacts.

Voltage spikes from the vehicle electrical system also affect the electronics.

How can you tell that the 985101757R is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently as soon as the 985101757R has a defect. An error message accompanies it, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In that case airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light shows the defect directly; no diagnostic tool is needed for this.

If the light stays on permanently or an error message appears, have the system checked promptly.

Which vehicles is the 985101757R fitted in?

The 985101757R is fitted in these vehicles: Renault Koleos II (from 2016). Compare your model with this information before removal.

The following models are known to us for this part number:

• Renault Koleos II (from 2016)

Comparing the part number on the unit with this page only confirms the identity of the unit. Whether the control unit is defective or whether a plug or cable is the cause is only shown by the fault memory read out beforehand.

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

How does the repair of the 985101757R work?

For the 985101757R, the fault memory comes first: have it read out and enclose the log. Then disconnect the battery, and only after that remove the control unit. Send it in with a repair order. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and performs a function test. You then receive your own unit back.

These 3–4 working days only concern the work at Airbag24. 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 985101757R get to Airbag24?

Either you send the control unit 985101757R as a parcel, or you book a UPS collection for an extra charge. Airbag24 returns the unit to you by UPS after the repair.

Pack the printed repair order into the parcel, and use shock-resistant packaging for the unit.