Airbag control unit with part number 985100566R

What does the airbag control unit 985100566R do?

The airbag control unit 985100566R carries out the evaluation of the restraint system (SRS) in Renault. From the signals of the crash sensors it calculates, within milliseconds in an accident, which airbags and seatbelt pretensioners are triggered. It also monitors the system continuously and reports faults via the airbag warning light.

Monitoring runs as long as the ignition is on and covers the sensors, the wiring and the triggers.

After an accident, the unit stores crash data and locks itself. The lock is only lifted by the repair.

Why does the control unit 985100566R fail?

Crash data stored after an accident is the most common cause for the 985100566R, even if no airbag was triggered. Other causes are ageing components, dry solder joints, moisture and corrosion on plug connections, and voltage spikes.

These causes come into consideration in detail:

• ageing electronic components
• dry solder joints
• moisture and corrosion on plug connections
• voltage spikes, for example from a weak battery or jump-starting

Crash data cannot be deleted with an ordinary diagnostic tool. At Airbag24 it is deleted.

How can you tell that the 985100566R is defective?

The airbag warning light lights up permanently or intermittently in the instrument cluster. A fault message appears, the diagnostic tool finds no connection to the control unit of the 985100566R, and the fault memory cannot be cleared.

In the event of a defect, the airbag warning light is a clear sign that airbags and seatbelt pretensioners may not trigger in an emergency.

A timely check of the system is therefore advisable.

Which vehicles is the 985100566R fitted in?

The comparison of vehicles shows whether your own car is affected. The control unit 985100566R is fitted in these vehicles: Renault Twingo III (2014-2024).

For this part number, we list these vehicles:

• Renault Twingo III (2014-2024)

First compare the part number on the label of the removed unit with this page; that only clarifies whether it is the right unit. Have the fault memory read beforehand, because only that log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 402787B3, 985100858R, 985101168R, 985101180R, 985101322R, 985101808R.

How does the repair of the 985100566R work?

Processing at Airbag24 takes 3–4 working days for the 985100566R. First have the fault memory read and attach the log; then disconnect the battery and only then remove the control unit. Afterwards, create the repair order online and send the unit in, well packed.

On the test bench, Airbag24 examines the unit, repairs defective components, deletes the stored crash data and carries out a function test. Your own unit is then sent 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 985100566R get to Airbag24?

Sending in the 985100566R is done as a parcel, or with a UPS collection that you book for an extra charge. UPS returns the unit to you after the repair.

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