Airbag control unit with part number 985101808R

What does the airbag control unit 985101808R do?

The SRS control unit 985101808R coordinates the restraint systems of Renault. It checks the sensors continuously, calculates within milliseconds in an impact whether airbags and seatbelt pretensioners are triggered, and shows faults via the airbag warning light.

After an accident, the unit writes crash data to its memory and is then locked. The lock ends only with the repair.

In everyday use, it runs unobtrusively in the background and needs no operation. The connection to sensors and triggers is made by wiring.

Why does the control unit 985101808R fail?

Most often, the cause is crash data from an earlier accident, even if no airbag has deployed, and a standard diagnostic tool cannot erase it. Also to blame can be aged components, cold solder joints, moisture and corrosion at plugs, and voltage spikes, for example from a weak battery or jump-starting.

Crash data is the result of the analysis after an incident. It remains in the unit even when the vehicle is then used normally.

Aged electronics, cold solder joints and penetrating moisture gradually degrade the signal quality. Corrosion at plug connections has the same effect.

Voltage spikes from a weak battery or jump-starting additionally affect the electronics.

How can you tell that the 985101808R is defective?

Typical signs are an airbag warning light that lights up permanently or intermittently, an error message in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared.

• Airbag warning light in the instrument cluster lights up permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

With these signs, airbags and seatbelt pretensioners may possibly fail to deploy in an emergency. Take this warning seriously and have it checked.

Which vehicles is the 985101808R fitted in?

The airbag control unit 985101808R is fitted in these vehicles: Renault Twingo III (2014-2024).

These vehicles are stored in our data for this part number.

• Renault Twingo III (2014-2024)

Compare the part number on the label of the removed unit with this page, and you will know whether it is the right unit. Have the fault memory read out beforehand; only this result 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, 8200 491 652, 8200018833, 8201030303, 985100858R, 985101180R.

How does the repair of the 985101808R work?

First, have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the unit. Next, create the repair order online and send the unit in, well packed.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Afterwards, the unit goes back to you.

Processing at Airbag24 usually takes 3–4 working days. This period covers only the checking, repairing and testing in our workshop.

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 985101808R get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection for an extra charge. After the repair, it comes back to you from Airbag24 by UPS.

The printed repair order goes into the parcel. Make sure the unit is packed shock-proof.