Airbag control unit with part number 985101942R

What does the airbag control unit 985101942R do?

The control unit 985101942R is the airbag control unit of the restraint system (SRS) in the Renault. It processes the crash sensor signals, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

It indicates faults via the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself.

Why does the control unit 985101942R fail?

The most common cause is stored crash data after an accident, even if no airbag was triggered; a normal diagnostic tool cannot erase it. Other causes are also possible.

The crash data remains stored, regardless of whether an airbag was triggered.

• aged electronic components
• cold solder joints
• moisture and corrosion on plug connections
• voltage spikes, for example from jump-starting

How can you tell that the 985101942R is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which lights up constantly or intermittently, through an error message, and through a missing connection to the diagnostic tool. In a crash, the airbags and seatbelt pretensioners may then fail to trigger.

The warning light is the clearest sign, because the system itself indicates that it has detected a fault. A look at it after switching on the ignition is therefore worthwhile.

If the fault memory persists despite everything, the cause does not necessarily lie in the control unit, as connectors and cables can also be responsible.

Which vehicles is the 985101942R fitted in?

The control unit 985101942R is fitted in these vehicles: Renault Twingo III (2014-2024).

These models are on record for this part number:

• Renault Twingo III (2014-2024)

Matching the part number on the label of the removed unit with this page only confirms that it is the right unit. Have the fault memory read out beforehand; it shows whether the control unit is defective or whether a connector 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 985101942R work?

Before you remove the control unit, have the fault memory read out and attach the log. Then disconnect the battery and remove the unit; next, create a repair order online and send it in well packed. At Airbag24, checking, repairing and testing usually takes 3–4 working days.

The sequence is fixed for safety reasons; removal only begins after the battery has been disconnected.

At Airbag24 the unit is checked, defective components are replaced, crash data is erased and a function test is carried out. Afterwards your own unit is returned to you.

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 985101942R get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. The return shipment after the repair is made by UPS.

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