Airbag control unit with part number 985100580R

What does the airbag control unit 985100580R do?

The airbag control unit 985100580R is responsible for the restraint system (SRS) of Renault. In an accident it evaluates the crash sensors, decides on airbags and seatbelt pretensioners within milliseconds, and monitors the system continuously. Faults appear via the airbag warning light, and after an accident the unit stores crash data and locks itself.

While driving, the control unit checks sensors, lines and its own control. It records deviations in the fault memory.

The task is therefore twofold: the unit monitors permanently and acts only in an emergency.

Why does the control unit 985100580R fail?

Stored crash data is the most common cause, even if no airbag has triggered; a normal diagnostic tool cannot delete it. Further causes in brief:

Besides the crash data, these causes are possible:

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

Crash data are already created by an impact that does not trigger an airbag, and they remain in the unit as an entry. The other points act over time, for example when temperature changes or vibration briefly interrupt a connection.

How can you tell that the 985100580R is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, an error message appears, the diagnostic tool finds no connection to the control unit, or the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then fail to trigger in an emergency.

The warning light is the indicator to watch for. It shows the fault and must not be ignored, even if the vehicle keeps running.

The fault memory shows whether the message originates from the control unit itself or from another source.

Which vehicles is the 985100580R fitted in?

The control unit 985100580R is fitted in these vehicles: Renault Koleos II (from 2016).

The vehicles for this part number at a glance:

• Renault Koleos II (from 2016)

Compare the part number on the label of the removed unit with this page; that only confirms that the correct unit is at hand. Have the fault memory read out beforehand, because only that result shows whether the control unit is defective or a plug 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 985100580R work?

First have the fault memory read out and attach the log, then disconnect the battery and only after that remove the control unit. Then create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. The unit then goes back to you.

Removal, packing and shipping are your responsibility. Testing, repair and function test are handled by 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 985100580R get to Airbag24?

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

Put the printed repair order in the parcel. Pack the unit shock-proof.