Airbag control unit with part number 985100945R

What does the airbag control unit 985100945R do?

The airbag control unit 985100945R is the central processing unit of the restraint system (SRS) in Renault. It processes the signals from the crash sensors, determines the triggering of airbags and seatbelt pretensioners within milliseconds in the event of an impact, and monitors the system continuously. It reports faults via the airbag warning light.

The unit works in the background throughout every journey. After an accident, it stores crash data and locks itself.

Why does the control unit 985100945R fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot delete it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, for example from a weak battery or a jump start.

The crash data is held in the unit's memory, regardless of how the accident went.

Aged components and cold solder joints lead to intermittent faults, because connections give way over time. Moisture and corrosion weaken the contact at plugs, and voltage spikes can disturb the electronics.

How can you tell that the 985100945R is defective?

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

Typical signs:

• The airbag warning light lights up permanently or intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool cannot establish a connection to the control unit.
• The fault memory cannot be cleared.

If any of these signs occur, the airbags and seatbelt pretensioners may not deploy in an emergency.

Which vehicles is the 985100945R fitted in?

The airbag control unit 985100945R is fitted in these vehicles: Renault Koleos II (from 2016).

The following vehicles are listed for this part number:

• Renault Koleos II (from 2016)

Compare the part number on the label of the removed unit with this page. That only shows that it is the right unit. Also have the fault memory read out before you remove anything, because only the 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 985100945R work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery, and only then remove the control unit. Afterwards create a repair order online and send in the unit.

Airbag24 inspects the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. Processing usually takes 3–4 working days. 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 985100945R get to Airbag24?

You send the unit in as a parcel, or you book a UPS collection for an extra charge. The return to you after the repair is likewise made by UPS.

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