Airbag control unit with part number 985109084R

What does the airbag control unit 985109084R do?

The airbag control unit 985109084R controls the restraint system (SRS) of Renault. It evaluates the crash sensors, decides in an accident on airbags and seatbelt pretensioners, and indicates faults on the airbag warning light.

Triggering takes place within milliseconds, whereas monitoring runs permanently in the background, including during normal driving.

After an accident, the unit stores crash data and locks itself.

Why does the control unit 985109084R fail?

On the control unit 985109084R, the cause is most often crash data from an accident that the unit has stored, even if no airbag was triggered. Aged components, moist plug connections and voltage spikes are also possible causes.

A standard diagnostic tool cannot access this data. At Airbag24, it is erased as part of the repair.

Other causes at a glance:

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

How can you tell that the 985109084R is defective?

A defect shows through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, through a fault message there, or through the diagnostic tool being unable to establish a connection to the 985109084R. A fault memory that cannot be erased also belongs to this.

The light displays the fault, and as long as it persists, airbags and seatbelt pretensioners may fail to trigger in an emergency. A light that does not go out should therefore be checked promptly.

Which cause lies behind it cannot be determined from the light alone; for that, the fault memory must be read out.

Which vehicles is the 985109084R fitted in?

The control unit 985109084R is fitted in these vehicles: Renault Kadjar I (2015-2022).

Our records list these vehicles:

• Renault Kadjar I (2015-2022)

Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit. Whether the control unit is defective, or whether a plug or a cable is the cause, is shown only by the fault memory read out beforehand.

For the same vehicles, we also repair control units with the part numbers 632199700, 632199700C, 985100781R, 985102271R, 985104870R, 985108564R.

How does the repair of the 985109084R 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 985109084R. Next, create a repair order online and send the unit in well packed; processing at Airbag24 usually takes 3–4 working days.

At the test bench, Airbag24 checks the unit, replaces the defective components, erases the stored crash data and tests the function. Afterwards, you receive your unit 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 985109084R get to Airbag24?

You send the control unit 985109084R as a parcel or book a collection by UPS for an extra charge. After the repair, UPS brings the unit from Airbag24 back to you.

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