Airbag control unit with part number 985109380R

What does the airbag control unit 985109380R do?

The airbag control unit 985109380R is the central unit of the restraint system (SRS) for Renault. It evaluates the signals from the crash sensors and, in a collision, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

It monitors the system continuously and shows faults via the airbag warning light in the instrument cluster. The manufacturer number Bosch 0285015297 is additionally printed on the housing.

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

Why does the control unit 985109380R fail?

Crash data stored after an accident is the most common cause with 985109380R, even if no airbag has deployed. Ageing electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also involved.

A normal diagnostic tool cannot delete the crash data. It remains stored until Airbag24 removes it during the repair.

The remaining causes affect the electronics and their power supply. Aged components and cold solder joints disrupt operation, moisture and corrosion damage the contacts, and voltage spikes can arise from a weak battery or jump-starting.

How can you tell that the 985109380R is defective?

A defect in the 985109380R shows up through the airbag warning light, which stays on permanently or intermittently. A fault message appears alongside it in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The airbag warning light reports a fault in the restraint system directly to the driver. A light that stays on should be checked promptly.

The diagnosis starts with reading out the fault memory, so that the cause can be narrowed down.

Which vehicles is the 985109380R fitted in?

The airbag control unit 985109380R is intended for Renault and is fitted in these vehicles: Renault Arkana I (from 2019).

The vehicles are listed individually here:

• Renault Arkana I (from 2019)

Compare the part number on the label of the removed unit with this page; this only confirms that it is the correct unit. Have the fault memory read out before removing anything, because only that 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 285015832, 285A40674R, 285A49105R, 5D3EEF4828, 985103085R.

How does the repair of the 985109380R work?

You have the fault memory read out, the log goes with the unit, you disconnect the battery and only then remove the control unit 985109380R. At Airbag24, checking, repair and function testing usually take 3–4 working days.

Then create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, replaces defective components where necessary, deletes the stored crash data and carries out a function test.

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 985109380R get to Airbag24?

You send the control unit 985109380R to Airbag24 as a parcel, or book a UPS collection for an extra charge. After the repair, it comes back to you by UPS.

The printed repair order goes into the parcel, and the unit must be packed shockproof.