Airbag control unit with part number 985101028R

What does the airbag control unit 985101028R do?

The airbag control unit 985101028R is the central control unit of the restraint system (SRS) for Renault. It evaluates the signals from the crash sensors, decides in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system constantly. After an accident it locks itself; this lock is lifted only by the repair.

It stores events and faults in the fault memory. This makes it possible to trace the cause of a fault in the workshop.

The airbag warning light in the instrument cluster shows the driver when the system has detected a fault.

Why does the control unit 985101028R fail?

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

Crash data are stored after an accident and cannot be removed with an ordinary reading tool. Whether an airbag was triggered plays no role for this entry.

Aged electronic components and cold solder joints are typical weak points. Moisture and corrosion at plug connections act over time, and voltage spikes attack the electronics directly.

How can you tell that the 985101028R is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared.

A warning light that stays on permanently is the clearest sign. Intermittent lighting also means the system has detected a fault, even if the display goes out again afterwards.

If the connection to the diagnostic tool fails, or the fault memory stays full even after an attempt to clear it, the control unit may be affected. Airbags and seatbelt pretensioners may then fail to deploy in an emergency. A prompt check is therefore sensible.

In welchen Fahrzeugen ist das 985101028R verbaut?

The control unit 985101028R is fitted in these vehicles: Renault Arkana I (from 2019).

The matching vehicles are listed in this overview:

• Renault Arkana I (from 2019)

Comparing the part number on the label of the removed unit with this page ensures that it is the right unit. This does not clarify the cause. Have the fault memory read out beforehand: only this log shows whether the control unit itself is defective or whether a connector 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 985101028R work?

You first read out the fault memory and enclose the log. Then disconnect the battery and only then remove the control unit 985101028R. Next, create the repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards your own unit goes back 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 985101028R get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends your own unit back by UPS.

Enclose the printed repair order and pack the unit shock-proof.