Airbag control unit with part number 985104729R

What does the airbag control unit 985104729R do?

The airbag control unit 985104729R is the central control unit of the restraint system (SRS) at Renault. It evaluates crash sensors and decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered. Once an accident has occurred, it stores crash data and locks itself.

The system is checked continuously by the unit, and faults appear via the airbag warning light in the instrument cluster.

Only a repair ends this lock.

Why does the control unit 985104729R fail?

For the control unit 985104729R, the most common cause after an accident is stored crash data, even if no airbag has triggered. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A standard diagnostic tool cannot erase this crash data. The entry therefore remains in the memory until it is removed during a repair.

Electronic components age over time, and moisture can attack plug connections. Cold solder joints are a further possible weak point that only shows up on closer inspection.

Voltage spikes arise, for example, from a weak battery or from jump-starting. Which cause applies in an individual case is shown only by the inspection of the unit.

How can you tell that the 985104729R is defective?

A defect in the 985104729R becomes noticeable at the airbag warning light in the instrument cluster, which stays on permanently or intermittently. Added to this are an error message in the instrument cluster, a missing connection between the diagnostic tool and the control unit, or a fault memory that cannot be cleared.

If the warning light stays on, airbags and seatbelt pretensioners may not trigger in an emergency. Therefore have the indication checked promptly.

In which vehicles is the 985104729R fitted?

The airbag control unit 985104729R is fitted in these vehicles: Renault Arkana I (from 2019).

The suitable vehicles are listed here:

• Renault Arkana I (from 2019)

Separate steps make sense here. (a) Comparing the part number on the label of the removed unit with this page only confirms that it is the correct unit. (b) Having the fault memory read out beforehand shows whether the control unit 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 985104729R work?

For the Renault, first read out the fault memory and enclose the log. Then disconnect the battery, remove the control unit, create a repair order online and send the unit in well packed. Work at Airbag24 usually takes 3–4 working days.

The log belongs with the unit so that the finding is available during the inspection.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. The own unit then 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 985104729R get to Airbag24?

You send the control unit 985104729R as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

The printed repair order goes into the parcel, and the unit is packed shock-proof.