Airbag control unit with part number 985104843R

What does the airbag control unit 985104843R do?

As the central unit, the airbag control unit 985104843R controls the restraint system (SRS) for Renault. It processes the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident, it stores crash data and locks itself.

Faults identified during monitoring are shown via the airbag warning light in the instrument cluster, so you will be aware of them.

The control unit works not only in accidents but also in everyday use, long before any accident happens.

Why does the control unit 985104843R fail?

The most common cause is crash data stored in the unit 985104843R after an accident, even if no airbag has deployed. Other causes are aged components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

These causes can be considered in detail:

• Crash data stored after an accident, even without airbag deployment. A normal diagnostic tool cannot erase it.
• aged electronic components
• cold solder joints
• moisture and corrosion on plug connectors
• voltage spikes, for example from a weak battery or a jump-start

Which of these points applies in an individual case only becomes clear from the evaluation of the fault memory.

How can you tell that the 985104843R is defective?

The airbag warning light signals the defect on the 985104843R when it lights up permanently or intermittently. Error messages in the instrument cluster accompany it, the diagnostic tool cannot find the control unit, and a fault memory cannot be cleared.

While the light is on, airbags and seatbelt pretensioners may not deploy in an emergency. This also applies when the vehicle can be driven unremarkably in everyday use.

The diagnostic tool is indispensable for narrowing down the cause, because without a connection the cause remains open.

Which vehicles is the 985104843R fitted in?

The unit 985104843R is fitted in this vehicle: Renault Trafic III (from 2014).

Here is the comparison by vehicle:

• Renault Trafic III (from 2014)

Comparing the part number from the label of the removed unit with this page only confirms the identity of the unit. It says nothing about the cause of the failure. Therefore, first have the fault memory read out to see whether the control unit itself is affected or whether a plug or a cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 608 36 16 00 C, 8200 969 856-95160, 985104418R, 985106142R, 985109244R--B, A2C80862803.

How does the repair of the 985104843R work?

The first step is reading out the fault memory; you enclose the log with the unit. Once the battery is disconnected, the control unit 985104843R can be removed. You then create a repair order online and pack the unit carefully before sending it in. Airbag24 usually schedules 3–4 working days for testing, repair and function test.

The sequence protects during work on the system. Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test.

The unit then returns 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 985104843R get to Airbag24?

A parcel, or a UPS collection booked for an extra charge, brings the control unit 985104843R to Airbag24. The return after the repair follows by UPS.

The printed repair order goes into the parcel. Wrap the unit shock-proof before it goes out.