Airbag control unit with part number 985103789R

What does the airbag control unit 985103789R do?

The airbag control unit 985103789R controls the restraint system (SRS) for Renault and is its central control unit. It evaluates the signals from the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners to trigger, and monitors the system continuously. After an accident, it stores crash data and locks itself.

It reports faults via the airbag warning light in the instrument cluster. This lets you, as the driver, recognise that something is wrong with the restraint system. The lock is only released by the repair. The safety of the occupants therefore depends largely on this control unit.

Why does the control unit 985103789R fail?

Most common cause with the 985103789R: crash data stored after an accident that cannot be erased with a standard diagnostic tool. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The unit also stores crash data when no airbag has deployed. Airbag24 erases them during the repair. These causes are also possible:

• aged 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 985103789R is defective?

A fault in the 985103789R shows up first as the airbag warning light in the instrument cluster, which lights up permanently or intermittently. A fault message in the instrument cluster, a diagnostic tool with no connection to the control unit, or a fault memory that cannot be cleared are also signs.

In an emergency, the airbags and seatbelt pretensioners may then fail to deploy. Have such a finding checked promptly. The underlying cause cannot be determined from these signs alone. Signs of this kind should not be ignored.

Which vehicles is the 985103789R fitted in?

The control unit 985103789R is fitted in this vehicle: Renault Mégane III (2008-2016). To check whether your car is one of them, compare it with the list on this page.

The following vehicles are listed for this part number:

• Renault Mégane III (2008-2016)

Compare the part number on the label of the removed unit with this page so that you can be sure you have the correct unit. Whether the control unit is faulty or a connector or cable is the cause is only shown by the fault memory, which you should have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 285581365R, 8200962388, 985105478R.

How does the repair of the 985103789R work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the 985103789R. Next, create a repair order online and send the unit in, well packed.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a functional test. The functional test checks the unit before it is sent back. Your unit then goes back to you.

Processing at Airbag24 usually takes 3–4 working days. 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 985103789R get to Airbag24?

You send the 985103789R in as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-resistant. Make sure the parcel is securely sealed.