Airbag control unit with part number 985107887R

What is the function of the airbag control unit 985107887R?

The airbag control unit with part number 985107887R is the central control module of the passive safety system in Renault vehicles. Its primary task is to monitor all relevant sensors, such as acceleration sensors and seatbelt pretensioners, evaluate data in real time, and precisely deploy airbags and other restraint systems in the event of a crash.

As a Renault airbag control unit (SRS control unit), it is specifically designed for the vehicle architecture of the Renault Clio V. It continuously processes signals from the vehicle and, within milliseconds, determines whether a collision has occurred and which safety components need to be activated to provide optimal protection for occupants.

After an activation event, the unit permanently stores crash information for later analysis; however, this also locks another function of the system until proper repair is performed.

Why does the control unit 985107887R fail?

The most common cause of failure for the 985107887R control unit is the permanent storage of crash data in its internal memory (EEPROM/Flash) after a collision. This data cannot be erased using standard diagnostic tools, effectively locking the system. Another major reason is internal hardware defects on the circuit board, such as issues at solder joints, traces, or the internal power supply.

A typical repair case is the so‑called “crash reset.” After a collision—even if no airbags deployed—an irreversible entry is written into the control unit’s memory. This entry locks the entire airbag system and causes the warning light to remain illuminated permanently. The repair involves electronically erasing this data and restoring the unit to a factory‑like state.

In addition, defects in individual electronic components—such as microcontrollers, memory ICs, or driver modules—can lead to total failure. These faults often manifest as the error code “internal fault” and require component‑level repairs.

In rarer cases, voltage spikes or moisture can cause corrosion or damage to protective circuits. A faulty or missing Vehicle Identification Number (VIN) entry in memory can also disable the control unit.

How do you recognize a defect in the 985107887R?

A defect in the airbag control unit 985107887R typically manifests clearly through the permanently illuminated airbag warning light (SRS light) on the instrument cluster. Additionally, the fault memory may contain entries like “airbag control unit defective” or “internal fault,” which cannot be cleared. In some cases, communication with the control unit via a diagnostic tool becomes impossible.

The most obvious sign is the active airbag warning light that fails to turn off after starting the engine. This indicates that the entire passive safety system is disabled, which constitutes a significant defect during a mandatory technical inspection (HU).

Another clear symptom is a workshop’s inability to erase stored crash data following accident repairs. The system remains locked even though all external components, such as airbags and seatbelt pretensioners, have been replaced.

In certain situations, the control unit becomes inaccessible to diagnostic equipment. It does not respond to queries via the OBD interface, complicating troubleshooting and often pointing directly to an internal fault within the device.

Important: Before removing the control unit, a specialized workshop must verify that the root cause of the issue does not lie in external components, such as sensors, the seat occupancy mat, or the seatbelt pretensioners.

In which models is the control unit 985107887R installed?

The airbag control unit with part number 985107887R is primarily found in Renault vehicles. It is specifically used in the current generation of the Renault Clio and covers various model variants.

At Airbag24, we repair the 985107887R part number for the following models:

Renault Clio V (from model year 2019 onward)

Renault Clio RS V

What are the advantages of repairing the 985107887R?

Repairing the original control unit offers substantial cost savings—often 60–80% compared to purchasing a new OEM part. Since the vehicle’s original unit is refurbished, its original coding and configuration are preserved, eliminating the need for time‑consuming reprogramming at the workshop. Moreover, repair represents a sustainable solution that conserves valuable electronic resources.

A key advantage is maintaining the vehicle’s original coding. A new part often requires complex programming tailored to the specific vehicle configuration. In contrast, a repaired unit retains its original settings, allowing it to be installed and immediately operational (plug-and-play).

The cost savings are significant. While a new control unit entails high purchase costs, electronic repair or crash reset is a far more economical alternative, without compromising safety.

By reusing the existing unit, electrical waste is avoided, helping to protect the environment. It’s the more environmentally responsible choice compared to replacing and disposing of the defective component.

How does the repair process work at Airbag24?

The repair process begins with the proper removal of the control unit in your workshop. After sending it to Airbag24, our technicians perform a detailed analysis. Depending on the fault pattern, crash data is erased or internal hardware defects are repaired. Following a final functional test, the repaired unit is returned ready for installation.

First, locate the control unit 985107887R in the vehicle—typically in the center tunnel area of the Clio V—and remove it with the battery disconnected. Along with a description of the fault, send it to Airbag24.

In the lab, an initial inspection is carried out. Next, the internal memory (EEPROM/Flash) is read to erase crash data or diagnose internal faults. For hardware defects, faulty components on the circuit board are professionally replaced.

After successful restoration, the control unit undergoes a comprehensive functional test on a specialized test bench that simulates real‑world driving conditions. Only after passing this test is it approved for return shipment.

Once reinstalled in the vehicle, you simply need to clear the fault memory. Airbag24 provides 2 years' statutory liability for defects on every repair.