Airbag control unit with part number 985107593R

What is the function of the airbag control unit 985107593R?

The airbag control unit with part number 985107593R is the central control module of the passive safety system (SRS) in the Renault Zoe II. It processes signals from crash sensors and determines whether to deploy airbags and seatbelt pretensioners, thereby providing optimal protection for occupants in the event of a collision.

As an SRS module (Supplemental Restraint System), it continuously monitors all connected components of the restraint system, including front and side airbags, seatbelt pretensioners, and their associated acceleration and pressure sensors. Its primary task is to rapidly analyze accident scenarios and activate the relevant safety components.

In addition, the control unit stores all system-relevant data, including fault codes and, in the event of a crash, crash data. This information is crucial for vehicle diagnostics after an incident.

Why does the control unit 985107593R fail?

The most common cause of failure for the control unit 985107593R is the permanent storage of crash data following an accident. Other causes include internal electronic faults, such as memory errors (EEPROM/Flash), power supply issues, or aging SMD components and defective solder joints.

After a crash, specific crash data records are permanently stored in the control unit’s internal memory—a manufacturer‑imposed safety measure. The unit locks itself, and the airbag warning light remains illuminated even if the fault code is cleared using a standard diagnostic tool. An electronic repair via a crash reset is therefore essential.

Internal electronic defects are another frequent cause of failure. These may affect the power supply, individual driver ICs, or the processor environment. Such faults often arise due to aging, vibrations, or voltage spikes in the vehicle’s electrical system, leading to internal control unit malfunctions that also trigger the airbag warning light.

In rarer cases, software or configuration errors—such as those occurring after a battery replacement or improper intervention—can also result in malfunctions. However, in most instances, the root cause lies at the hardware level, either in stored data or defective components.

How can you recognize a defect in the control unit 985107593R?

The primary symptom of a defect in the control unit 985107593R is the persistently illuminated airbag warning light on the instrument cluster. Often, the fault code stored in the error memory—such as “crash data saved” or “internal control unit error”—cannot be cleared using a diagnostic tool.

Following a crash, the continuously lit airbag warning light is a clear indication that crash data remains stored in the control unit. In this state, the system is disabled and offers no protection in the event of another accident.

Another sign is when the diagnostic tool displays specific fault codes directly pointing to an internal defect within the module. These include errors related to the power supply, memory (EEPROM/Flash), or general communication issues with the SRS control unit.

In which models is the 985107593R installed?

The airbag control unit with part number 985107593R is specifically installed in vehicles manufactured by Renault. At Airbag24, we repair this module for Renault Zoe II models typically produced from the 2019 facelift onward.

Repair services for this control unit are available for the following vehicle models:

Renault: Zoe II (model years 2019–2024), particularly the R110 (80 kW) and R135 (100 kW) variants.

How is the 985107593R repaired?

The repair process begins with removing the control unit from the vehicle. After sending it to Airbag24, the internal memory is read, crash data is erased (crash reset), and any electronic defects at the component level are addressed. Finally, a functional test is conducted on a test bench.

First, a specialized workshop must read out the fault code and confirm that the issue lies within the control unit itself. Before removal, the vehicle battery must be disconnected, and a waiting period observed. In the Renault Zoe, the control unit is typically located in the center tunnel area.

At Airbag24, electronic repairs follow a certified procedure. Specialized technicians directly access the memory chips (EEPROM/Flash) to completely and safely erase crash data. If internal defects are diagnosed, faulty original SMD or IC components are replaced with new, equivalent parts.

Following repair, the control unit undergoes testing on a dedicated test bench under simulated driving conditions. This ensures seamless communication and full functionality. We provide 2 years' statutory liability for defects on every repair.