Airbag control unit with part number 985101180R

What is the function of the airbag control unit 985101180R?

The airbag control unit with part number 985101180R is the central control module for the occupant protection system in various Renault models. As an original Renault replacement part (OE), it processes signals from crash sensors and is responsible for precisely and promptly deploying airbags and seatbelt pretensioners in the event of a collision.

Technically, the device continuously collects and analyzes data from acceleration and angular velocity sensors distributed throughout the vehicle. If it detects a collision exceeding predefined thresholds, it sends critical ignition pulses to the appropriate restraint systems, such as front, side, or head airbags.

This specific control unit, also known under the Renault article number EP6484915, is an integral component of passive vehicle safety and ensures the proper functioning of the entire airbag system.

Why does the control unit 985101180R fail?

The most common cause of failure for the control unit 985101180R is the storage of crash data after an accident, which results in an intentional functional lockout. Other reasons include internal electronic defects in circuit board components or physical damage, such as moisture ingress (water damage).

After an accident in which airbags or seatbelt pretensioners have deployed, the control unit permanently writes crash data into its internal memory. This lockout serves safety purposes and prevents further use until the unit is professionally reset or replaced.

Electronic malfunctions can also lead to complete failure. These often involve faulty solder joints, defective capacitors, or issues with memory chips on the circuit board, causing internal errors and communication breakdowns.

Another frequently overlooked cause is water damage. Intruding moisture can lead to corrosion on the circuit board, resulting in short circuits and irreparable damage to sensitive electronic components. It’s also important to note that this component is listed under reference number 8200018833.

How do you recognize a defect in the 985101180R?

A defect in the airbag control unit 985101180R typically manifests as a permanently illuminated airbag warning light on the instrument cluster. Additionally, the control unit may become unresponsive when connected to a diagnostic tool, displaying specific error codes such as “Crash data stored” or “Control unit internally defective.”

The clearest indication for the driver is the airbag indicator light (SRS light) that fails to turn off after starting the engine. This signals a malfunction in the safety system and requires immediate inspection at a specialized workshop.

During diagnostics at the workshop, the defect often becomes apparent through a complete loss of communication. The diagnostic tool cannot establish a connection with the airbag control unit, making it impossible to read error codes or live data.

If error codes are readable, entries like “Crash data stored,” “Control unit defective,” or “Internal error” directly point to a problem within the control unit itself. These messages confirm that the issue lies not with the sensors or airbags, but with the central module.

In which vehicles is the control unit 985101180R installed?

The control unit 985101180R is primarily used as an original part in Renault vehicles. Its main applications include the Renault Twingo III (from 2014 onward), the Renault Clio IV (2012–2020), and the sporty Renault Twingo RS II. Airbag24 offers professional repair services for this component.

At Airbag24, we repair part number 985101180R for the following models:

Renault Twingo III (model years 2014–2024): This control unit is found in numerous engine variants of type AH, including the 0.9 TCe engines with 90 hp (66 kW), 92 hp (68 kW), and 109 hp (80 kW), as well as the 1.0 SCe engines with 65 hp (48 kW), 69 hp (51 kW), 71 hp (52 kW), and 73 hp (54 kW).

Renault Clio IV (model years 2012–2020): The control unit is also installed in this widely popular model series.

Renault Twingo RS II: Compatibility extends to this sporty version of the Twingo as well.

How does the repair of the 985101180R proceed at Airbag24?

At Airbag24, the repair of the control unit 985101180R follows a certified process. This includes an initial analysis, professional elimination of the root cause—whether clearing crash data or repairing electronics—and a final functionality test. We provide 2 years' statutory liability for defects on every repair.

Upon receipt, the control unit undergoes a thorough diagnosis. Our technicians read the internal fault memory and inspect the circuit board for visible damage such as corrosion or defective components.

The core of the repair process is to address the specific source of the fault. For stored crash data, the memory is professionally reset. In cases of electronic defects, affected components such as capacitors, processors, or solder joints are expertly repaired or replaced.

Following successful repair, each control unit undergoes a comprehensive functional test on a dedicated test bench. This ensures that communication has been restored and all safety‑critical functions operate flawlessly before the unit is returned to you.