Airbag control unit with part number 985106190R

What is the function of the Airbag Control Unit 985106190R?

The Airbag Control Unit 985106190R is the central control module for the passive safety system in Dacia Duster I models. It processes signals from crash sensors to deploy airbags and seatbelt pretensioners in the event of a collision, thereby protecting occupants. Repair is possible in cases of electronic malfunctions or stored crash data.

As the heart of the restraint system—also known as the Airbag Control Unit (ACU)—part number 985106190R continuously monitors all connected components. These include impact sensors located at the front and sides of the vehicle, the airbags themselves, the seatbelt pretensioners, and the seat occupancy detection system.

In the event of a collision, the internal processor analyzes sensor data within milliseconds. If deceleration values exceed a predefined threshold, the control unit sends ignition pulses to the appropriate pyrotechnic charges in the airbags and seatbelt pretensioners, activating them precisely when needed.

Why does the Control Unit 985106190R fail?

The most common causes of failure for the Control Unit 985106190R are internally stored crash data following an accident, which can lock the system, as well as hardware defects in electronic components. These include faulty microcontrollers, capacitors, or damaged CAN‑bus interfaces that lead to communication issues.

A major cause of malfunction is the storage of crash data. After an airbag deployment, the control unit locks itself for safety reasons. This lock cannot be reset using standard diagnostic tools at a workshop and requires specialized electronic repair.

Additionally, internal electronic faults may occur. Overvoltage in the vehicle’s electrical system, aging, or moisture can damage components such as capacitors, processors, or the CAN‑bus interface, resulting in internal errors often logged in the fault memory as error code 65535 or 93F9 (commonly seen in similar Renault/Dacia systems).

The control unit is also known by manufacturer part number A2C85841702 and is technically related to systems like 985102122R from the Renault/Dacia platform, which exhibit similar failure patterns.

How do you recognize a defect in the 985106190R?

A defect in the Control Unit 985106190R primarily manifests as a permanently illuminated airbag warning light on the instrument cluster. Other clear indicators include loss of communication with diagnostic equipment and the absence of safety functions, such as fuel pump shutdown after a crash.

The most obvious symptom is the airbag warning light that fails to turn off after the engine starts. This indicates a critical fault in the restraint system that compromises airbag functionality.

Another clear sign is when a workshop’s diagnostic tool cannot establish communication with the airbag control unit. The module does not respond to requests, making it impossible to read the fault memory and pointing to a severe internal hardware failure.

In some cases, secondary errors may also appear. For example, the fuel shut-off valve indicator might illuminate because the control unit no longer properly releases fuel flow after an accident.

In which vehicles is the Control Unit 985106190R installed?

The Airbag Control Unit with part number 985106190R is specifically designed for the first generation of the Dacia Duster. At Airbag24, we repair this module for all model years from 2010 to 2018, including facelifted versions and all trim levels such as Access, Ambiance, Laureate, and Prestige.

Repair services at Airbag24 cover the following Dacia models and series:

Dacia Duster I (model years 2010–2013)

Dacia Duster I Facelift (model years 2013–2018)

Dacia Duster Access I, Ambiance I, Laureate I, Prestige I

How is the Control Unit 985106190R professionally repaired?

At Airbag24, the control unit undergoes a standardized repair process. This includes an initial inspection, electronic troubleshooting through clearing crash data or replacing defective components, and a final functional test. We provide 2 years' statutory liability for defects on every repair.

Once the removed control unit arrives at Airbag24, a precise diagnosis is performed to identify the exact source of the fault. Technicians check communication links and read out internal error codes.

The actual repair takes place at the component level. Stored crash data is erased from the unit’s memory. In cases of hardware defects, damaged parts such as microcontrollers, capacitors, or CAN transceivers are replaced using professional soldering techniques.

Subsequently, the control unit undergoes a comprehensive functional test. This ensures that communication has been restored and that all internal system checks pass without error. The repaired unit can then be reinstalled in the vehicle using a plug-and-play process.

What are the benefits of repairing 985106190R?

The primary advantage of repair is the significant cost savings compared to purchasing a new original part, which often costs several times as much. Additionally, the vehicle’s original coding is preserved, eliminating the need for time-consuming reprogramming and ensuring compatibility. Repair also represents a sustainable solution.

From a financial perspective, repair is the most economical option. While new parts, such as those offered by Dacia, are considerably more expensive, refurbishment provides an affordable yet fully functional alternative.

A key technical benefit is the preservation of the original coding. Since the vehicle’s own control unit is repaired, there is no need to reprogram a new module into the vehicle. Once installed, the unit is immediately ready for use (plug-and-play).

Each repair comes with 2 years' statutory liability for defects, underscoring the quality and durability of the work performed.