Airbag control unit with part number 985105129R

What is the function of the airbag control unit 985105129R?

The airbag control unit 985105129R is the central control module for the passive safety system in numerous Dacia models, especially the Duster. It processes data from crash sensors and is responsible for precisely and reliably deploying airbags and seatbelt pretensioners in the event of a collision.

This original Dacia component continuously monitors the vehicle’s condition via various sensors. It identifies the severity and direction of an impact to activate only the necessary restraint systems.

This precise activation effectively protects occupants while minimizing unnecessary repair costs. Therefore, the proper functioning of this unit is crucial for vehicle safety.

What defects occur in the control unit 985105129R?

The most common reason for repairing the control unit 985105129R is the storage of crash data after an accident. This data permanently disables the unit’s functionality. Additionally, underlying electronic faults can also lead to failure, often indicated by the airbag warning light.

Following a collision, the control unit irrevocably writes crash information into its internal memory. This safety mechanism locks the device to prevent reuse without professional diagnostics. The primary repair method is therefore the targeted deletion of this crash data.

In rarer cases, internal component failures may also cause malfunctions. For newer Dacia Duster III models, part number 985108185R is also mentioned as an alternative OEM part number, indicating a technical evolution of the hardware.

How do you recognize a defect in the 985105129R?

The clearest sign of a defect in the airbag control unit 985105129R is a continuously or intermittently illuminated airbag warning light on the instrument panel. This indicates that the safety system is not fully operational and that one or more fault codes are stored in the unit.

The red airbag warning light, often depicted as a pictogram of a seated passenger with an airbag, normally extinguishes shortly after starting the vehicle. If it remains lit, this directly points to a system error.

A vehicle with a persistently lit airbag warning light would fail the main inspection (HU). A workshop can use a diagnostic tool to read the fault codes stored in the control unit and confirm the defect.

In which vehicles is the 985105129R installed?

The control unit 985105129R is primarily used across a wide range of Dacia vehicles. This includes various generations and trim levels of the Dacia Duster, Dokker, Logan, as well as future models such as the Bigster and several older series.

At Airbag24, we repair part number 985105129R for the following Dacia models and series:

Dacia Duster: Duster I (2010–2018, including facelift), Duster III (from 2024), along with the Access II, Ambiance I and II, Laureate I, and Prestige I and II trims.

Other Dacia models: Dokker I (2012–2021), Bigster I (from 2025), Logan, as well as historic models like 1410 I, 1210 I, 1000 I, 1304 I, 1320 I, Drop Side I, 1310 CN I, and 1410 Sport I.

How is the control unit 985105129R professionally repaired?

At Airbag24, the repair of the control unit 985105129R follows a standardized process. After an initial inspection, specialized technicians erase the stored crash data. This is followed by a comprehensive functional test to ensure full operability. We provide 2 years' statutory liability for defects on every repair.

Upon receipt at Airbag24, the control unit undergoes a thorough fault diagnosis. The core of the repair lies in professionally resetting the crash data, thereby restoring factory‑level functionality.

This approach, backed by 20 years of experience and over 20,000 repairs performed, offers a proven alternative to costly new purchases. Final tests guarantee that, once reinstalled, the unit communicates flawlessly with the vehicle.