Airbag control unit with part number 985109354R

What is the function of the airbag control unit 985109354R?

The airbag control unit with part number 985109354R serves as the central control module of the airbag system in certain Dacia models. Its core task is to process sensor signals in order to deploy the airbags and seatbelt pretensioners precisely and promptly in the event of a crash. It is an essential component for occupant safety.

As the brain of the passive safety system, the control unit 985109354R continuously monitors all connected components. These include the various crash sensors distributed throughout the vehicle, as well as the ignition pyrotechnic devices of the airbags and seatbelt pretensioners.

In the event of a collision, the module analyzes incoming data within milliseconds and determines which restraint systems need to be activated. This precise control ensures optimal protection for vehicle occupants and is therefore an indispensable part of vehicle safety.

Why does the control unit 985109354R fail?

The most common causes of failure for the control unit 985109354R are stored crash data following an accident, which locks the device. Other reasons include electronic malfunctions in internal components or damage caused by water ingress. A typical error code read during diagnostics is B1000.

After a crash, so-called crash data is stored in the control unit’s memory. This data permanently disables the module’s functionality to prevent unintended re‑activation. Repair is essential in such cases to restore system safety.

Electronic malfunctions can arise from aging components or voltage spikes in the vehicle’s electrical system. Corrosion caused by moisture ingress (water damage) can also harm the sensitive electronics on the circuit board, leading to total failure.

For similar Dacia models, there are related part numbers such as 985105409R, 985109184R, and 985105129R, which perform comparable functions and may exhibit similar defects.

How do you recognize a defect in the 985109354R?

The clearest symptom of a defect in the airbag control unit 985109354R is the airbag warning light that remains constantly illuminated on the instrument cluster. This indicates an active fault in the restraint system. During workshop diagnostics, the error code B1000 is often read, directly pointing to a problem.

The airbag warning light typically stays on even after the engine starts and does not extinguish as usual after the system check. This is a clear sign that the airbag system is not operational and would not deploy in the event of a crash.

Another technical symptom is the absence or disruption of communication between the diagnostic tool and the airbag control unit. If the module no longer responds to diagnostic requests, this suggests a serious internal defect.

In which Dacia models is 985109354R installed?

At Airbag24, we repair the control unit 985109354R specifically for certain variants of the Dacia Dokker. It is primarily used in the first generation of the Dokker, including the Dokker Van I and Dokker Express I models produced between 2012 and 2021.

The control unit is explicitly designed for the following vehicle configurations and mapped in our system:

Dacia Dokker I (2012–2021), Dacia Dokker Van I, and Dacia Dokker Express I. Compatibility is particularly confirmed for models such as the Dacia Dokker Estate (KE_) 1.5 dCi (KEAJ, KEAH).

Technically, it is specially engineered for vehicles equipped with diesel engine codes K9K 626 and K9K 612 paired with a 5-speed manual transmission.

How is the control unit 985109354R professionally repaired?

At Airbag24, repairs follow a standardized procedure. First, an analysis is conducted of the data stored in the control unit and its hardware. Depending on the cause, crash data is erased, electronic fault sources are eliminated, and the device is restored to factory settings. We provide 2 years' statutory liability for defects on every repair.

After submitting the removed control unit, technicians inspect it. If the issue involves stored crash data, this data is safely deleted using specialized equipment. This process restores full functionality without requiring an expensive new part.

If an electronic defect is present, the circuit board is analyzed to identify the faulty component and replace it properly. Following restoration, the control unit undergoes a final test to ensure it communicates flawlessly with the vehicle again and performs all functions correctly.