Airbag control unit with part number A2C17352803

What is the function of the airbag control unit A2C17352803?

The airbag control unit A2C17352803, also known as the Bosch control unit with OEM number 985100209R, is the central control module for the occupant protection system in the Dacia Duster II. It processes data from crash sensors and, in the event of a collision, decides whether to activate airbags and seatbelt pretensioners to protect vehicle occupants.

As the heart of the passive safety system, this component continuously monitors all connected sensors and actuators. Upon impact, the onboard microcontroller unit (MCU) analyzes signals from the acceleration sensors within milliseconds and, when predefined thresholds are exceeded, deploys the appropriate restraint devices. Precise identification is achieved via the Bosch part number A2C17352803 or the manufacturer-specific OEM number 985100209R.

What defects occur in A2C17352803?

The most common reason for repairing the A2C17352803 control unit is stored crash data following an accident, which locks the system. Other typical defects include internal hardware faults accompanied by the error code “control unit defective,” communication issues over the CAN bus, problems with power supply, or physical damage such as corrosion and broken pins.

After an accident in which airbags or seatbelt pretensioners have deployed, the device permanently stores non-erasable crash or event data in its EEPROM. This results in the airbag warning light remaining constantly illuminated and prevents further system operation. Repair aims to safely erase this data and restore the unit to factory settings, provided there is no severe hardware damage.

Electronic defects on the circuit board are also a frequent cause. These include faulty SMD components, defective capacitors, resistors, or damaged traces. Such failures often lead to internal error codes or complete loss of communication.

External factors like water damage can also cause corrosion at connectors and on the board, impairing functionality. Similarly, overvoltage events in the vehicle’s electrical system may damage the control unit’s sensitive electronics.

How do you recognize a defect in the A2C17352803 control unit?

A defect in the A2C17352803 control unit primarily manifests as a permanently lit or flashing SRS/airbag warning light on the instrument cluster. Additionally, workshops may be unable to establish communication with the airbag control unit using diagnostic equipment. The fault memory often records internal errors such as “control unit defective.”

The most noticeable sign is the persistently illuminated airbag indicator light after starting the engine. This indicates a fault in the restraint system and clearly suggests that the safety systems might not function correctly in an emergency.

Another red flag is when diagnostics at the workshop fail. If the diagnostic tool cannot connect to the airbag control unit, it points to a serious internal defect or a problem with CAN-bus communication.

In some cases, specific error codes are also stored in the fault memory. Entries such as “control unit defective” or errors indicating issues with the supply voltage are typical symptoms requiring closer examination of the unit.

In which vehicles is the A2C17352803 airbag control unit installed?

The A2C17352803 airbag control unit is primarily used in vehicles manufactured by Dacia. At Airbag24, we repair this module specifically for certain models in the Duster series, including the second-generation Dacia Duster and its facelift variant produced during the specified model years.

Specifically, this control unit is found in the following models:

Dacia Duster II (model years 2018–2021)

Dacia Duster II Facelift (model years 2021–2024)

How is the A2C17352803 control unit professionally repaired?

At Airbag24, repairs of the A2C17352803 control unit follow a rigorous process. Following an initial diagnosis and visual inspection, stored crash data is securely erased, and defective electronic components such as resistors or capacitors are replaced. A final functional test ensures full operability before the unit is returned with 2 years' statutory liability for defects.

Upon receipt at Airbag24, each control unit undergoes a detailed incoming and visual inspection. Connectors, pins, and the circuit board are checked for obvious damage, such as corrosion or mechanical impairment.

This is followed by electronic diagnostics, where the fault memory is read out using specialized tools. This allows precise identification of the root cause—whether it’s an internal hardware defect, a communication issue, or stored crash data.

The actual repair, depending on the findings, involves safely erasing crash data, replacing defective SMD components, or restoring damaged circuit traces. Before being returned, each unit undergoes a comprehensive functional test to ensure proper operation. We provide 2 years' statutory liability for defects on every repair performed.