Airbag control unit with part number 985108027R

What is the function of the airbag control unit 985108027R?

The airbag control unit with part number 985108027R is the central control module for the occupant restraint system. It processes signals from acceleration sensors to deploy airbags and seatbelt pretensioners in the event of a collision. Internally, it stores operational and event data—such as crash data—in non-volatile memory (EEPROM/Flash).

Technically, the module is based on a microcontroller‑controlled circuit board populated with various electronic components, including MOSFETs, voltage regulators, and specialized ICs. These components manage the ignition circuits of pyrotechnic charges and continuously monitor the overall functionality of the airbag system.

This control unit is used, among other applications, in the Fiat Talento of the 296 series and is also known in the market under reference number A2C17353504. Proper operation is essential for vehicle safety.

Why does the control unit 985108027R fail?

The most common cause of malfunction in the 985108027R control unit is the permanent storage of crash data after an accident. Other defects are purely electronic, such as burnt components on the circuit board, faulty memory chips (EEPROM corruption), or cold solder joints, especially in BGA components.

After an airbag deployment, a permanent fault entry is recorded in the control unit’s memory, effectively locking the system. This “crash lock” prevents further use even if the hardware itself remains undamaged. Simply clearing the fault memory via a diagnostic tool is not possible in this case.

Electronic component failures can occur spontaneously due to aging or external factors like moisture (water damage) and voltage fluctuations in the vehicle’s electrical system. These issues lead to internal errors that also trigger the airbag warning light and disable the system.

How do you recognize a defect in the airbag control unit 985108027R?

A defect in the 985108027R control unit primarily manifests as a permanently illuminated airbag warning light on the instrument cluster. Often, the control unit can no longer be accessed via a diagnostic tool (“no communication”), or it reports an internal, non‑erasable error code indicating a hardware or memory failure.

The most noticeable sign is the airbag warning lamp that fails to turn off after starting the engine. This indicates a serious issue within the restraint system that requires immediate inspection, as the protective function may no longer be guaranteed in the event of a crash.

In the workshop, the defect often becomes apparent when access to the fault memory is denied or when a permanent entry such as “control unit internal error” or “crash event stored” is present. These errors cannot be cleared using conventional diagnostic tools.

In which vehicles is the control unit 985108027R installed?

At Airbag24, the control unit with part number 985108027R is professionally repaired for the Fiat Talento of the 296 series. This model was produced roughly between 2016 and 2021. The repair service also covers units with the alternative reference number A2C17353504.

Specifically, this control unit can be found in the following models and series:

Fiat Talento 296 (approximately model years 2016–2021)

How is the control unit 985108027R professionally repaired?

The repair of the 985108027R control unit at Airbag24 involves a comprehensive analysis and targeted restoration. Upon receipt, crash data is first removed from the internal EEPROM memory. This is followed by a thorough inspection, with defective electronic components replaced as needed. A final test ensures full functionality.

After submission to Airbag24, the control unit undergoes a standardized process. An initial visual inspection for external damage, such as corrosion or signs of fire, is the first step. This is followed by electrical measurements and a communication test on a dedicated test bench.

The core repair, depending on the nature of the fault, involves resetting crash data or repairing the hardware. Defective components like resistors, capacitors, or MOSFETs are replaced at the component level, and cold solder joints are re-soldered. Firmware integrity is also verified during the process.

As this is a safety‑critical component, all repairs are performed exclusively by qualified electronics technicians. You receive 2 years’ statutory liability for defects on the completed work.