Airbag control unit with part number 985102057R

What is the function of the airbag control unit 985102057R?

The airbag control unit with part number 985102057R is the central control module for the passive safety system in the Renault Talisman I (model years 2015–2022). It is designed as an original Renault OEM part and is compatible with numbers 985104204R, 985109088R, and 985109519R. Its primary task is to process sensor data for crash detection and activate the restraint systems.

In the event of a collision, the control unit processes signals from acceleration and pressure sensors within milliseconds. Based on this data, it determines whether and which airbags (driver, passenger, side, head) and seatbelt pretensioners need to be deployed to provide optimal occupant protection.

After deployment, the unit permanently stores accident-related data—known as “crash data.” This storage ensures safety by preventing the reuse of a potentially compromised system.

Why does the control unit 985102057R fail?

The most common cause of failure for the 985102057R control unit is stored crash data following an accident, which prevents further use. In addition, specific internal, systemic, or electrical faults may occur; in the Renault Talisman I, these are often indicated by fault codes V010 (systematic defect) or V007 (electrical/systemic defect) in the diagnostic memory.

Following an accident where airbags or seatbelt pretensioners have been activated, the control unit locks itself internally. This lock cannot be reset using standard diagnostic tools at a workshop and requires specialized repair involving the deletion (reset) of crash data at the chip level.

Independently of accidents, electronic components inside the unit can also fail, leading to internal malfunctions that disrupt communication with the vehicle or trigger persistent error messages. Such defects are often exacerbated by aging electronics or external factors like moisture.

How do you recognize a fault in the 985102057R?

A defective airbag control unit 985102057R typically manifests as a continuously illuminated or flashing airbag warning light on the instrument cluster. Additional signs include loss of communication with the diagnostic tool or the reading of specific fault codes V010 and V007, indicating an internal malfunction in the Renault Talisman I’s control unit.

The most obvious symptom is the airbag warning light that fails to extinguish after turning on the ignition. Sometimes it only lights up about 30 seconds after starting the engine or flashes in a specific pattern.

Another clear indication is when the workshop’s diagnostic equipment cannot establish a connection with the airbag control unit. The unit no longer responds to queries, making accurate fault diagnosis impossible.

Subtle electrical phenomena may also appear, such as a faint glow on the indicator lamp when locking the vehicle or the engine check light flashing in conjunction with the airbag error.

It is crucial to have the control unit inspected after every accident, even if no warning light is active. Only then can the full functionality of the safety system be ensured for the future.

In which vehicles is the control unit 985102057R installed?

The airbag control unit with part number 985102057R, along with its compatible variants 985104204R, 985109088R, and 985109519R, is specifically designed for the Renault Talisman I. Airbag24 offers professional repair services for this control unit, which is used across all engine types and trim levels of this model series from 2015 to 2022.

At Airbag24, we repair part number 985102057R and its compatible counterparts for the following model:

Renault: Talisman I (model years 2015–2022)

How does the repair process work at Airbag24?

After sending the original, unopened 985102057R control unit to Airbag24, our technicians perform a thorough analysis. The repair includes professionally resetting the stored crash data and replacing any faulty electronic components with genuine parts. We provide 2 years' statutory liability for defects on all repairs performed.

The process begins with the customer securely shipping the removed control unit. It is important not to open the device yourself to avoid further damage.

At Airbag24, the unit is first diagnosed to confirm the exact cause of the fault. Subsequently, the crash data is erased (reset) from the memory chips using specialized hardware and software.

If additional hardware defects are detected—such as those caused by moisture or improper prior repairs—our technicians will expertly replace the affected components with original‑equipment‑manufacturer‑quality parts.

Following successful repair, the control unit undergoes a final test to ensure full functionality.