Airbag control unit with part number 985108564R

What is the function of the airbag control unit 985108564R?

The airbag control unit with part number 985108564R is the central control module of the passive safety system in the Renault Kadjar I (model years 2015–2022). It processes data from acceleration and crash sensors to precisely deploy the airbags and seatbelt pretensioners at the right moment in the event of a collision.

As the “brain” of the restraint system, this module makes split-second decisions to activate protective mechanisms. It continuously monitors all connected components—such as sensors, airbag igniters, and seatbelt pretensioners—for proper functionality. A fault-free unit is therefore critical for occupant safety and the correct operation of the entire airbag system.

Why does the control unit 985108564R fail? Common causes

The most common cause of failure for the control unit 985108564R is the storage of crash data after an accident, which locks the device. Other reasons include internal electronic component defects, moisture damage, or secondary damage resulting from improper repair attempts.

After a collision in which airbags or seatbelt pretensioners have deployed, the control unit self‑locks for safety reasons. The internal memory stores so‑called “crash data,” preventing further operation. This condition is comparable to error codes such as B1000 or B107F and cannot be cleared by standard workshop diagnostics.

In addition, hardware defects on the circuit board can also be responsible. Faulty circuits, processors, or memory chips may lead to total failure or malfunctions. Such internal failures often result from aging, thermal stress, or vibrations experienced during driving.

It is important to note the exact part number. Similar control units, such as those found under part number 985107024R, may be installed in related models but are not directly interchangeable.

How do you recognize a defect in the airbag control unit 985108564R?

The clearest symptom is a permanently illuminated airbag warning light on the dashboard that does not turn off even after starting the engine. Often, the control unit can no longer be read by a diagnostic tool (no communication), or display messages such as “Refer to the manual” appear.

Another clear indication is when a diagnostic tool cannot establish communication with the airbag control unit. In such cases, the workshop cannot retrieve any error codes, suggesting a serious internal malfunction of the module.

Following an accident, the control unit remains locked—even if no further error codes can be read. The airbag warning light stays on because stored crash data prevents reactivation of the system.

In rarer cases, defects may manifest through unusual symptoms also observed in related control units. These include a malfunctioning speedometer or error messages mistakenly indicating faulty wheel sensors.

Before removal, a specialized workshop should clearly attribute the fault to the control unit. Including a diagnostic report with the shipment significantly speeds up analysis and repair.

In which vehicles is the control unit 985108564R installed?

The airbag control unit with part number 985108564R is specifically designed for the first-generation Renault Kadjar (Type I), produced between model years 2015 and 2022. Repair is the most cost-effective solution for this model.

At Airbag24, we repair part number 985108564R for the following model:

Renault Kadjar I (2015–2022)

What are the benefits of repairing the 985108564R?

The key advantage of repair is substantial cost savings compared to a new unit, which often exceeds €500. Moreover, the refurbished original control unit is immediately ready for use (plug-and-play) and requires no time-consuming re‑coding at an authorized dealer.

While used parts can offer a more affordable alternative, they carry risks such as unknown histories or lack of warranty. In contrast, professional repair restores full functionality and is backed by 2 years’ statutory liability for defects.

How does repair work at Airbag24?

After sending the removed control unit to Airbag24, our technicians perform a comprehensive analysis. The repair process includes erasing crash data, replacing defective electronic components with genuine parts, and conducting a final functional test. The unit is thoroughly inspected and returned with 2 years’ statutory liability for defects.

The process begins with the professional removal of the unit at your workshop. The device is then shipped to us securely packaged. At Airbag24, the control unit is first inspected using state-of-the-art diagnostic equipment to pinpoint the exact cause of the fault.

Repair is carried out at the component level. Defective parts, such as circuit boards or memory chips, are replaced with new genuine components. If crash data has been stored, it is completely and safely erased. Where technically required and specified by the manufacturer, the device’s software is also updated. Each repair is documented with a test report.