Airbag control unit with part number UD70499

What is the function of the airbag control unit UD70499?

The airbag control unit with part number UD70499 is the central control module for the occupant protection system in the Bentley Brooklands. It continuously analyzes data from the acceleration and yaw rate sensors to precisely and rapidly deploy the airbags and seatbelt pretensioners in the event of a crash.

As a core component of passive vehicle safety, this control unit is responsible for detecting collisions and activating the appropriate restraint systems. It communicates with all relevant sensors in the vehicle to ensure reliable operation.

In Bentley vehicles, control units from renowned manufacturers such as Bosch, Delphi, or Continental are commonly installed. The UD70499 is specifically tailored to the architecture of the Bentley Brooklands and is essential for its safety systems.

Why does the airbag control unit UD70499 fail?

The most common cause of failure for the UD70499 control unit is the storage of crash data after an accident, which results in the device being internally locked. Other causes include electronic malfunctions, water damage, faulty wiring or connector issues, as well as internal errors that trigger fault codes such as B1060 or B1111.

Following a collision—even one involving low impact energy—the control unit irrevocably writes crash data into its internal memory. This lockout is a manufacturer‑imposed safety measure designed to prevent the reuse of a potentially damaged unit; however, it can be reset through professional repair.

Electronic malfunctions can also lead to failure. Internal faults within the control unit, such as error code B1060, indicate a problem with the software or firmware. Error code B1111 signals a general internal defect in the control unit itself.

External factors—such as water ingress through leaks in the vehicle or physical damage to wiring and connectors, especially beneath the seats—are also well‑known sources of failure that can impair functionality.

How do you recognize a defect in the UD70499?

A defect in the airbag control unit UD70499 typically manifests as a permanently illuminated or flashing airbag warning light (SRS lamp) on the instrument cluster. Often, communication with a diagnostic tool becomes impossible, or specific fault codes like B1111 or B1060 are read out.

The most noticeable sign is the active SRS warning light that fails to extinguish after the engine starts. This indicates a critical fault in the restraint system, meaning the airbags would not deploy in an emergency.

Another clear symptom is when a workshop cannot establish communication with the airbag control unit using a diagnostic device. The unit does not respond to queries, suggesting a severe internal malfunction or total failure.

If fault codes such as B1111 (control unit defective) or B1060 (software/firmware issue) are stored in the fault memory, this directly points to a malfunction of the control unit itself, requiring inspection and repair.

In which vehicles is the UD70499 installed?

The airbag control unit with part number UD70499 is specifically designed for vehicles of the Bentley brand. It is primarily used in the luxurious Brooklands coupes, necessitating specialized repair expertise for these exclusive models.

At Airbag24, the UD70499 control unit is professionally repaired for the following models mapped in our database:

Bentley: Brooklands 1st Generation (model years 2008–2011), Brooklands Mk2

How does the repair of the UD70499 work?

The repair of the UD70499 at Airbag24 focuses on eliminating the root cause of the fault, particularly resetting the stored crash data after an accident. Upon submission, the unit is thoroughly analyzed, internal defects are corrected, full functionality is restored, and a final test is performed.

The process begins with the proper removal of the control unit from the vehicle, often located in the center console. The unit is then securely packaged and shipped to Airbag24.

At our workshop, a detailed diagnosis takes place. Technicians extract the stored crash data and restore the control unit to its factory settings. If additional electronic or software-related faults are present, they are also professionally resolved.

Following successful repair and a conclusive functional test, the control unit is returned. After installation, it is fully operational again, and the fault memory in the vehicle can be cleared. We provide 2 years' statutory liability for defects on every repair.

What are the benefits of a repair?

The main advantage of repairing the UD70499 is the significant cost savings compared to an expensive new part, which can cost up to 750 euros. Additionally, the original control unit remains intact, avoiding potential issues with vehicle coding that may arise when using used replacement parts.

A repair is the most economical solution to restore full safety to your airbag system. According to market analyses, the cost of a new OEM part often ranges from 400 to 750 euros.

Since the vehicle-specific original part is repaired, there’s no need for time-consuming re-coding or reprogramming—tasks frequently required when using a used control unit from another vehicle and which add extra effort.

With 2 years’ statutory liability for defects on the completed repair, you receive a reliable, safe solution that fully restores the airbag system’s functionality.