Airbag control unit with part number 285015024

What is the function of Airbag Control Unit 285015024?

The airbag control unit with part number 285015024, also known as 0285015024, A2479001709, or 0285 015 024, is a module manufactured by Bosch for the Mercedes-Benz Sprinter (W907/W910 from 2018 onwards). It serves as the central control unit of the occupant protection system, processing signals from crash sensors and coordinating the deployment of airbags and seatbelt pretensioners during an accident.

As the “brain” of the passive safety system, this module continuously monitors all connected components—from impact sensors in the vehicle’s front to seatbelt pretensioners and individual airbag modules. In milliseconds, it determines which restraint systems must be activated to provide optimal protection for occupants.

Due to its critical role, the control unit is designed to be robust; however, its installation location in the Sprinter—typically near the center console or beneath the driver’s seat—makes it vulnerable to environmental factors such as moisture, which is a common cause of failure.

Why does Airbag Control Unit 285015024 fail?

Failure of control unit 285015024 is often caused by external factors like water ingress and corrosion in the Sprinter’s footwell. Other causes include internal defects in electronic components such as MOSFETs or capacitors, cold solder joints due to vibrations, and software-based immobilization following airbag deployment (due to stored crash data).

A major contributing factor is water entering the vehicle interior. Poor sealing or inadequate splash guards can allow moisture to reach the control unit hidden beneath the carpeting, leading to severe corrosion on connectors and circuit boards—damaging traces and components.

Electronic failures are also prevalent. Voltage spikes in the vehicle’s electrical system—for example, during jump-starts or battery work—can destroy sensitive components like voltage regulators or microcontroller peripherals. Over time, thermal stress and vibration may result in cold solder joints or failure of SMD components.

After an accident in which airbags have deployed, the control unit stores so‑called crash data and locks itself out. This lockout is a manufacturer‑imposed safety feature. Although the hardware itself is often undamaged, the module refuses to operate and requires professional repair.

How do you recognize a fault in control unit 285015024?

A defect in control unit 285015024 primarily manifests as the airbag warning light remaining constantly illuminated on the Sprinter’s instrument cluster. Additionally, the module often becomes unresponsive to diagnostic tools, or specific error codes related to internal control unit malfunctions or power supply issues appear.

The most obvious sign is the red airbag warning light that fails to extinguish after the engine starts. This indicates a serious fault in the safety system, meaning airbags and seatbelt pretensioners would not deploy in the event of an accident.

During workshop diagnostics, communication with the airbag control unit is frequently lost. Diagnostic tools such as Mercedes Xentry receive no response from the module. In other cases, error codes are read out, directly pointing to internal hardware defects or problems with the power supply.

In which vehicles is control unit 285015024 installed?

The airbag control unit with part number 285015024 is specifically fitted in third-generation Mercedes-Benz Sprinters. At Airbag24, we professionally repair this module for the following model series, offering a cost-effective and reliable alternative to expensive new parts.

Mercedes-Benz:

Sprinter (model series W907 / W910, from 2018 onward)

How is control unit 285015024 professionally repaired?

At Airbag24, repairing control unit 285015024 follows a rigorous, technically sound process. Following an initial inspection and reading of the fault memory, the device is opened in an ESD‑protected environment. Defective electronic components are replaced at the chip level, and the circuit board is cleaned of corrosion. A functional test and resealing then follow.

The process begins with a careful visual inspection for external damage, particularly water damage or corroded pins on the connector. Simultaneously, the fault memory is read out to document the issues reported by the vehicle.

This is followed by technical analysis of the circuit board. Our technicians use specialized measuring instruments to examine critical components such as voltage regulators, MOSFETs in the pyrotechnic output stages, capacitors, and fuse resistors. Cold solder joints are professionally resoldered, and damaged traces are repaired.

For devices with stored crash data, the memory contents are restored to a fully functional state after hardware repair, ensuring that the control unit’s functionality is completely reinstated. We provide 2 years' statutory liability for defects on all repairs.