Airbag control unit with part number 2841448501

What is the function of Airbag Control Unit 2841448501?

The airbag control unit with part number 2841448501 is the central control module for the occupant protection system in the Mercedes-Benz Citan W415 (model years approximately 2012–2021). It continuously analyzes data from crash sensors and is responsible for precisely and rapidly deploying airbags and seatbelt pretensioners in the event of a collision.

The control unit serves as the brain of the entire SRS system (Supplemental Restraint System). It communicates via the CAN bus with other vehicle components and performs continuous self-tests to ensure the functionality of all connected ignition circuits and sensors.

In the aftermarket, this component is also known by the original Mercedes-Benz part numbers A4159004401 and 8201229153. These numbers are directly linked to reference number 2841448501 and designate the same control unit for the Citan.

What defects occur in 2841448501?

Typical defects of the Citan control unit 2841448501 include internal communication errors that often trigger error code B1050, as well as crash data permanently stored in memory after an accident. These issues are usually caused by faulty hardware components such as CAN transceivers or defective memory areas (EEPROM).

A common cause of failure is the storage of crash or event data. Even after minor collisions where no airbags deployed, the control unit may become internally locked. This lock cannot be cleared using standard workshop diagnostic tools.

Another well-known issue is the loss of CAN‑bus communication, indicated by error code B1050 in the fault memory. The root cause is often defective CAN transceiver chips on the control unit’s circuit board, which are responsible for data transmission within the vehicle network.

General electronic faults—such as malfunctioning voltage regulators, damaged solder joints due to vibrations, or internal processor errors—can also lead to total failure or sporadic malfunctions of the control unit.

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

A defective airbag control unit in the Mercedes Citan W415 primarily manifests as the airbag or SRS warning light remaining constantly illuminated on the instrument cluster. Additionally, the control unit may become inaccessible to diagnostic equipment, making fault analysis at the workshop impossible.

The most obvious sign is the red airbag warning light that fails to extinguish after starting the vehicle. This indicates a critical fault in the restraint system that compromises passenger safety.

In the workshop, the defect often becomes apparent through failed communication. If diagnostic tools like XENTRY or Bosch KTS cannot establish a connection to the airbag control unit, or if the connection keeps dropping, this points to a severe internal fault.

Read fault codes—especially code B1050—specifically indicate a communication problem within the control unit itself and serve as strong evidence of a defect requiring repair.

In which vehicles is control unit 2841448501 installed?

The airbag control unit with part number 2841448501 is specifically used in the Mercedes-Benz Citan W415 vehicle series. At Airbag24, we repair this control unit for all variants of this series produced between approximately 2012 and 2021, including van, MPV/estate, and Mixto models.

Our repairs at Airbag24 cover all engine types and trim levels of the Citan W415 where this control unit was factory-installed. The repair service is a proven solution for the following models:

Mercedes-Benz: Citan Van/MPV/Mixto (W415 series, circa 2012–2021)

How is control unit 2841448501 professionally repaired?

After being sent to Airbag24, control unit 2841448501 undergoes a comprehensive electronic analysis at the component level. The repair process includes fixing hardware defects such as faulty CAN transceivers and selectively erasing crash data from the internal memory, while fully preserving the original vehicle coding.

The process begins upon receipt of the removed control unit in our electronics laboratory. First, the internal memory (EEPROM/Flash) is read using specialized programming devices to analyze the exact fault status, crash entries, and vehicle-specific configuration.

Next comes the actual repair on the circuit board. Defective components such as voltage regulators or CAN transceivers are expertly replaced under ESD‑safe conditions. Stored crash data is reset at the software level, restoring full functionality to the control unit without requiring re‑coding of the vehicle.

After repair, the unit is tested on a test bench whenever possible to verify the proper functioning of its internal self-diagnosis and communication interfaces. We provide 2 years' statutory liability for defects on every repair.