Mercedes-Benz B-Class W245 airbag control unit repair

What is a Mercedes-Benz B-Class W245 airbag control unit?

The Mercedes-Benz B-Class W245 airbag control unit is the central safety unit that activates all occupant restraint systems in the event of an accident. It continuously monitors sensors, stores relevant crash data, and ensures the immediate and proper deployment of all airbag modules and seat belt pretensioners in the vehicle to ensure maximum occupant safety.

This electronic assembly is crucial for passive safety in Mercedes-Benz B-Class W245 vehicles (built approximately 2005-2011).

It collects and processes data from impact sensors and other safety sensors to enable precise and rapid response in an emergency. The control unit communicates with other vehicle modules via the CAN bus system.

Why is the Mercedes-Benz B-Class W245 airbag control unit defective?

The Mercedes-Benz B-Class W245 airbag control unit often malfunctions because it stores crash data after an accident, preventing the airbag warning light from deactivating and blocking the system. Internal electronic errors, voltage spikes, or age-related wear and tear can also lead to failures, necessitating a professional Mercedes-Benz B-Class W245 airbag control unit repair.

A common cause of a malfunction is the storage of crash data after an accident, even if the airbags were not deployed. This blocks function and requires a special reset or Mercedes-Benz B-Class W245 airbag control unit repair.

Internal software errors, communication problems, or issues with the power supply to the 12V electrical system can also lead to failure. Such problems are often indicated by an illuminated airbag warning light in the instrument cluster.

Common error codes for Mercedes-Benz B-Class W245 airbag control unit repair

During Mercedes-Benz B-Class W245 airbag control unit repair, specific error codes may occur that indicate internal defects or system malfunctions. These codes, such as B9111 or B1000, often signal stored crash data or communication problems within the airbag system that require the control unit to be reset or repaired.

These codes are exclusively control unit-specific and do not refer to sensors or other airbag components. They facilitate diagnosis during Mercedes-Benz B-Class W245 airbag control unit repair.

• B9111 → Internal control unit error → Typical for stored crash data or difficulties in clearing the fault memory.
• B1000 → Control unit communication error → Occurs when data transmission is disrupted or there is an internal hardware problem in the airbag control unit.
• B1003 → Control unit defective → Indicates a serious internal defect in the module, often associated with failure of system functions.
• B119C → Control unit error (internal error) → Indicates a malfunction within the control unit electronics that requires inspection.
• B1600 → Control unit defective / internal error → A general code indicating a failure or internal malfunction of the airbag control unit.
• AD67 → SRS control unit defective → Manufacturer-specific code for a defect in the Supplemental Restraint System (SRS) control unit.
• 9004 → Voltage too high (control unit error) → Caused by overvoltage in the vehicle electrical system, which has affected or damaged the control unit.
• B2D92 → Control unit defective → Confirms an internal error or damage to the airbag control unit, which affects its function.
• AE69 → Control Unit Lowline Internal Error → A specific internal error that disrupts the communication or function of the control unit at a low level.

What part numbers are available for the Mercedes-Benz B-Class W245 airbag control unit repair?

For Mercedes-Benz B-Class W245 airbag control unit repairs, several specific OEM part numbers are relevant, which have been verified to be specific to this model. These numbers, such as A1698206626 or A1698209926, identify the original control units from Mercedes-Benz or its supplier TRW, ensuring correct replacement part identification.

It is crucial to match the exact part number of your defective control unit to find the correct component for the Mercedes-Benz B-Class W245 airbag control unit repair.

All part numbers listed here are genuine OEM parts and have been verified for the Mercedes-Benz B-Class W245 (06/2005 - 08/2011). They are either from Mercedes-Benz directly or from the supplier TRW.

• A1698206626 (Mercedes-Benz / TRW)
• A1698206726 (Mercedes-Benz)
• A1698207726 (Mercedes-Benz)
• A1698209926 (Mercedes-Benz / TRW)

These part numbers represent the most commonly installed airbag control units in this series. A professional workshop can verify compatibility before repairing the Mercedes-Benz B-Class W245 airbag control unit.