BMW E81 E87 E90 E91 Hands-free Electronics Charging MULF2 9224673

BMW E81 E87 E90 E91 Hands-free Electronics Charging MULF2 is an original component from the Electronic control modules and controllers group, designed for the integration of the Bluetooth system in selected BMW 1 and 3 Series models. The module is responsible for stable communication between the phone and the vehicle, ensuring convenient operation of the hands-free system and multimedia functions.

Specifications and technical data

• SKU: 9224673
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9224673
• Substitutable numbers: 84109123290, 9123290, 84109226711, 9226711, 84109215184 84109128722 84109163348 84109195246, 9215184 9128722 9163348 9195246, 84109178862 84109132539 84109200821 84109221029, 9178862 9132539 9200821 9221029, 84109204545 84109147516 84109149656 84109181378, 9204545
• Category: ECUs & Computer Modules

Purpose and function of the MULF2 module

The presented MULF2 Bluetooth controller was designed by BMW as a component of the factory communication system in E81, E87, E90, and E91 series vehicles. Its task is to handle Bluetooth data transmission between the vehicle and external devices, which allows for:

• making phone calls using the factory hands-free system,
• integrating the phone with the vehicle's audio system,
• controlling selected functions via the buttons in the car.

Thanks to the use of a dedicated controller, communication is stable, and integration with the vehicle's electrical system is carried out in an orderly manner and in accordance with the manufacturer's specifications.

Benefits of using an original BMW module

The original BMW MULF2 module ensures full compatibility with the electrical installation and the vehicle's network architecture. This means:

• retaining the factory functionality of the Bluetooth system without the need for wiring modifications,
• proper cooperation with the factory radio or iDrive system,
• consistency with the vehicle's software and the possibility of its subsequent configuration.

An additional advantage is the presence of numerical replacement markings, thanks to which the module can be used as a substitute for several factory references within the same BMW platform. This facilitates the selection of the appropriate controller during repairs and equipment upgrades.

Characteristics and practical application

The MULF2 module is a component permanently mounted in the vehicle's installation as part of the comfort and multimedia system. In practice, it is used in situations such as:

• restoring the operation of the factory hands-free system after the failure of the previous controller,
• supplementing the car's equipment with a Bluetooth function as part of retrofits based on OEM parts,
• replacing a damaged module with a functional unit from the same family of controllers.

As an element from the Electronic control modules and controllers category, the module communicates with other controllers in the vehicle via the data bus, which is why its selection should be based on compatibility with the specific vehicle configuration.

Product condition and installation aspects

The offered controller comes from disassembly and is a used component, which in the case of BMW OEM electronics often constitutes a cost-effective service solution. This allows for the preservation of the original system architecture while reducing costs compared to purchasing a new component.

Before installation, it is recommended to verify the module's compatibility with the equipment of the specific vehicle and – if necessary – perform appropriate coding or adaptation procedures in the vehicle. This ensures that the controller can fully cooperate with the existing installation and software.

Technical support and controller selection

When selecting Bluetooth modules and other comfort controllers, it is helpful to understand how communication works between individual elements of the BMW electronic network. In this context, it is worth reading the guide describing the practical aspects of working with electronics in the 3 and 5 series, available in the article Joy of driving for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models. You will find tips there regarding working with modules, such as comfort controllers or multimedia units, using parts from disassembly.

If you are planning a comprehensive repair or upgrade of the comfort and multimedia systems area in your BMW and need other elements from the same group, such as comfort controllers, communication modules, or multimedia units, check the available parts in the BMW electronic control modules and controllers category.