BMW X5 E39 E46 E53 Motorola Hands-free Electronics Control Unit ECU 6921857

BMW X5 E39 E46 E53 Motorola Hands-free Electronics Control Unit ECU is an original component from the Electronic control units and controllers group, designed for factory-installed telephone systems in selected BMW models. The module ensures stable operation of the telephone system, proper communication with the vehicle's electrical installation, and consistency with the factory interior equipment.

Specifications and technical data

• SKU: 6921857
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6921857
• Substitutable numbers: 84216921857, 6921857, 84216917860, 6917860, 84216916565, 6916565, 84216913823, 6913823, 84216921858, 6921858, 84216914120, 6914120, 84216907048, 6907048, BG
• Category: ECUs & Computer Modules

Purpose and function of the module

The presented Motorola telephone module has been designed specifically for BMW 5 Series E39, 3 Series E46, and BMW X5 E53 vehicles. As an element of the onboard communication system, it is responsible for handling telephone functions, integration with the audio installation, and cooperation with factory comfort controllers and other electronic modules.

Thanks to a design compliant with the vehicle manufacturer's requirements, the module allows for maintaining the consistent operation of the entire electronic system, minimizing the risk of communication errors between controllers. This is a particularly beneficial solution when servicing cars equipped with original BMW telephone systems.

Benefits of using an original BMW module

Using an original telephone module to replace a damaged or faulty component allows you to maintain the vehicle's factory electronics architecture. You receive:

• reliable cooperation with the existing electrical harness and other controllers,
• preservation of telephone system functionality in accordance with the factory configuration,
• adherence to BMW quality standards regarding onboard electronics.

The module belongs to the Electronic control units and controllers group, which means it has been designed to work within the vehicle's complex controller network, with an appropriate level of resistance to interference and operating conditions in the car's cabin or compartment.

Integration with the installation and assembly

As an OEM component, the telephone module is prepared for installation in the location provided by the manufacturer, using factory connectors. This facilitates service and limits the need for modifications to the electrical installation. In practice, this translates into:

• shorter installation time compared to universal solutions,
• preservation of original harness routing and mounting points,
• lower risk of electronic system compatibility issues.

Before installation, it is recommended to verify the module's compatibility with the specific vehicle equipment configuration and perform diagnostics after installation to confirm proper communication with other controllers.

Condition and origin

The offered BMW telephone module comes from dismantling and is a used component, which is a cost-effective solution while maintaining the manufacturer's original specifications. Such components are frequently chosen for electronics repairs in older BMW generations, where both technical compatibility and a reasonable service budget are important.

Expanding the BMW electronics system

If you are planning a comprehensive repair or upgrade of the comfort and multimedia electronics area in your BMW 3 or 5 Series and want to better understand the cooperation of modules such as iDrive controllers, FRM, or engine control units with parts from dismantling, it is worth checking out the guide Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 Series models.

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