Mercedes W204 Navigation CD Player Radio Stereo Sat Nav Head Unit A2049005112

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W204 Navigation CD Player Radio Stereo Sat Nav Head Unit is a factory-fitted head unit designed for integration with the multimedia and navigation system in this model. As a component from the Electronic control modules and controllers group, it is responsible for handling audio functions, interface control, and interaction with the vehicle's factory equipment. Using a pre-owned module of this type allows for an economical yet professional repair or restoration of the full functionality of the multimedia system.

Specifications and technical data

• SKU: A2049005112
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2049005112
• Substitutable numbers: A2049005112, A 204 900 51 12
• Category: ECUs & Computer Modules

Purpose and function in the vehicle

The presented navigation and radio unit is a central element of the factory multimedia system in the Mercedes W204 class. It is responsible for:

• controlling radio and CD player functions,
• operating the vehicle's satellite navigation,
• interacting with factory buttons and cockpit-level controls,
• communicating with other electronic modules via the vehicle's bus system.

By maintaining OEM architecture, the module ensures consistent operation with other controllers, which translates into stable performance of the entire infotainment system.

Advantages of using an original module

Using an original head unit in a Mercedes W204 is crucial for the proper operation of onboard electronics. Factory compatibility with the electrical installation reduces the risk of communication errors, coding issues, or malfunctions of navigation functions. As a component from the Electronic control modules and controllers group, the module is designed to operate in a demanding automotive environment, accounting for interference, temperature, and vibrations.

A pre-owned OEM unit is also a cost-effective solution – it allows for restoring full system functionality without the need to invest in expensive replacements or modifying the installation.

Integration with the installation and other controllers

The Mercedes W204 Navigation CD Player Radio Stereo Sat Nav Head Unit works with other electronic vehicle modules, such as comfort controllers, audio systems, or the central display. This enables:

• retaining the original user interface on the screen,
• proper operation of system messages and navigation prompts,
• support for functions from the multifunction steering wheel (if present in the given configuration),
• consistent operation with the factory sound system.

When replacing this type of module, it is particularly important to match the OEM number and ensure hardware and software version compatibility to avoid communication problems within the vehicle network.

Condition, verification, and selection of a pre-owned module

The offered item is a pre-owned electronic module, which in practice means it has been removed from a vehicle and verified for further use. This type of solution is often chosen by workshops and individual users who want to maintain the factory configuration of the vehicle at reasonable repair costs.

To select the appropriate unit for a specific Mercedes W204, it is recommended to verify the OEM part number and compare the parameters with the existing module. This minimizes the risk of incompatibility and speeds up the installation and potential coding process.

Expert support and electronics selection

If you want to better understand how to safely choose pre-owned electronic modules, how to check compatibility by OEM numbers, and what to pay attention to during installation and coding, check out our guide: Used automotive electronics – ECU modules and sensors from the secondary market. You will find practical tips there that help reduce the risk of errors when replacing controllers and other electronic components.

If you are planning a comprehensive repair or upgrade of the onboard electronics in your Mercedes and need other components from the same group, such as comfort controllers, multimedia modules, or safety system control units, check the available parts in the Electronic control modules and controllers Mercedes category.