Audi A4 S4 B8 Antenna Amplifier Radio Aerial AM/FM 8K9035225A

Audi A4 S4 B8 Antenna Amplifier Radio Aerial AM/FM is a component from the Electronic control modules and controllers group, responsible for stable amplification of the radio signal in the AM/FM band. The original Audi design ensures proper cooperation with the factory audio system, which translates into comfortable radio station reception without interference.

Specifications and technical data

• SKU: 8K9035225A-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K9035225A
• Substitutable numbers: 8K9035225A, 8K9 035 225 A
• Part type: AMP Controllers
• Category: ECUs & Computer Modules

Purpose and function of the antenna amplifier

The presented antenna amplifier has been designed for the antenna system in Audi A4 and S4 models of the B8 generation, where it is responsible for stable AM/FM signal amplification from the roof or body antenna. As an electronic component integrated with the vehicle's installation, it works with the factory radio, minimizing noise and drops in reception quality under typical road conditions. In practice, this means that the module ensures:

• an increase in the radio signal level from the antenna,
• reduction of interference coming from the vehicle's electrical system,
• maintenance of the most stable station reception in the AM and FM bands.

Construction and integration with the Audi installation

As a part from the Electronic control modules and controllers group, the antenna amplifier is adapted to work within the Audi bus and electrical system. The module's design provides for installation in the factory-designated location on the body, which facilitates service and reduces the risk of installation errors. The connectors used are matched to the vehicle's wiring harness, allowing the component to be plugged into the existing system without the need for installation modifications. The module is prepared to work with the factory Audi radio, which allows for maintaining the consistency of the entire multimedia system and avoiding compatibility issues typical of universal solutions.

Benefits of using an original Audi module

Using an original antenna amplifier in an Audi A4/S4 B8 allows for restoring the proper operation of the radio path after damage or wear of the previous component. Key advantages include:

• Full electrical and mechanical compatibility with the vehicle's installation, without the need for wiring harness adaptation.
• Proper matching of amplification parameters to the factory Audi antenna and radio.
• The ability to maintain the original functionality of the audio system after repair or replacement. Thanks to this, the module is a good choice both for standard repairs and for restoring the efficiency of the factory system after interference with the installation.

Product characteristics and condition

The offered antenna amplifier comes from the group of original Audi components and is classified as a used electronic component. Such parts are often chosen for servicing older vehicles, where a reasonable repair cost is important while maintaining compliance with factory specifications. The module is intended for installation in place of the factory amplifier, using existing mounting points and connectors. Before installation, it is recommended to perform a standard verification of the vehicle's antenna installation (cables, connectors, antenna) to ensure proper operating conditions for the module and to avoid secondary faults resulting from mechanical damage or corrosion within the wiring harness.

Expanding the Audi electronics system

If you are planning a comprehensive repair or upgrade of the onboard electronics in your Audi and need other elements from the same group, such as comfort modules, driver assistance controllers, or other management systems, check the available parts in the Audi electronic control modules and controllers category. When selecting used electronic modules – such as antenna amplifiers, controllers, or other systems – it is worth following proven procedures and practical tips. A detailed discussion of this topic can be found in the article "The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?", which will help you consciously plan your repair and select the appropriate components.