Mini Cooper R55 R56 R57 2 Radio Boost CD Audio Player Head Unit 3455539

Mini Cooper R55 R56 R57 2 Radio Boost CD Audio Player Head Unit is an original audio module designed for factory installation in Mini Cooper R55, R56, and R57 generation models. The device acts as the central control unit for the radio system and CD player, ensuring seamless operation with the vehicle's other electronics. Thanks to its compatibility with the Mini wiring system, it provides a safe and predictable service solution when replacing a faulty radio.

Specifications and technical data

• SKU: 3455539-2
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 3455539
• Substitutable numbers: 65123452681, 3452681, 65123455539, 3455539, 65123453634, 3453634, 65123455263, 3455263, 65123452105, 3452105, 65123454567, 3454567, 65123452051, 3452051, KZ
• Category: Fuses & Fuse Boxes

Purpose and function in the vehicle

The presented head unit is a factory component of the Mini audio system, responsible for operating the radio and CD player. As an OEM component, it works with the original wiring harness, displays, and vehicle controls, which reduces the risk of compatibility issues typical of universal aftermarket replacements.

The Radio Boost CD integrates with the existing electrical architecture, including circuits protected by Fuses and fuse boxes, which facilitates diagnostics and service in the event of potential installation faults.

Construction and integration with the electrical system

The unit is designed as a module mounted in the center console, with dedicated connectors for the factory Mini wiring harness. This design allows for:

• maintaining the original appearance of the dashboard,
• proper cooperation with the vehicle's power and protection system,
• easier identification in Mini diagnostic systems.

Thanks to the factory electrical architecture, the radio works with the fuse system, which helps protect both the module itself and other installation components from the effects of surges or short circuits.

Benefits of using an original Mini unit

Using an original audio module in a Mini Cooper R55, R56, and R57 brings a number of practical service and functional benefits:

• Consistency with vehicle electronics – maintaining full integration with Mini onboard systems, including the electrical protection system.
• Stable audio system operation – no need for installation modifications, soldering wires, or using additional adapters.
• Easier diagnostics – the module is recognized by factory service tools, which makes it easier to locate faults in power and control circuits.

This solution is particularly recommended for professional repairs where predictable performance and compliance with the manufacturer's service documentation are essential.

Condition and service application

The offered item comes from the Fuses and fuse boxes category, which emphasizes its close connection to the power supply and circuit protection system in the vehicle. As a used part, it is a good choice for an economical repair of the factory audio system when the priority is to maintain the original equipment configuration.

The Radio Boost CD will work well both as a replacement for a damaged unit and when restoring a car to factory specifications after previous modifications to the multimedia installation.

Expanding the Mini protection and audio system

If you are planning a comprehensive repair or upgrade of the electrical and audio installation area in your Mini and need other elements from the same group, such as power modules, protection circuits, or components related to installation protection, check the available parts in the Mini Fuses and fuse boxes category.

To compare the characteristics of advanced powertrains and their accompanying systems, including solutions used in sports versions, it is worth reading the design analysis in the article Audi RS vs other models – what is hidden under the hood and chassis?, which shows how manufacturers integrate electronics, brakes, and chassis in modern cars.