Mini Cooper R55 R56 R60 CAS 3 ECU Control Unit Key Reading Module 6943811

Mini Cooper R55 R56 R60 CAS 3 ECU Control Unit Key Reading Module is a factory control module responsible for immobilizer operation, key authorization, and engine starting in selected Mini models. It is a component from the Electronic control modules and controllers group, designed for precise integration with the vehicle's electrical system and other controllers within the CAN network.

Specifications and technical data

• SKU: 6943811
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 6943811
• Substitutable numbers: 61359395657, 9395657 6943811, 61359287535 61359237047 61359217853, 61359147226 61359226238 61356943822, 9287535 9237047 9217853, 9147226 9226238 6943822, 61356943811
• Category: ECUs & Computer Modules

Function of the CAS 3 module in Mini Cooper

The CAS 3 module plays a key role in the Mini's electronic security system – it is responsible for reading the transponder in the key, verifying driver authorization, and transmitting the signal to allow the engine to start. In practice, this means that a correctly selected and functional CAS 3 controller is essential for the stable operation of the start/stop system, steering column lock, and communication with other comfort and engine controllers.

Thanks to its OEM design, the module is optimized for the electrical architecture of the Mini Cooper R55, R56, and R60, which translates into predictable system behavior, correct diagnostics, and the ability to program it according to the manufacturer's procedures.

Selection by part numbers and compatibility

This CAS 3 controller has a dedicated OEM part number and a set of interchangeable numbers, which facilitates precise matching to a specific equipment version and vehicle year. In practice, selection is made by comparing the part number with the existing module or the manufacturer's catalog, as well as verifying compatibility with the specific Mini Cooper platform.

An extensive list of reference numbers increases the chance of finding a module that fits a given car without the need for an expensive purchase of a new controller. This solution is particularly beneficial for advanced electronics repairs, where both hardware compatibility and the ability to adapt the part to the vehicle are important.

Benefits of using an original module

Using an original, dismantled CAS 3 module allows you to maintain the consistency of the Mini's electronic system and avoid problems typical of low-quality replacements. The most important advantages include:

• maintaining the factory logic of the comfort and security system,
• proper cooperation with other controllers in the vehicle network,
• possibility of diagnostics and programming using standard service tools,
• optimal cost-to-functionality ratio compared to new components.

For workshops specializing in the Mini brand and users who care about the technical correctness of repairs, choosing such a module is a way to maintain high reliability of the electronic system at controlled service costs.

Condition, origin, and service application

The offered module comes from dismantling and is marked as a used OEM Mini brand component. Such controllers are frequently used in professional automotive electronics services for:

• repairs after electrical system damage or short circuits,
• solving problems with starting and key recognition,
• restoring vehicle configuration after replacing other controllers,
• comparative diagnostics in case of difficult faults.

Before installation, the CAS 3 module requires standard service procedures, such as matching to a specific vehicle, potential programming, and synchronization with the key and engine controller according to the procedure used in Mini.

More about working with electronic modules

If you are interested in a broader context of working with advanced electronics in BMW/Mini group vehicles – including comfort modules, engine controllers, or multimedia systems – it is worth checking out an expert guide describing a practical approach to repairs and the use of dismantled parts: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using dismantled parts?

If you are planning a comprehensive repair or upgrade of the control electronics area in your Mini and need other elements from the same group, such as comfort controllers, body modules, or other ECU units, check the available parts in the Electronic control modules and controllers Mini category.