BMW 1 3 5 Series E60 E87 E90 CAS 3 ECU Control Unit Key Reading Module 9147184

BMW 1 3 5 Series E60 E87 E90 CAS 3 ECU Control Unit Key Reading Module is an advanced electronic control unit responsible for managing the vehicle's access and starting system, including key reading and engine start authorization. As a component of the Electronic control modules and ECUs group, it works in conjunction with other comfort and security systems, ensuring consistent electronic performance in modern BMW models. This solution is intended for users and workshops that require a proven module for diagnostics, replacement, or programming within the CAS 3 system.

Specifications and technical data

• SKU: 9147184
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9147184
• Substitutable numbers: 61359147195, 9147195, 61359147199 61356943830 61359147184 61356943834, 9147199 6943830 9147184 6943834, 61356943836 61359147173, 6943836 9147173, EM
• Category: ECUs & Computer Modules

Function and application of the CAS 3 module

The presented CAS 3 control unit plays a key role in the electronic access and starting system in BMW 1, 3, and 5 Series, working with the key, electronic ignition switch, and other body modules. It is responsible for driver authorization, processing signals from the key, and transmitting information to other control units, which enables the vehicle to start correctly and protects it against unauthorized use.

Thanks to a design compliant with factory BMW standards, the module is intended for service applications, such as replacing a damaged control unit, adapting it to a used key set, or performing diagnostic work on the CAS 3 system. Original BMW branding helps maintain compatibility with the vehicle's electrical installation and software.

Benefits of using an original control module

Choosing an original CAS 3 module from the Electronic control modules and ECUs group helps reduce the risk of data bus communication issues, key authorization errors, or malfunctions of comfort systems. The control unit is designed to work with factory BMW diagnostic tools, which facilitates:

• coding and programming as part of service procedures,
• integration with the existing vehicle configuration,
• precise diagnostics of faults related to the CAS 3 system.

For workshops specializing in the BMW brand, using such a module means more efficient customer service and the ability to carry out advanced vehicle electronics repairs.

Product characteristics and condition

The offered CAS 3 module comes from dismantling and is marked as a used original BMW component. Such control units are frequently used in professional workshops that deal with electronics repair, as they allow for economical replacement while maintaining compliance with the factory vehicle architecture. Before installation, standard service procedures are recommended, such as verifying compatibility with the specific model version and preparing for programming for the given vehicle.

Thanks to the presence of the OEM part number and available interchangeable numbers, the module can be precisely matched to the specific configuration of a BMW 1, 3, or 5 Series, which minimizes the risk of hardware or software incompatibility during installation.

Installation and service tips

When replacing a CAS 3 module in a BMW, it is particularly important to follow the correct service procedure, including:

• selecting the control unit based on the OEM part number and interchangeable numbers,
• checking compatibility with the vehicle's year and equipment version,
• performing coding and synchronization with the key and other control units.

It is recommended that installation and programming be performed by a workshop with experience in working with BMW electronics, which allows for fully utilizing the module's potential and reducing the risk of errors in the security system. A correctly selected and coded CAS 3 control unit restores the proper operation of starting and comfort functions without the need for interference with the vehicle's electrical installation.

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 modules, body control units, or other ECU units, check the available parts in the BMW electronic control modules and ECUs category.

More about BMW electronics and dismantled parts

For users and workshops that want to better understand the principles of selecting and operating used control units in BMW 3 and 5 Series, a guide describing the practical aspects of working with iDrive modules, FRM, and engine control units will be useful. Detailed tips on using proven dismantled parts can be found in the article 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 considering wider use of used electronics in your workshop or private car and want to learn the criteria for the safe selection of control units, comfort modules, and sensors, it is also worth reading the guide material A second life for electronics – when is it worth choosing used engine control units, comfort modules, and parking sensors?, which discusses the practical advantages and limitations of such solutions.