BMW 1 3 5 Series E60 E87 E90 CAS 3 ECU Control Unit Key Reading Module 9147216

BMW 1 3 5 Series E60 E87 E90 CAS 3 ECU Control Unit Key Reading Module is an original electronic control module designed for the comfort and engine start system in selected BMW 1, 3, and 5 Series models. This component from the Electronic control modules and controllers category is responsible for key authorization, ignition management, and communication with other vehicle control units, ensuring consistent operation of electronic systems. Thanks to its factory origin, the module maintains full compatibility with BMW's electrical architecture and serves as the proper foundation for professional CAS 3 system repair.

Specifications and technical data

• SKU: 9147216
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9147216
• Substitutable numbers: 61359226238, 9226238, 61359147216, 9147216, 61359147226, 9147226, 61359147221, 9147221, 61359287535, 9287535, 61359237047, 9237047, 61359217853, 9217853, PK
• Category: ECUs & Computer Modules

Function and application of the CAS 3 ECU module

The CAS 3 ECU module in BMW 1, 3, and 5 Series is responsible for handling the electronic vehicle access and start system. In practice, this means controlling the key recognition process, start authorization, and data exchange with other controllers in the vehicle network. As a factory BMW controller, it works with the electrical installation, data bus, and other modules without the need for interference with wiring or the vehicle's construction. It is a key element in resolving issues with no response to the key, immobilizer error messages, or unstable start/stop system operation.

Benefits of using an original BMW module

Using an original CAS 3 ECU module ensures:

• maintenance of compatibility with factory software and vehicle configuration,
• proper communication with other controllers within the electronic network,
• stable operation of the start system and key authorization,
• the possibility of professional adaptation using dedicated BMW diagnostic tools.

For workshops and users, this means seamless integration with the existing installation and a reduction in the risk of errors resulting from the use of non-original replacements. The module from this group is particularly recommended for repairs where full compatibility with the vehicle's equipment and factory configuration is required.

Product characteristics and condition

The offered CAS 3 ECU module belongs to the Electronic control modules and controllers category, meaning it is a component designed to work in the complex electronic environment of the vehicle. The product is used, which in practice allows for economical repair while maintaining original build quality. Such controllers come from dismantling, making them an attractive alternative to new parts, especially for older generations of BMW E60, E87, and E90 series.

Before installation, it is recommended to perform a full vehicle diagnostic and plan the programming or adaptation procedure for the module in accordance with the requirements of the specific car configuration. A properly selected and prepared CAS 3 ECU controller allows for restoring the correct operation of the start system and functions related to key handling.

Selection by numbers and technical compatibility

In the case of electronic BMW controllers, hardware and software compatibility is of key importance. This CAS 3 ECU module has an assigned OEM part number and a set of interchangeable numbers, which facilitates matching to a specific equipment version and vehicle year. When selecting, it is recommended to use manufacturer catalogs, the VIN number, and compare markings on the existing controller to ensure full compatibility with the car's installation and software.

For users who want to deepen their knowledge on the selection and installation of used controllers, a guide discussing the principles of working with automotive electronics, selection by VIN/OEM, and installation-related issues will be useful. Detailed information can be found in the article Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.

Expanding repairs within BMW electronics

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

For larger service projects involving several systems simultaneously, it is worth considering gathering all necessary elements in one place, which facilitates repair logistics and reduces the risk of errors during selection. Practical tips on this approach can be found in the guide Comprehensive supply: From the engine to the smallest clip – how to collect used car parts in one place?.