Key Reading Module BMW E60 E87 E90 CAS 3 ECU Control Unit 6943830

Key Reading Module BMW E60 E87 E90 CAS 3 ECU Control Unit is an original component from the Electronic control modules and controllers group, responsible for advanced management of comfort functions and access authorization in BMW vehicles. This CAS 3 comfort controller is designed for integration with the factory electrical system, ensuring consistent operation of vehicle systems and stable communication with other control units. By maintaining the manufacturer's specifications, it provides a solid foundation for the professional repair or replacement of a faulty module.

Specifications and technical data

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

Purpose and function of the CAS 3 comfort controller

The CAS 3 module plays a key role in handling comfort functions and security systems related to vehicle access and engine starting. In BMW E60, E87, and E90 series vehicles, it is responsible for interacting with the key system, steering column lock, central locking, and other related electronic modules. Using an original controller from the same family ensures proper communication on the data bus and minimizes the risk of diagnostic errors.

Benefits of using an original BMW module

Using a factory CAS 3 comfort controller instead of a damaged component allows for maintaining the consistency of the vehicle's software and electrical architecture. The original module from the BMW range is designed for a specific platform, which translates into:

• proper cooperation with other control units in the vehicle,
• stable operation of comfort and security systems,
• easier diagnostics using factory service tools,
• reduction of compatibility issues compared to random aftermarket replacements. For workshops specializing in the BMW brand, such a module is a practical solution for comfort system repairs, especially where maintaining the original vehicle configuration is required.

Interchangeable numbers and fitment within the BMW range

The presented CAS 3 comfort controller belongs to a family of modules with similar specifications, for which various interchangeable numbers provided by the manufacturer are available. This makes it possible to select the appropriate variant within the same product line, which facilitates service and allows for flexible adaptation to a specific equipment configuration. Information about reference numbers is visible in the technical specifications section and serves as the basis for verifying compatibility with a given vehicle.

Product condition and use in service practice

The CAS 3 comfort module is offered as a used item, which makes it an attractive cost-effective solution while maintaining original build quality. Such controllers are frequently used by workshops dealing with BMW electronics, both for routine repairs and for more complex work related to wiring replacement or equipment reconfiguration. Before installation, it is recommended to perform standard service procedures, such as diagnostics, and potential programming or adaptation to the specific vehicle in accordance with the manufacturer's guidelines.

BMW electronic control modules and controllers – expansion and service

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

Substantive support and ecological aspects

For a better understanding of how original used electronic modules influence the character and behavior of premium vehicles, it is worth reading the material describing the role of factory components in maintaining driving characteristics and comfort – you can find it in the article Audi and emotions in their purest form. How do used parts help maintain the brand's DNA?. Although it concerns a different brand, it well illustrates the importance of using original controllers and modules in premium segment cars. If you are also interested in the environmental aspect and want to learn how choosing original used electronic components affects the reduction of the carbon footprint, the article Sustainable automotive: How buying original used parts reduces the carbon footprint and protects the environment? will be helpful, as it discusses the benefits of reusing proven components.