BMW 5 6 Series E60 E61 E63 E64 Control Unit CAS 2 Module 6943851

BMW 5 6 Series E60 E61 E63 E64 Control Unit CAS 2 Module is a factory-original component from the Electronic control modules and controllers category, responsible for advanced management of the vehicle access and start system in BMW E60, E61, E63, and E64 models. This OEM solution ensures consistency with the vehicle's electrical architecture, stable communication with other control units, and predictable performance of all functions associated with the CAS2 system.

Specifications and technical data

• SKU: 6943851
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6943851
• Substitutable numbers: 61356965050, 6965050, 61356943854 61356927924 61356927929, 61356927927 61356927926 61356927930, 6927930 6927926 6927927 6927929 6927924 6943854, 61356943853 61356927928 61356960978, 61356943851 61356943857, 6943857 6943851 6960978 6927928 6943853, 61356927931
• Category: ECUs & Computer Modules

Purpose and function of the CAS2 controller

The CAS2 module in BMW 5 and 6 Series (E60, E61, E63, E64) plays a key role in managing start authorization, key handling, and communication with other body control units. As a component from the Electronic control modules and controllers category, it interacts with the vehicle's electrical system via communication buses, coordinating processes such as ignition activation and signal transmission to safety and comfort systems. By using an original controller, compatibility with factory BMW software is maintained, which facilitates diagnostics, coding, and integration with the existing vehicle configuration. This is particularly important for repairs where precise matching of the module to a specific equipment version is required.

Compatibility and interchangeable part numbers

The presented CAS2 controller is an OEM BMW part, designed for use with the E60, E61, E63, and E64 platform. Within this reference, the manufacturer has provided a wide range of interchangeable part numbers, which increases flexibility during vehicle electronics repairs and allows the module to be matched to various equipment variants within the same generations. The presence of multiple reference numbers in the technical specification means that the module can be used as a replacement for various versions of the CAS2 within the indicated models, provided it is correctly selected based on vehicle data and subsequently programmed and coded at a service center.

Product characteristics and benefits of OEM application

As an OEM BMW component, the CAS2 controller is designed for full integration with the factory electrical installation. The appropriate connectors, circuit topology, and operating logic are consistent with the original manufacturer's documentation, which minimizes the risk of communication issues between modules and reduces the need for wiring modifications. The main benefits of using an original CAS2 module include:

• maintaining factory functionality of the access and start system,
• easier diagnostics using dedicated BMW service tools,
• consistency with the existing vehicle equipment configuration,
• the ability to perform correct coding and adaptation as part of service procedures. The product is offered in used condition, which allows for cost-effective vehicle electronics repair while maintaining the original manufacturer's specifications.

Professional installation and service aspects

Due to the role of the CAS2 controller in safety and start systems, installation by a workshop with experience in working with BMW electronics and access to appropriate diagnostic software is recommended. After physical installation, the module usually requires coding or adaptation procedures for the specific vehicle to ensure that all functions – including key handling and communication with other controllers – operate correctly. Before purchasing, it is worth verifying the module's compatibility with the vehicle's data (model, year, equipment version) and comparing the reference numbers in the technical specification with the information from the removed part. This approach reduces the risk of incompatibility and speeds up the repair process.

More solutions and knowledge about BMW electronics

If you are planning a comprehensive repair or upgrade of the control electronics in your BMW and need other components from the same group, such as comfort modules, body controllers, or engine control units, check out the available parts in the BMW electronic control modules and controllers category. If you are considering using pre-owned electronic components in your car and want to better understand how to safely select controllers, comfort modules, or sensors, take a look at our guide The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?, where you will find practical tips on selecting and operating such components.