BMW E87 E90 CAS2 ECU Control Unit Module 61356943791 6943791

BMW E87 E90 CAS2 ECU Control Unit Module is an advanced component from the Electronic control modules and controllers group, responsible for managing key comfort and safety functions in BMW 1 Series and 3 Series vehicles. This CAS2 M controller works with the vehicle's electrical system, integrating multiple systems into one cohesive unit, which facilitates diagnostics and service. This used OEM component is a sensible choice for professional repairs or replacing a faulty module in a BMW car.

Specifications and technical data

• SKU: 6943791
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6943791
• Substitutable numbers: 61356943771, 6943771, 613569437916135698141661356943786, 613569437756135694376661356964051, 694379169814166943786694377569437666964051, 61359395657, 9395657, 61359226238, 9226238, 61359217853, 9217853, 61359147226, 9147226, 61359147221, 9147221, 61359147191, 9147191, 61359147195, 9147195, 61359147184, 9147184, 61356943834, 6943834, 61356943822, 6943822, 61356943814, 6943814, 61356943797, 6943797, 61356943791, 6943791, 61356981416, 6981416, 61356964051, 6964051, 61356943766, 6943766
• Category: ECUs & Computer Modules

Purpose and function of the CAS2 M module

The CAS2 M module in the BMW E87 and E90 series acts as a central comfort controller that manages selected electrical functions of the vehicle. It is responsible for interacting with the body's electronic systems, ensuring stable communication between individual controllers. This allows for precise control of comfort functions and the efficient operation of systems related to the vehicle's electronics. As an OEM BMW component, the module is structurally matched to the factory installation, which promotes seamless integration with the existing wiring harness and other controllers. This type of solution reduces the risk of compatibility issues and facilitates subsequent computer diagnostics.

Compatibility and interchangeable numbers

The presented comfort controller belongs to the CAS2 M family used in selected BMW E87 and E90 series models. The product's technical specification includes the original OEM part number and an extensive list of interchangeable numbers, which significantly facilitates the selection of the appropriate module for a specific equipment version and vehicle year. Thanks to the presence of many reference numbers in the technical data, the module can be used as a replacement for various factory variants of BMW comfort controllers. Before purchasing, it is worth comparing the markings with the vehicle documentation or using the OEM number matching to ensure full compatibility with the car's electronics.

Product characteristics and advantages of use

The offered module comes from dismantling and has the status of a used OEM controller, which allows you to combine a favorable purchase cost with maintaining the manufacturer's original specification. In practice, this means factory-fitment to the BMW installation, without the need for wiring modifications or the use of additional adapters. The main advantages of using this comfort controller in a BMW E87/E90 include:

• original OEM design, specifically engineered for the E87/E90 platform,
• preservation of the factory operating logic of comfort systems and body electronics,
• possibility of using a wide list of interchangeable numbers when selecting parts,
• easier diagnostics and coding using standard BMW service tools. Choosing a used CAS2 M module is particularly beneficial for repairs where it is crucial to maintain the vehicle's original electronic architecture and reduce costs compared to purchasing a new controller.

Professional installation and service aspects

Due to the role of the CAS2 M module in the BMW electronic system, installation by a workshop with experience in this brand's electronics is recommended. In many cases, proper coding or adaptation of the controller to the specific vehicle is necessary for all comfort functions to operate correctly. Before installation, it is worth verifying the compatibility of the OEM number and interchangeable numbers with the vehicle data, using the information provided in the technical specification section. This approach minimizes the risk of communication problems in the vehicle bus and allows for the efficient restoration of full comfort system functionality. If you are planning a comprehensive repair or upgrade of the body electronics area in your BMW and need other elements from the same group, such as light controllers, door comfort modules, or central locking management units, check the available parts in the BMW electronic control modules and controllers category.

More about BMW electronic modules and dismantled parts

When working with modules such as the CAS2 M, proper part matching, correct coding, and safe handling of the electrical system are particularly important. In a practical discussion of issues related to iDrive systems, FRM modules, and controllers in BMW 3 and 5 series, you will find many useful tips on using used electronic components. It is worth reading 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? to better understand the specifics of working with BMW electronics. If you want to compare the cost-effectiveness of purchasing original, replacement, and used parts more broadly, the guide Original, replacement, or used – which car parts are the most cost-effective? will also be helpful, as it discusses the differences in costs, quality, and matching by OEM numbers.