BMW 1 3 5 Series E60 E87 E90 CAS 3 ECU Control Unit Key Reading Module 6943814

The CAS 3 module for BMW 1, 3, and 5 Series (E60, E87, E90) is an advanced component in the Electronic Control Units and Controllers category, responsible for managing the comfort access system and key authorization. The offered controller is a solution designed for professional vehicle electronics repairs, ensuring proper communication with the key and other modules in the car. It is a practical choice for workshops specializing in BMW electronics and for users who care about the correct operation of the starting system.

Specifications and technical data

• SKU: 6943814
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6943814
• Substitutable numbers: 61359226238, 9226238, 61359395657, 9395657, 61359287535613592370476135921785361359147226, 9287535923704792178539147226, 61356943814, 6943814, 61356943797, 6943797, 61359217853, 9217853, 61359147226, 9147226, 61359147221, 9147221, 61359147191, 9147191, 61359147195, 9147195, 61359147184, 9147184, 61356943834, 6943834, 61356943822, 6943822, 61356943771, 6943771, 61356943791, 6943791, 61356981416, 6981416, 61356964051, 6964051, 61356943766, 6943766, 61356943811, 6943811, 61356943796, 6943796
• Category: ECUs & Computer Modules

Purpose and Function of the CAS 3 Module

The presented BMW CAS 3 module plays a key role in the vehicle's electronic access and starting control system. It is responsible for:

• recognizing the key and authorizing engine start,
• cooperating with the vehicle's electrical system regarding the starter lock,
• communicating with other controllers in the vehicle network (including the comfort system),
• managing functions related to car access security.

Thanks to this module, it is possible to restore the correct operation of the starting system in case of damage to the original controller or problems with key reading.

Compatibility and Replacement Numbers

The CAS 3 unit has been designed specifically for selected BMW 1, 3, and 5 Series models of the E60, E87, E90 generation. The module has a dedicated OEM part number and an extensive list of interchangeable numbers, which facilitates the selection of the appropriate controller for a specific vehicle configuration. The presence of multiple reference numbers allows this component to be used as a replacement in various equipment versions, provided it is correctly matched to the car.

Before purchasing, it is recommended to compare the markings with the damaged module and verify compatibility with the vehicle's installation to ensure seamless integration with the existing electronic system.

Condition, Origin, and Service Application

The offered controller comes from the BMW OE line, meaning it is an original part used at the factory in vehicles of this brand. The product is used, making it an economical solution while maintaining operational characteristics consistent with the manufacturer's original specifications.

The CAS 3 module is particularly useful in the following service applications:

• repairing vehicles with starting problems resulting from damaged CAS controller,
• replacing a damaged module as part of professional electronics diagnostics,
• projects related to key programming and controller adaptation in BMW.

Due to the system's specificity, the installation and configuration of the module should be performed by a workshop with appropriate diagnostic tools and experience in working with BMW electronics.

Benefits of Using an Original CAS 3 Module

Using an original module from the Electronic Control Units and Controllers category helps maintain the consistency of the vehicle's electronic system. The main advantages include:

• maintaining the original operating logic of the access and starting system,
• better compatibility with other controllers in the vehicle,
• possibility of correct adaptation and coding using standard BMW service tools,
• stable operation of the vehicle's security system.

For workshops specializing in the BMW brand, such a module is a valuable component that allows for effective and technically correct repairs, without the need for universal solutions.

Related Products and Technical Knowledge

If you are looking for other BMW Electronic Control Units and Controllers, check out our dedicated offer: BMW electronic control units and controllers. This will help you easily select additional controllers needed for comprehensive electrical system repairs.

When working with used controllers, it is useful to know the differences between refurbishment and installing original parts from disassembly. Practical tips on choosing the right solution can be found in the article: refurbished or used original – which part to choose for repair. This will allow you to consciously plan the repair and choose a service strategy for a specific case.

Although the described blog post mainly concerns another brand, the issues related to maintaining the vehicle's character using original parts are similar – you can read more about this here: how used original modules help maintain brand DNA.