BMW E60 E81 E87 E90 E91 E92 CAS 3 ECU Control Unit Key Reading Module 6943834

BMW E60 E81 E87 E90 E91 E92 CAS 3 ECU Control Unit Key Reading Module is a key electronic component responsible for handling comfort functions and ignition authorization in BMW 1 Series E87 and 3 Series E90 vehicles. This original controller from the Electronic control modules and ECUs category ensures consistent operation of vehicle systems, maintaining factory logic and CAN network communication. It is a solution for users who want to restore full electronic functionality while adhering to manufacturer standards.

Specifications and technical data

• SKU: 6943834
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6943834
• Substitutable numbers: 61359147195, 9147195, 61359147199613569438306135914718461356943834, 9147199694383091471846943834, 6135694383661359147173, 69438369147173, 61359395657, 9395657, 613592875356135923704761359217853, 928753592875359217853, 6135914722661359226238, 914722692
• Category: ECUs & Computer Modules

Function and role of the CAS controller in BMW E87 / E90

The CAS controller in BMW is responsible for advanced handling of the vehicle access system, engine starting, and integration with other comfort modules. As a central element for many electronic functions, it works with the vehicle's wiring, data bus, and other controllers, creating a coherent electronic ecosystem. Using an original module allows for proper communication with the key, ignition switch, and security systems.

Benefits of using an original BMW comfort module

Choosing an original CAS comfort module for BMW E87 / E90 primarily ensures compatibility with the vehicle's factory electrical architecture. The controller from this group:

• ensures correct cooperation with the existing wiring harness and other controllers,
• maintains the manufacturer's intended logic for comfort and security systems,
• facilitates diagnostics using dedicated BMW service software,
• allows for the use of available interchangeable part numbers to match the specific vehicle configuration. As a result, the module is a practical solution both for repairs following electronic failure and for replacing a damaged controller with a component of proven functionality.

Application in service practice

The CAS module from this series is widely used in professional workshops specializing in the BMW brand, especially for repairs related to starting issues, key-to-vehicle communication, or malfunctions of comfort functions. Thanks to the presence of the OEM part number and an extensive list of interchangeable numbers, service centers can precisely select the controller for a specific equipment version. In service practice, it is also important that modules from this group are well recognized by diagnostic software, which facilitates coding, adaptation, and verification of correct operation after installation. This translates into a more predictable repair process and reduces the risk of incompatibility.

Product condition and economic aspect

The offered CAS controller is a used component, which allows for a significant reduction in repair costs compared to purchasing a new module, while maintaining the original manufacturer's specifications. For many BMW E87 and E90 series users, this is a reasonable compromise between quality and budget, especially for older model years where investment profitability is of great importance. Using a verified module from the secondary market is often a recommended solution in specialized service centers, provided that the part number is correctly matched and appropriate programming and adaptation procedures are carried out in the vehicle.

More about the operation of BMW electronic modules

If you want to better understand how the repair and configuration of electronic modules in BMW work in practice – including comfort controllers, FRM modules, or engine ECUs – it is worth checking out the guide on iDrive systems and the electronics of the 3 and 5 series. A detailed discussion can be found in the article: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models. If you are planning a comprehensive repair or upgrade of the comfort electronics area in your BMW and need other components from the same group, such as body controllers, light modules, or central locking management units, check the available parts in the BMW Electronic control modules and ECUs category.