BMW E87 E90 E91 CAS 2 Control Unit ECU Key Reading Module 6981416

BMW E87 E90 E91 CAS 2 Control Unit ECU Key Reading Module is a factory electronic component responsible for advanced management of comfort and safety functions in BMW 1 and 3 Series vehicles. This controller from the Electronic control modules and ECUs group works with the vehicle's electrical system, handling tasks such as start authorization, key communication, and selected body functions. The offered item is a used part, providing a cost-effective service solution for users looking for an original BMW CAS module.

Specifications and technical data

• SKU: 6981416
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6981416
• 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 role of the CAS module in BMW

The CAS (Car Access System) module in BMW E87, E90, and E91 models plays a key role in the vehicle's electronic architecture. It is responsible for key identification, engine start authorization, interaction with the steering column lock, and integration with other controllers in the vehicle network. Using an original CAS controller allows for maintaining software and bus communication consistency, which translates into stable operation of comfort and safety systems.

Benefits of using an original CAS module

Using an original BMW CAS module instead of a damaged component ensures:

• preservation of the factory logic of the access and start system,
• proper cooperation with other body and powertrain controllers,
• possibility of professional adaptation and coding at a service center specializing in the BMW brand,
• reduction of the risk of communication errors in the CAN network and vehicle starting problems.

For workshops and users, this means a more predictable repair process and easier diagnostics in the future. The original CAS controller is also a beneficial choice for vehicles where maintaining full compatibility with the existing equipment configuration is essential.

Condition, origin, and installation aspects

The offered BMW CAS module comes from disassembly and is a used component, which is an attractive cost alternative to new parts. Before installation, a standard service procedure is recommended, including diagnostics, potential programming, and matching to the specific vehicle. Due to the nature of the CAS system, installation should be carried out by a workshop with experience in working with BMW electronics and appropriate diagnostic tools.

Application in service and tuning practice

The CAS module in E87, E90, and E91 models is often replaced in case of starting problems, error messages related to the key, or interference in the operation of comfort systems. Using an original controller from disassembly allows for:

• restoring the correct operation of the vehicle access and start system,
• reducing service downtime thanks to the availability of OEM parts,
• maintaining the consistency of the equipment configuration in relation to factory settings.

For users planning long-term vehicle operation, this is a solution that helps maintain the stability of electronic systems at reasonable repair costs.

Technical support and selecting the right controller

Selecting the correct CAS module for a specific BMW requires paying attention to the manufacturer's markings and compatibility with the vehicle's model year and equipment version. During the verification process, OEM part numbers and interchangeable numbers are helpful, allowing the controller to be matched to a specific configuration. Practical tips on using used BMW electronic modules, including comfort controllers and iDrive systems, 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 want to further deepen your knowledge on verifying component compatibility by OEM numbers and avoid mistakes when purchasing controllers or other electronic components, the following guide will be helpful: Online parts shopping without risk – 5 proven ways to verify component compatibility by OEM numbers and paint codes.

If you are planning a comprehensive repair or upgrade of the body electronics area in your BMW and need other components from the same group, such as comfort controllers, light modules, or access management units, check the available parts in the BMW electronic control modules and ECUs category.