BMW 3 5 Series E60 E61 E90 E91 N52 325i 525i ECU Kit DME CAS2 Key 7555361 Manual

BMW 3 5 Series E60 E61 E90 E91 N52 325i 525i ECU Kit DME CAS2 Key is an advanced electronic control module responsible for managing the vehicle access and starting system in selected BMW models with the N52 engine. This component from the Electronic control modules and controllers group is designed for use with a manual transmission, ensuring consistent operation of electronic systems as well as correct key authorization and engine start. It is a solution for users who want to restore the full functionality of the factory CAS system while maintaining high compatibility with the original installation.

Specifications and technical data

• SKU: 7555361-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7555361
• Substitutable numbers: 12147577970, 7577970, 12147555361, 7555361, 61356943771, 6943771, 5WK90078
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Function and role of the CAS module in BMW E60 / E90

The CAS computer in the BMW 3 Series E90 and 5 Series E60 with the N52 unit is responsible for key identification, start authorization, and communication with other controllers in the vehicle. The module works with the body electrical system, steering column lock system, electronic ignition switch, and engine control unit, creating a coherent security and start logic system. Thanks to the use of an original module from the same family of controllers, proper communication via the data bus is maintained, which reduces the risk of errors, fault messages on the dashboard, and starting problems. This is particularly important when replacing components in vehicles equipped with extensive comfort electronics.

Compatibility with manual transmission

The presented CAS computer is designed for configuration with a manual transmission, which is significant when selecting a controller for a specific vehicle specification. Proper matching of the module version to the transmission type:

• facilitates integration with the existing wiring harness,
• ensures correct cooperation with safety systems,
• minimizes the need for additional software modifications. For workshops specializing in BMW and users assembling vehicle electronics themselves, this is an important parameter that affects the time and cost of controller adaptation.

Application in the N52 engine (325i / 525i)

The CAS module from this series has been developed for BMW cars with the N52 petrol engine in 325i and 525i versions. It is responsible for coordinating the engine start procedure, including verification of key authorization, sending a signal to the engine controller, and cooperation with the vehicle's security systems. In practice, this means that with proper module adaptation, you can restore the full functionality of the factory start/stop system without the need for substitute solutions or interference with the installation beyond the standard assembly and programming procedure.

Benefits of using an original control module

Choosing an original CAS computer for BMW E60 / E90 brings a number of practical advantages:

• High compatibility with the factory installation – the module comes from the same family of controllers, which facilitates integration with the existing electronic architecture of the vehicle.
• Stable operation of comfort and security systems – correct communication with other controllers reduces the occurrence of errors and unwanted messages.
• Possibility of professional adaptation – the module is suitable for coding and matching in specialized BMW services or workshops dealing with automotive electronics. Thanks to this solution, you can effectively carry out repairs after a CAS module failure, starting problems, or when swapping electronics between vehicles with similar configurations.

Intended for professional workshops and informed users

This CAS computer is especially recommended for auto electricians, diagnosticians, and workshops specializing in the BMW brand that work with advanced electronic systems on a daily basis. It will also prove useful for informed users assembling controller kits during major repairs or upgrades. If you are planning a comprehensive repair or upgrade of the control electronics area in your BMW and need other elements from the same group, such as comfort controllers, body modules, or engine control units, check the available parts in the BMW electronic control modules and controllers category. For a better understanding of how important it is to use original modules in modern premium cars, it is worth reading an article describing the impact of factory components on the vehicle's character – you can find it here: Audi and emotions in their purest form – how used parts help maintain the brand's DNA.