BMW 3 5 Series E60 LCI E90 E91 325d 525d M57N2 ECU Kit DME CAS3 + Key 7806987

BMW 3 5 Series E60 LCI E90 E91 325d 525d M57N2 ECU Kit DME CAS3 + Key is a complete control kit from the Electronic control modules and controllers category, designed for advanced management of the M57N2 powertrain in selected BMW 3 and 5 Series models. The kit includes the DME module, CAS3 module, and a matched key, which significantly facilitates integration with the vehicle's existing wiring and reduces the risk of immobilizer-related issues.

Specifications and technical data

• SKU: 7806987-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7806987
• Substitutable numbers: 13617809941, 7809941, 13618509034, 8509034, 13617811151 13617806380 13617806987 13617806152, 7811151 7806380 7806987 7806152, 13618506951 13617805288 13617808314 13617804845, 8506951 7805288 7808314 7804845, 61359147195, 9147195
• Category: ECUs & Computer Modules

Purpose and function of the ECU DME CAS3 + Key kit

This kit is dedicated to BMW 3 Series E90/E91 and 5 Series E60 LCI vehicles equipped with the M57N2 engine in 325d and 525d versions. The set includes the DME engine control unit, the CAS3 comfort and security module, and a key, allowing for consistent management of start authorization, communication with the immobilizer, and precise control of engine operating parameters.

A kit configured in this way allows for maintaining the integrity of the vehicle's electronic system, minimizing the need for additional programming by the user. This solution is particularly beneficial when replacing a damaged controller or during a comprehensive engine control system repair.

Benefits of using an original BMW module

Using an original ECU DME kit with a CAS3 module ensures:

• consistent communication within the vehicle's bus (CAN, LIN) between the engine controller and other modules,
• preservation of factory security logic and start authorization,
• easier adaptation in the vehicle compared to universal solutions,
• the possibility of further diagnostics using standard BMW service tools.

For workshops and users, this means a more predictable installation process and a higher chance of quickly restoring the vehicle's full functionality. Electronic control modules and controllers in the OEM version are designed for long-term cooperation with a specific vehicle platform, which translates into the stability of the powertrain.

Condition, fitment, and installation aspects

The item comes from a used vehicle, which in practice means it is an OEM part with verified performance in real-world operating conditions. When properly selected based on the engine version and vehicle configuration, the kit can be an effective solution for repairs where it is necessary to replace both the engine controller and the CAS module along with the key.

Before installation, it is recommended to:

• verify compatibility by OEM number and cross-reference numbers,
• check the vehicle's equipment configuration (transmission, additional systems),
• plan any necessary adaptation procedures at a selected service center.

This approach helps reduce vehicle downtime and increases the chance of seamless integration of the kit with the existing electrical system.

Use in diagnostics and powertrain modernization

The ECU DME CAS3 + Key kit can be used not only for typical replacement of a damaged controller but also in projects related to vehicle modernization or reconstruction. The presence of a paired key facilitates diagnostic work, bench testing, and immobilizer system configuration in workshop conditions.

For specialized services dealing with BMW electronics, this is a practical solution that allows for:

• simulating powertrain operation outside the vehicle,
• analyzing errors and controller operation logs,
• preparing the vehicle after an engine or wiring harness replacement.

If you are planning a comprehensive repair or modernization of your BMW's engine area and need other components from the same group, such as additional controllers, engine management modules, or security systems, check the available parts in the BMW electronic control modules and controllers category.

Technical support and selection of used electronics

When selecting used controllers, it is crucial to properly verify hardware and software compatibility, as well as match them by OEM and reference numbers. Proper identification helps avoid communication problems between modules and issues with starting the vehicle after installation.

To better understand the principles of selecting and installing such components, it is worth reading the guide describing the practical aspects of working with second-hand electronics: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?

Additional information on comparing new and used components is also provided in the article: New or used? A comparison of costs and quality of car parts, which helps to consciously assess the cost-effectiveness of purchasing original modules in used condition.