BMW E81 E87 LCI E90 E91 118i 318i N43 ECU Kit DME 7593666 + CAS3 + Key Manual

BMW E81 E87 LCI E90 E91 118i 318i N43 ECU Kit DME + CAS3 + Key Manual is a factory module from the Electronic control modules and controllers group, designed to support the vehicle access and starting system in selected BMW 1 Series and 3 Series models with the N43 engine. It is responsible for key authorization, communication with other controllers, and the correct starting of the powertrain, making it a key component of the vehicle's electronic system.

Specifications and technical data

• SKU: 7593666-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7593666
• Substitutable numbers: 12147640015 12147599881 5WK93725 61359147226, 7640015 7599881 9147226, 12147621178 12147593666 12147583225, 12147507228 12147580279 12147593667, 12147585654 12147575668 12147579144, 12147585304 12147599882 12147573758, 12147579142 12147583227 12147583228
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the CAS module

The presented CAS computer works with the electrical system of BMW 1 Series E87 LCI and 3 Series E90 models in 118i and 318i petrol versions with the N43 engine. The module acts as the central element of the comfort access and vehicle starting system, integrating signals from the key, ignition switch, immobilizer, and other onboard controllers. A correctly selected CAS controller allows for the restoration of full functionality of the start/stop system, anti-theft security, and vehicle network communication.

Integration with the electrical system and transmission

The CAS computer in this version is intended for cars equipped with a manual transmission, which is important when selecting a controller for a specific vehicle configuration. Using the appropriate variant for the transmission type facilitates integration with the existing wiring harness, clutch position sensors, and starting logic. This makes it possible to maintain the correct engine starting sequence and cooperation with other control modules in the vehicle.

Benefits of using an original BMW module

Using an original BMW CAS computer helps maintain the consistency of the vehicle's software and configuration, which reduces the risk of bus communication errors and coding problems. The module from this group is designed to operate in demanding temperature and electrical conditions, which translates into stable operation of the starting and security system. For workshops specializing in the BMW brand, this is a solution that allows for professional repair of electronic systems without the need to use replacements with uncertain parameters.

Characteristics of the used product

The offered CAS computer is a used item, sourced from dismantling, which is a cost-effective solution while maintaining the manufacturer's original specifications. Such modules are frequently chosen by services dealing with BMW electronics because they enable economical repair while maintaining compatibility with the factory vehicle architecture. Before installation, it is recommended to carry out appropriate diagnostic procedures, programming, and matching to the specific car in accordance with BMW service practice.

Technical support and controller selection

When working with CAS, FRM, or engine control units, knowledge about adaptation procedures and the use of parts from dismantling can be helpful. A detailed discussion of issues related to BMW 3 Series and 5 Series electronics, including the iDrive system and control modules, can be found in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 Series and 5 Series models, which discusses practical aspects of repairs using original used components.

BMW electronic control modules and controllers – expansion and service

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 modules, light controllers, or engine management units, check the available parts in the BMW electronic control modules and controllers category.

Additional tips on the safe selection of parts from dismantling and avoiding common mistakes when buying used electronic components are provided in the guide Buying used car parts • Most common mistakes when choosing tuning parts, which helps to consciously plan investments in control systems and other vehicle components.