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 an advanced electronic control module designed for the vehicle access and start system in selected BMW 1 and 3 series models. As a component from the Electronic control modules and ECUs group, it is responsible for proper communication between the key, ignition switch, electrical system, and other control units in the car. This used, original CAS module allows for maintaining the factory operating logic of comfort and safety systems.

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
• Part type: Central Timing Module
• Category: ECUs & Computer Modules

Function and role of the CAS module in BMW

The CAS module in BMW E87, E90, and E91 series plays a key role in vehicle start authorization and access management. It is responsible for, among other things:

• verifying the key and engine start authorization,
• cooperating with other control units in the vehicle network,
• handling comfort functions related to vehicle access,
• coordinating electrical signals between the ignition switch and the vehicle's electrical system. Thanks to this, the BMW E87 E90 E91 CAS 2 Control Unit ECU Key Reading Module is an essential element of the BMW electrical architecture, influencing system stability and proper communication within the data bus.

Compatibility and interchangeable numbers

The offered control unit comes from the line of original BMW components, which facilitates selection for a specific vehicle configuration. The module has a dedicated OEM part number and an extensive list of interchangeable numbers, which increases the possibilities of matching it to different equipment versions within the same generation. The presence of multiple reference numbers allows workshops and users to precisely match the control unit to a specific car while maintaining compliance with factory specifications. For certainty of selection, it is worth comparing the module markings with the vehicle data or consulting an automotive electrician specializing in the BMW brand. This approach minimizes the risk of communication problems in the CAN network and potential system errors.

Benefits of using an original BMW module

Using an original CAS module from the Electronic control modules and ECUs group provides a number of practical benefits in daily operation:

• maintaining the factory logic of the start/stop system and vehicle access,
• consistency with other control units in the vehicle,
• reduced risk of software conflicts compared to replacements of unknown origin,
• easier diagnostics using factory BMW service tools. For workshops specializing in the BMW brand, this means a more predictable installation and configuration process, and for the user – stable operation of electronic systems. The original CAS module is a solution particularly recommended for professional electrical system repairs.

Product condition and service application

The module is offered as a used item, which is a reasonable compromise between cost and maintaining the original manufacturer quality. This type of control unit is frequently chosen by workshops for:

• repairs after electrical system damage,
• problems with start authorization or communication with the key,
• diagnostics of faults related to the network of control units in the vehicle. Before installation, it is recommended to perform full vehicle diagnostics and prepare the module for programming or adaptation to a specific BMW unit, in accordance with service procedures.

BMW electronic control modules – expansion and service

If you are planning a comprehensive repair or upgrade of your BMW's onboard electronics and need other components from the same group, such as comfort controllers, light modules, or engine management units, check out the available parts in the BMW electronic control modules and ECUs category. For a better understanding of how original used components influence the character and handling of premium class cars, it is worth reading an article describing the role of factory components in maintaining driving characteristics and comfort – you can find it here: Audi and pure emotion – how used parts help maintain the brand's DNA.