UNDERSTAND BMW CAS SYSTEM

The BMW Car Access System (CAS) is a crucial security feature in BMW vehicles, designed to prevent unauthorized access and starting of the engine. BMW has released several versions of the CAS system, each with its unique features and capabilities. In this article, we'll dive into the different versions and types of the BMW CAS system, how they work, and the various key types used.
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BMW CAS System Versions:
BMW has released four versions of the CAS system to date:

1. CAS1: The first version of the CAS system was introduced in 1995 and was used in BMW models until 2005. It had limited functionality and was only capable of immobilizing the engine.
2. CAS2: The CAS2 was introduced in 2003 and was used in BMW models until 2007. It had additional features such as remote keyless entry and was capable of storing multiple keys.
3. CAS3: The CAS3 was introduced in 2007 and was used in BMW models until 2013. It had improved anti-theft features, such as encrypted communication between the key and the CAS module, making it more difficult to clone keys.
4. CAS4: The CAS4 was introduced in 2008 and is currently used in BMW models. It features a faster processor, improved encryption, and the ability to use a proximity sensor to unlock the car without pressing any buttons.

How the BMW CAS System Works:
The BMW CAS system works by reading a coded signal from the key fob and verifying it with the CAS module. If the signal is valid, the CAS module will send a message to the Engine Control Unit (ECU) to allow the engine to start. If the signal is invalid or absent, the CAS module will prevent the engine from starting.

BMW Key Types:
There are two main types of keys used with the BMW CAS system:

1. Remote Key: This type of key contains a small transmitter that sends a coded signal to the CAS module when a button is pressed. The CAS module then verifies the signal and allows the engine to start.
2. Comfort Access Key: This key contains a proximity sensor that allows the car to be unlocked without pressing any buttons. When the key is within range, the car will automatically unlock, and the engine can be started by pressing a button.

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