The reason it's stored in two modules is redundancy. It's only used by the dealer's coding software (SSS/Progman) to quickly identify the car and its options. Make no mistake - the ZCS is not used by the car or its modules. I will not explain ZCS coding into detail, but basically the ZCS is a string stored in the Electronic Body Module (Elektronik Karosseriemodul - EKM) and the Electronic Immobilizer System (Elektronische Wegfahrsperre - EWS) describing all options of the car. ZCS The dealer way of recoding the car to, for example, retrofit options is through changing the Central Coding Key (Zentraler Codierschlüssel - ZCS). The message is written with the BMW E31 in mind, but it applies to other bimmers as well. The only thing that's new is a program, called NCS Dummy, which may make things a bit easier. The method is not new, several members in the Diagnostic Software subforum of this board already practice this method. Thanks! This message describes a method of coding modules. That's beyond the scope of this message and I will not answer these questions. Please don't ask where to get this software, how to install it or how to get it work. NCS Dummy - Taking the expert out of NCS Expert By Preface This message mentions the use of software like BMW NCS Expert.
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