ZCS Structure: Notes

The 37 digit structure of the ZCS is subdivided into three segments. The segments represent specific information about the vehicle.

Each segment ends with a checksum "digit". A checksum is utilized by the coding software to detect unacceptable/erroneous manually entered coding information.

Fig 1: Identifying ZCS Structure

Courtesy of BMW OF NORTH AMERICA, INC.

The information/digits of the ZCS code reflects the options installed in the vehicle and should never be changed manually unless it is necessary for special recoding functions such as:

Canadian market vehicle being moved to the US
Retrofit installation of an accessory system (ie. CPT9000 phone system or BMW ULF system)

If a modification needs to be made to the ZCS structure and there is no information available in a service bulletin then the BMW Technical Hotline should be contacted for assistance by submitting a PUMA case, requesting a modified ZCS code.

Each portion of the ZCS provides specific information regarding that vehicle:

GM (Grundmerkmale) - Identifies the "Basic Features" of the vehicle and contains 9 digits that are used to describe:

Vehicle type (E36, E38, E39 ...)
Specific body style of the vehicle (Sedan, Coupe ...)
Country specific coding identification (US, UK, ECE ...)
Unique equipment that affects the basics of the vehicle (with sunroof, without sunroof, wheel size ...)
Basic language variant (English, Spanish, German ...)

SA (Sonderausstattungs) - Identifies the "Special Equipment" of the vehicle and contains 17 digits that describe what features/functions are installed in the vehicle, such as:

Power Windows or Manual windows
Power Door Locks or Manual Door Locks
Power Sunroof or Manual Sunroof
Power Convertible Top or Manual Convertible Top
Phone Pre-wire

The SA segment is configured to provide a total of 64 possible number combinations (option groups) for all series vehicles worldwide. The information is modified whenever a new component/accessory is added to the vehicle via a retrofit coding procedure.

VN (Versionsnummer) - Identifies the "Version Number" of the vehicle and contains 11 digits that are used to describe:

Series specific coding data that are not reflected in the GM or SA segments. This includes, model year dependent data, software and hardware versions of the control modules installed, coding instructions, etc.

The VN is displayed as 40 possible combinations of digits. A deliberate change in the VN will result in erroneous coding data being used when recoding a module or coding a replacement module which will affect the proper operation of a control module(s) coded with an incorrect VN.

NOTE: In its original form the ZCS was displayed as a 48 digit code containing a fourth segment, the AM (Antriebsmanagement) which identified Powertrain management information specific to the vehicle, however this information was eliminated and was not needed for coding a control module.

FOUR DIGIT PORTION REPRESENTS VEHICLE BODY AND SPECIFIC BODY EQUIPMENT (COUPE, SEDAN, ROADSTER, SUNROOF, ETC,)

There are 4096 possible combinations of digits per model.

Fig 2: Identifying ZCS Structure Information Chart

Courtesy of BMW OF NORTH AMERICA, INC.