Coding is a file that contains secondary information about the truck, including its Vehicle Identification Number (VIN). It is required for the seamless integration of DAS modules in a Mercedes truck. When you replace a module, the VIN number needs to be changed and the VIN is contained in the coding for each module. The coding is not saved automatically, so you need to save it to a location of your choice. When you are changing a module, it is crucial to try and save the coding from the module you are replacing before making it virgin. Doing this will save you a lot of time during the replacement process. In most cases, the coding can be read and saved even from a defective module. However, if the module has been damaged by water, for example, it is more likely that you will need to perform manual coding. Coding reading and writing are performed using the corresponding buttons in the software.