EWS III (3.3) Control Module
The EWS III (3.3) Control Module uses the same 13 pin connector as EWS III (3.2) but functions differently. The EWS III (3.3) module has a Rolling Code" ISN assigned to it during manufacture. The "Rolling Code" is burned into the module and cannot be overwritten by ZCS Coding or DME alignment procedures.
The "Rolling Code" is a one way signal from the EWS III (3.3) control module to the DME and is similar in operation to the data exchange between the EWS control module and the key transponder.
The "Rolling Code" will be different each time the start operation is begun. The "Codes" are taken from the "Rolling Code Table" which is assigned at the factory to the EWS III (3.3) control module and the DME.