ECU or Multi timer unit renault clio 52 reg

getting confused now is the multi timer unit and the ECU the same thing or not and what is the BCM, having problems with central locking could be due to rain leak was planning on having a look at what i presumed was the ECU located behind the fusebox, i have looked through the haynes manual and it says that behind the fusebox is a multitimer unit and if the multitimer unit is disconnected then it has to be reprogrammed by a professional. the reason i'm getting confused is that i have been told that the ECU is located behind there so guys which is it ? and the main question is if i unplug whichever it is will my car need reprogamming sorry if i have confused anyone else.

thanks

ECU or Multi timer unit renault clio 52 reg