Flat battery issue

Hello I have a 2010 mazda 5 that has a problem when left over night I have to jump start it but before I jump start the car. I can hear a clicking coming from the back of the car. I unplugged a 7 wire connector on the bcm and the clicking stopped anyone else had this issue and how did you solve it and any idea what the 7 wire connector goes to..? Thanks!
 
Are there any aftermarket items installed? Amp/sub, video screen?
No aftermarket items installed i have tracked the problem to the bcm and from there it is something on the back wiring harness that is causing the problem (back door actuator fuel cap lock) i am thinking about buying a second hand bcm and seeing if it stops if not I will have to look more into the the wires to make sure they are all ok
 
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