megane 3 (rs250 seat retrofit)

hi, sorry to post a help as my first intro, but thats how ive arrived here.

i bought the wife a megane 3 coupe (poverty spec car) and being a serial "modder" set about personalising it for her, so i put the RS 250 rear/front bumpers/steering wheel, wheels etc,

now my problem lies here, i obtained a full RS 250 interior, leather/yellow bits, and they are heated/electric, now there all in and connected, but there is no power to the drivers electrics,

the loom is the same, and contains the same wires/pin in and out etc, but there is a brown plug underneath near the multi plug that has 2 wires, red and grey (ish) if i remotely power this plug i have full functions, and have set the seat for her (by just powering from a battery to move forward/backrest) , but my question is..what is the brown plug and i cant find it under the carpet anywhere, the seat has the seat electric module behind the buttons, so where does the brown 2 wire plug from the seats connect to (for power?) and does the car need coding by renault to let it know it now has electric seats?

any help would be fantastic.

thank you in advance guys.