Heater thermal fuse , where to plug wires in

I have a 2002 Renault scenic fidgi 1.4 that i have just bought for my daughter inlaw .The heater fan does not function so i assumed blown thermal fuse . NO ! the unit checked out a1 , But the main red and black wires are not plugged in ??? am i right in assuming they are the main power feed to the fan ???

So my question is where do they plug in ??

i have spent a good few house under dash to find a plug to put them in but no joy .

PLEASE PLEASE can some body help me out .:confused: