Hi! Throwing this as a last resort if some1 has any insight to what my problem could be. Picked up a 2007 scenic for grandpa after his old one decided to lose compression. So the problem is when you press the starter you can hear 1 relay clicking but no power comes to the dashboard and the thing wont crank. OBD port is dead as in nothing wont connect to it(CLIP or general scanners). I've identified it to be the a large red one right under the dash that has a large red wire and a large yellow wire that appears to feed the passenger compartment fuse box. The car was missing the uch when I got it so I fitted one that we had laying around, this brought life to the interior electronics as expected and the central locking when using the key that was programmed to the car which the uch came from. I've checked every fuse and relay that I can find(UCP(except the relays soldered to the board), interior fuse box, battery fuses, large fuses under the ucp and the ones under the drivers seat) and everything is in working order and has power. Haven't done the light bulb test yet to see if there is a short somewhere. I've inspected pretty much every wire I can find under the dash and in the engine compartment and none of those seem damaged or melted. I've got a full set of electronics from an older model(ucp with black cover plastic where as this one is white) with all the modules and wiring harness so I could swap those in and make it run with them but Id rather not go through that whole process 😅. Any tips are appreciated!