Check and the wiring to the LP Check relay. Also try swapping the Start Relay with a good known one (High Beam, Horn).
its very hard to trace the wiring, will the lp check wiring go straight to the climate control?
I have noticed the top connector of the climate control the orange/white wire doesn't have power, but the bottom connector orange white wire does have power, could that be the problem?
Here is a little diagram:
Top connector (A) - goes to (B) = that is the where the orange/white (power) wire connects to which is dead reason why my main screen isn't working.
Bottom connector (C) goes to (D).
oh and quickly the drivers side electric window has stopped working all the others work fine, when l press the switch for the drivers window l can here it go click under the steering column somewhere??
hope that helps.