WEIRD NO START NOTHING ISSUE,

[JDCHHINA]

Hello everyone, im working on a 2017 discovery, it kept showing the fault for low washer fluid, we changed the float, still the same thing, then all of a sudden vehicle only started intermittently like 2-3 times, after that nothing now, no light on the dash, flashers work and seats move sometimes but nothing on the whole dash, no infotainment, battery is good, when i press the start button, i can hear a relay click behind the dash. what i uncovered about the washer fluid issue is, and it might help somebody else too, the line that goes to the rear wiper was leaking inside the car on passenger footboard and everything was drenched, so i thought maybe it shorted something or a corroded wire, but i can check the power and signal going to the connector on the driver side a pillar for the instrument cluster but it wont light up, wont even show milage or anything when opening the door, which it should. does anybody have any clues, i dont hear anything from the rear junction box as it has inbuilt relays and is the main junction box to power stuff, checked all the fuses, all the main wiring i could think of, if anybody has anything i should check for, would be highly appreciated.

fult codes from instrument cluster are u055, communication bus d off, but does the bcm send this can signal straight to cluster or it sent via junction box?
thank you!

 

[DieselRanger]

Check the earth / ground terminal at the battery in the rear compartment. There is a known "bad earth terminal" problem in some vehicles (seems it's more of an issue in non-NA cars but hard to really tell). The problem causes parasitic battery drain and poor charging.