Windows not functional on ignition switch position 1

My 2018 xc60 went in to try and solve it's stop/start problem. After mechanics tried 'everything' without success, I suppose in the process disconnecting and re-connecting the main and auxiliary batteries, I got the car back but now the power windows do not work on ignition position 1 as they always did before and as clearly described in the user manual they should. Brought it back and after two days in the shop the mechanics just shrugged their shoulders and gave up!

A most annoying situation. (PS: I tried the standard resetting prosedure without success).

All the other functions work as they should on ignition switch position 1.

I will really appreciate some feedback from anyone with a similar prob that has been resolved

I AM WONDERING IF THE CAN-BUS MAY BE A PROBLEM OR THAT A PARTICULAR MCASE FUSE IS NOT RESETTING. (PS: I CAN ALSO NOT FINDIN THE USER MANUAL OR THE IN] WHERE AND WHICH FUSES PROTECT THE POWER WINDOWS. NOR CAN I FIND A WIRING OR EVEN A BLOCK DIAGRAM SHOWING THE RELATION BETWEEN IGNITION SWITCH POSITION 1  AND THE POWER WINDOWS. IT IS VERY STRANGE THAT EVERY OTHER ITEM FUNCTIONS AS IT SHOULD ON IGNITION SWITCH POSITION 1 EXCEPT THE WINDOWS - WHICH FUNCTIONS ON IGNITION SWITCH POSITION 2 AND WHEN THE ENGINE IS RUNNING. OUGHT A DIAGNOSTIC TEST (WHICH THE MECHANICS SAY THEY PERFORMED) NOT INDICATE THE FAULT ? I WAS GIVEN TO UNDERSTAND THAT A SW UPGRADE MIGHT HAVE BEEN THE CAUSE BUT NO SUCH UPGRADE WAS PERFORMED. MY QUESTION REMAINS: COULD MESSING AROUND WITH THE TWO BATTERIES (DISCONNECTING AND RE-CONNECTING) CAUSE SUCH A FAULT ? AND WHERE ARE THOSE FUSES ? AND WHY IS A 'TRACABLE' PROBLEM SUCH AS THIS IN A SOPHISTICATED CAR  BE SO DIFFICULT TO TRACE ? THIS DOES NOT SEEM TO BE AN ISOLATED PROBLEM SO IT OUGHT TO HAVE A SOLUTION.|new_window=true]