Bmw 318i When i drive in 5 minutes all electrical systems slowly goes down

could be sticky glass guides
or replace the window motor

THE GUIBO IS ABOUT TO LET LOOSE

sounds like a engine sensor i'd guess at the crank sensor but to be sure you would need to get the OBD codes read , this will give the exact fault so wont waste money trying sensor(s) on a hit an miss basis,you can buy a code reader online not expensive just make sure it covers your vehicle make then you have a valuable diag equipment for future use

It might not need to replace the belt but to adjust (tighten) them. Check for a loose one and adjust it. Does the noise changes or stops if the AC is on or off? Or if you turn your steering all the way to either side?

Check the belts first for cracks especially the back of the belt where it rides on the pulley.It sounds to me like one has worn out and may be just spinning causing the noise.Now another problem that will cause that noiose is the tensioner pulley.Check that as well.

Check engine light? If not try changing the transmission filter.

May need a new oil pressure switch,it's located next to oil filter,remove electrical connector then part.You may have to remove oil filter to remove part.

Please refer to the owners manual for red light warning, it can be low oil pressure or hot engine or emissions system. If you don't have an owqners manual you can find used ones on eBay Motors.

try locking and unlocking the car with the key 3 times slowly ,other than that i have no idea ?? another trick is to disconnect battery and join the cables together for a few minutes to discharge any capacitors that may be holding a charge in the computer..Only other thing i can think of is the main dealers who have the right connectors and software to re set it all .sorry i havent been of any help

check the switch on the door pillow cause they do wear cuuseing the window to jump up and down