I have a 2019 X4 that will not start. I washed it one day and brought it home. When I unloaded the SxS it had a delay when trying to start it, similar to a low battery. It eventually started and I ran it for awhile then parked it. I went to start it yesterday and same thing happen, eventually started. I rode my grand daughter around for about 15 minutes then turned it off. It now will not start. I can hear a slight click and hum sound when I try to start it but starter never engages. I tried jumping it off with my Jeep battery but the same thing happens. Any ideas what this could be? Also how do I get to the starter on this SxS ? Thanks for any help.