I have a 2013 xc60 type 156 6324S4 engine. When I open my driver door, I hear something energizing. Can someone tell me what that is? If when I open the driver door and I do not hear that buzzing- like sound and I step on my brake pedal to start the car, my car dies (digital instrument panel lights go off). My 3rd 11/23 Battery shows (Fluke) 12.5 static VDC and 14.15 when running and has a new alternator. KEYFOB batteries show 3.1 volts each. I may have to try to start 4 to 5 times before engine will turn over. I can come back from a drive, shut the car down, and try to restart and it will not do it on the first try. If I open and close the door and hear the buzzing sound it will start up. VIDA 2014D indicates with yellow light. I get a B1B6916 error code that says "12V supply circuit below threshold". But with Fluke attached during startup, it says battery voltage is sufficient. I could sure use some help.