Car acts completely dead. Security light remains blinking


New member
I have a 2006 M35 and now my car won't start. Key fob not doing anything. Won't start alarm, lock, nothing. Replaced key battery. Still nothing. My security light continue to blink like key is not there. Barely any lights on dash show only asc, slip and the vcs or whatever it's called. Anyone had this problem or know what it could be?
Im completely lost and usually fix car problems 🤷🏽‍♂️

Tried resetting car by leaving terminal off battery for a period of time.
Replacing key battery
New car battery
Checked most fuses. Cant find one that is security related
Any help? Need my car asap