530i electrical issues

[thedoc5]

my 2002 530i was recently upon start up the lights would flash, steering wheel went up and down and the radio cut on and off, also vanity lights don't work. Research said it was the ignition switch so I replaced it and as of 1 day later the lights are not flashing and steering wheel not moving up and down anymore on its own, but the other issue still exist ( seat heaters not working, radio works but cant read the numbers, vanity mirror lights don't work, airbag light on..
what can I check that is connected to all these devices????