hello guys,

I have had this 04' e60 for a couple of years now. i havent been able to pass the smog because there is no communication with the obdii however there is power because it turns on.
I have taken it to plenty of indies and one concluded power is diverting to somewhere else once the smog plug is connection. Others said the airbag safety gateway module is at fault.
I am wondering if a simple BST connection on the positive terminal of the battery is the culprit for my air bad and seat belt lights to be on and therefore withdrawing current not letting the obdii to communicate to the smog certified computer.
I do believe car has been in an accident before due to paint colors.

Next week, im turning in the car to redo wiring on codes;

27c3
cda8
cd95
cda0
29AF

thanks for reading, any input will help.