Yes, most likely. Not to a constant 12v source, but to the blue/white, NOT blue. I have a 2000 323i so it's pretty much going to be exactly like your car, and mine does not have a power antenna. They might have amplified antennas, but not the power kind that roll up and down. So that being the case, you have to hook up the blue/white wire to the blue wire of the aftermarket harness. You have the blue/white lead going to your aftermarket amp correct? Well that is why your sub amp is always playing, but your factory amp is not, you have the power antenna lead going to your factory amp turn on lead. Now you may also have a black/white wire that is a factory amp ground, check that as well. Do you have the harmon kardon system? Let me know what you find out, if you need a diagram I will sketch one up on paint.
Last edited by benzovs; 09-29-2012 at 11:17 PM.