You said you had 12v??? What you need to do is check if the voltage is coming when the button is pushed can't remember which color wire but at rest it should read 0V. One guy holds the meter leads another pushes the button, either inside the car or the remote. That's when you will see the voltage shoot up to 12v then back to zero. If you have that voltage then maybe your ground wire is broken instead of the power wire.
Check out my old thread when this happened to me look at the pics :http://www.bimmerfest.com/forums/sho...d.php?t=616233
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Last edited by Nitrogen; 02-20-2013 at 10:33 PM.