Use Google Now as a Voice Dialer replacement when pushing "call" on car head unit My Samsung Galaxy S running a CM 10 nightly opens the "Voice Dialer" application when i push the "call" button on my car radio head unit. Both are connected via Bluetooth.

As you might expect the Google Now voice recognition is far superior.

Is there a way to:


Open Google Now when i press the call button 
Also use the cars microphone for voice input


Thanks for your help!



Edit

I believe the issue is similar or the same as this http://code.google.com/p/android/issues/detail?id=38566
Unfortunately Google has only given it Priority-Medium.
Go into settings -> apps and click all.  Then find voice dialer and disable it.  That should disable the voice dialer app and Google Now should come up when you press the call button. If that doesn't work you can always reenable voice dialer.