How can I tell if a car stereo's controls can be used with my Android phone? I'm thinking about getting a Pioneer DEH-2200UB, which advertises itself as having controls compatible with iPods. I will be using it with my Samsung Fascinate in my 2005 Honda Civic. Is there any way to tell if a car stereo is compatible with Android Phones (by compatible, I mean the controls can be used to control my Winamp player, or as a last resort, the default player)?

Note: I am asking for a general solution, not one specific to my particular car/stereo/phone combination (though feel free to give me a specific solution in the comments).
If the car unit support the A2DP and AVRCP Bluetooth profiles, it should be able to control your Android music player app; both my Droid (FroYo 2.2.2) and my Bionic (Gingerbread 2.3) honor the play/pause and forward/back controls on my Sony MW600 headset.

The Android 2.3 Compatibility Definition states:


  7.4.3. Bluetooth
  Device implementations SHOULD include a Bluetooth transceiver. Device implementations that do include a Bluetooth transceiver MUST enable the
  RFCOMM-based Bluetooth API as described in the SDK documentation [Resources, 32]. Device implementations SHOULD implement relevant
  Bluetooth profiles, such as A2DP, AVRCP, OBEX, etc. as appropriate for the device.


A2DP provides for streaming stereo content, AVRCP provides for remote control support.


Wikipedia entry for Bluetooth