FYI,
As of last weekend I have the Bluetooth working using the Clarion BLT370 and a custom interface cable that plugs into the AUX socket on the back of the radio
The BLT370 has very good audio streaming and a telephone interrupt when a call is received. The stereo will even turn itself on for the duration of a Bluetooth call.
The only down side is you loose the external AUX input as the streaming function takes over that input. I have tried just putting a "Y" connector in line between the Bluetooth and an MP3 input.
This works, but your MP3 will continue to play overtop of a phone call if it comes in.
You press the "CD/AUX" button for the audio streaming input.
When a phone call comes in, the interrupt will automatically switch the radio over to "TELEPHONE" mode, no matter what source you are using (Radio, CD, or AUX streaming).
One thing I have noticed is that if you are using the AUX mode when a call comes in, the stereo will switch to either radio or CD after the call is finished, it does not return to AUX. you have to press the "CD/AUX" button again to continue the audio streaming.
The interface cable supplies the power for the BLT370 as well.
I have also tried the interface cable with the Motorola 605. The 605 also has very good audio streaming, plus the added advantage of having an external AUX input. The biggest downside is that it requires an external speaker for the telephone call... it does not have a low level RCA output for the telephone (??). I don't know what Motorola was thinking with that one.
The interface will work with the 2007-2009 SX4 and GV. I can also make an interface cable for the 2006 GV, but it will require an external power source for the BLT370.
Cheers,
Tim