BT won't pair with device?

[utexascg]

I am having trouble getting my HTC Mogul to connect with car stereo by bluetooth for hands free talking. The stereo I have (http://www.pioneerelectronics.com/pna/v3/pg/product/details/0,,2076_310069882_291159553,00.html ) allows bluetooth enabled phones to connect to it and use handsfree over the car speakers. I had it successfully working with every other phone i've owned however i can't seem to get my mogul to pair with it. Any suggestions? I've tried enabling the bluetooth on stereo to "discoverable" and had my phone attempt to connect but it won't work. I've also made my phone "discoverable" and tried to have the stereo initiate the connection and still no luck.

Any help would be greatly appreciated.
Thanks