Default Bluetooth problems

I have a strange problem with Bluetooth and my car. It paired with the stock rom, but I haven't been able to pair with either bad seed or viper. Also, it pairs with my pebble, but not my car. I have not updated the radio or firmware to the newest ota. I did find a post about changing HTC mini+ to Bluetooth, but that has not fixed the issue. Anyone have any ideas? Is there a trick I'm missing?

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