Bluetooth is a "profile" based wireless protocol where devices must support the same profile on both ends to be able to communicate using that feature.
Headset is a mono two way connection supported by most bluetooth devices, including Phones and Car Stereos, most do not support the Stereo A2DP profile. Without this support on both ends you cannot transmit bluetooth music to the HU.
If your HU has bluetooth then it should also have USB, iPod or RCA inputs - I would connect the iPod to those wired inputs. If it supports the iPod through the ipod port on the bottom (the custom Apple connector, not the headphone jack) then you will get (should get) the added advantage of charging the iPod in the car.
The only way this port will not charge is if it is older than the iPhone - apple changed their charging from the Firewire power pins on the dock connector to the USB ones around the time of the original iPhone and since the firewire standard seemed to be easier and cheaper to manufacture a lot of companies used those wires for power in their iPod connections.
If you have more questions reply or PM me and I will be happy to help.
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