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For anyone interested. I was able to resolve my BT issue. The NAV AHA extension box does have BT. Turns out my box was bad. I found a second hand HU with the NAV box for really cheap.
The stock HU works fine without the extension box plugged in. BT works fine. Once you plug in the ext. box, it must default to the BT on the box (probably due to the AHA integration).
Only bummer is the replacement box has never had the NAV maps upgraded. I had the maps on my old unit updated for free shortly after I bought the car. Toyota wants north of $300 to update the maps and software! It never ends.
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