You're trying to make the stock system do something it wasn't designed to do. Those BT modules are mostly garbage; never seen one work as well as built-in BT. Just buy a real head unit that includes BT; you don't have to spend a lot of money.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |