Now I'm more confused than ever are TCU from Nav/DSP/Premium different?
Been reading dozens of bluetooth threads and my brain has been turned to mush.
I've got an early 04 E53 (Production 5/14/04) with S639A Preparation f mobile phone cpl. USA/CDN and S676A HiFi - No Nav, No DSP.
From everything I've read, my TCU won't actually do bluetooth, but a swap with a newer TCU should be plug and play.
Are there differences in the TCU's on Nav and/or DSP equipped cars?
Can I get a TCU from any 05/06 E53, E46, Z4?
Many thanks
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