2013 OEM Nav Radio Upgrade

Hello Everyone,
First Time posting Here, So let me start off with the trouble i got my self into. I have a 2013 Tundra Crew Cab TSS 4x4 and i swapped the old radio head (NON NAV - NON JBL) unit to an OEM NAV JBL head unit. Now i obviously have a few issues here. I realize i dont have the amplifier....as of yet. But i am hopeful that some one can point me in the right direction in getting my issues resolved. Firstly a wire diagram would be an awesome start. And secondly is there any harness kits for such a project like mine. As of now i got lucky and found a harness kit to allow me to install the old style antenna to the newer style connection on the radio. I have the OEM GPS antenna installed under the dash. And it works somewhat...i have no steering wheel functions and oddly...no volume control...sound seems to be set at 3/4 max! I hope that is not a defect in the head unit and just a case of an incomplete install. Thank you all for any help you can provide.

 

Did you ever get an answer for this? I’m in the same boat so it would be nice. Only I haven’t purchased anything yet.