OK so, you can see where the BT module is located if you look at page 15 of the AV section of the service manual:
http://www.nicoclub.com/service-manual?fsm=Leaf/2014%20Leaf/av
Referring to p15, there is an item B called out with a detail section showing item 12 which is the BT module with the...
Glad you got your install nearly done, now the fun part, as I found out, was getting through phone buttons to work...
... If you look at the vehicle specific instructions available from PAC (the other steering wheel control brand available), they give you detailed instructions on wires that...
Pereze! Thanks for all the info you put together! I have installed new stereos and systems in every car I have ever owned and this one has had the least information available of any of them. And with trying to integrate the reverse camera, steering wheel buttons and everything else your info...