Just want to update this for anyone that it may help.
Code 19
Its the black and red wire off the ecu, side stand switch, neutral switch, and the main switch is inline no where on the wiring diagram does it show this on the 12 or 14 diagrams and any i suspect for security purposes.
The main switch is inline first, so if you have a code 19 and the bike wont start in neutral i would test the main switch its the 2 blue wires.
Mine was very dirty and wouldn't make a good connection occasionally. Lucky you can drill out the 2 security bolts on the bottom and clean/regrease the main switch contact and or tumbler. (do both)
Just wanted to make this know. I had to do a bit of research and testing to sort this out. It could be a issue for a few bikes down the road especially any that see dirt, hard weather, or even some age. Ive seen a few people say that some dealers couldn't sort it out either.
To sum it up!
Code 19
The main switch has 2 blue wires inline with the black and red wire off the ecu before the starting relay. You wont see it in any of the wiring diagrams that ive been able to find.