Quote:
Originally Posted by Lil Abner
Stupid question, but did you turn the key to the ON position to test it? It will only turn on in that position.
Otherwise, if black is connected to black, and red to white, then you could have blown a fuse trying to install it. 
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To anyone who's not getting power on the existing harness in the FR-S. I was having this problem too.
After checking all vacant spots in the fuse box for a possible missing fuse for the harness I consulted with

Lil Abner and he raised the possibility that I might have blown a fuse testing the connector for power.
... and that's where the problem was! I blew a fuse testing the connector

. This is the same fuse that controls"Main body ECU and outside rear view mirrors". It slipped under the radar (no pun intended) because I almost never have to check the side mirrors.
The fuse is in the box under the dash. Be prepared to do some yoga to get there. In any case is a 10Amp fuse (no. 1 on page 279 in the manual)