Don, King of the parts diagram
MY11 WRX STi Sedan 6MT
Fuse 13 behind the coin tray 20amp, if its gone best to see if there is a reason, thats a big fuse to pop.
Would qualify that............
Heated Mirrors and front deicer for RHD are ignition controlled by Fuse 18 (15A) with the relay main battery supply being Fuse13 (20A)