Fuses number 2 & 10 for starters. Also number 8. If these are okay the the signals cancelling unit may be blown (its under the steering stem). Its unlikely that the wheel sped sensor is blown or the speedo wouldn't register so concentrate on the signals unit test. You will need to get to the connector blocks holder under the left side lower fairing panel, Honda say to remove the panel but I can get to the connector by just undoing the screws and pulling it down a small bit and leaving the lower cowl connected.
Disconect the 6 pin brown connector and at the bike side of teh connector (main loom side), check the following with the ignition on;
White/green wire - voltage should register as this is the feed.
Turn signal on (right of left) - check Pink wire for continuity which should be there. With turn signal buton pushed in there should be no continuity. Nowdo the same check on the Light Green/White wire and you should get the opposite results.
Ignition on, spin the front wheel slowly and check the White/Black wire. You should get a pulse up to 10 volts (11 or 12 is okay as well).
Now re-connectthe connector block to check the cancel output.Check the Blue/Black wire and operate the turn signal left or right, you should get NO voltage. Pushing the turn signal switch should see voltage appear. This is the crucial check for your problem. If thistest proves bad then its a new cancel switch.