turn signals and hazard stopped working in my 2011 Honda accord V6 sedan. What could be the problem?

Probably blown fuse. Under hood fuse box #9 fuse should be a 15 amp fuse.(hazard) page 412 of the manual. Unhook trailer lights prior to replacing fuse.

Accord 2.0 Tourer, 2011 "Born" with trailer-hook (and cabling), all factory installed On recent routine-check, my turnsignal / hazard lights ON TRAILER wasn't working anymore. Checked the bulbs, both OK. Cheked wireing and connectors, all OK. Checked the instructionmanual for potential fuse; couldn't find any fuse for Trailer-turningsignal. My Accord has got no less than 3 fuseboxes, which is a good thing - there is fuses for virtually EVERYTHING in that car, you name it. Except for Trailer Turnsignal, that is. Just to be on the safe side, I checked ALL fuses in all 3 boxes, one hell of a job, especially the fusebox inside the drivers side - you have to be a flippin' acrobat to get to those fuses ! Anyway - all fuses checked, all OK. Still of course, no power for the turnsignals on Trailer. Next stop : The car workshop. They found a hidden fuse, mounted on the cable to the interfacebox for the turnsignals to the Trailerconnector, all of which appearently are behind the Audio-system (bass speaker) in the trunk to the right. No mention of this fuse ANYWHERE in the documentation what so ever. Thanks HONDA; keeping that secret so well just cust me a bundle. But HEY ! I've got a working turnsignal on my Trailer now. Both sides ! How about that...