That's a new one! Previous posts, on several boards, suggested 60F.John
Is it below 45°F? That is the minimum temperature they will come on or as said, left grip is first spot to check. Use the repair manual.
Fuse 11 supplies power to the relay coil and the controller but the actual power for the heaters is fuse #29 which goes through the relay contacts then to the heating elements themselves. The controller varies the ground to control the amount of current flowing through the heaters.The 5 amp fuse,#11, comes from the ignition switch and should only be hot in the "on" position, not the run position. That fuse supplies power to the heater relay coil and the heater control module.Fuse #11 should have power coming into it from a blk wire in the fuse box. After going thru fuse#11, the power leaves via a red wire with a blk stripe and goes to the heater relay and the heater control module. Since fuses 12,13,14 and 15 are all powered by the same wire, if those fuses have power, the blk wire is OK. It could be a connection to fuse #11 from the black wire behind the fuse box or a bad connection of the fuse blade to the fuse box female connector. You could hot wire the fuse#11 direct to the + battery terminal to test the system. If fuse #11 is the problem, the system should then work.