download Nissan Lafesta Owner Manual. U will have to figure out if ur crank is stripped or ur regulator is stripped u will have to remove ur crank. To remove ur crank u need a 90 degree pick push on the door panel in and u will need to find the closed end of the clip. Then put the pick under the clip pull it off. Remove the clip get a pair of vise grips carefully lock them on and use it as a crank. Now u can see if the regulator is stripped and make sure it isnt all bound up. Let me know on that one. Now to ur horn u said ur fuse is good.U will need to remove ur driverside headlight assembley the horn is underneath it. download 2015 Harley Davidson Flhx Motorcycles Service Manual torrent.

Remove the verticle bolts holding it in remove the headlight u will need a test light or volt meter now. Unplug the horn look at the connector it will be labeled a b c.A will be power all the time thats the wire from ur fuse.B will be the ground trigger from ur horn switch meaning it will become ground only when u press the horn button.C will be gorund all the time. Let me know what u find there. So the window shaft turns but the window goes no where?To replace the regulator u have to remove the inner door panel there are some visible screws u have to remove u can remove the door lock switch with a pocket screwdriver if u have power locks if not same way to remove the plastic filler where the switch would be. Then u can reach the lock rods etc to take them off.