2011 f150 lariat,mirrors and rear window defrost will not work . Can any body help????

 

Your mirrors defrost are probably working, the light is just not coming on, due to a bad rear defroster. Only fix that I know of is a new rear window.

However; if you do not need the rear defroster, you can just disconnect the rear defroster and go about your business. That's to prevent the rear window from shattering due to the malfunctioning rear defroster.

 

Check to make sure your rear window is closed all the way.