Do these mirrors plug into the factory wiring harness?

Yes. These mirrors connect directly to your Tacoma's existing door panel switch and wiring. No rewiring needed—they integrate with your stock electrical system.

Do I need to remove the old mirrors to install these?

You'll need to remove your factory mirrors from the door. These bolt in at the same mounting points. Basic hand tools and maybe 30 minutes per side. No drilling or modifications to the door itself.

How long does the heating element take to work?

Heat activates as soon as you toggle the switch. In freezing conditions, expect condensation to clear within a minute or two. Actual defog speed depends on outside temperature and humidity.