Will this plug directly into my existing wiring without modifications?

Yes — this is the factory OEM mirror, so it connects to your stock wiring harness and switch panel with no adapter or rewiring needed.

Is the glass heated the moment I turn on the vehicle, or does it require the defrost function?

The heating element activates through your vehicle's defrost control. It's not an automatic feature — you engage it manually like any factory heated mirror system.

What if the power fold or heating doesn't work when I install it?

Test both functions before final mounting. If either fails immediately after installation, the unit may have a defect in the electronics — verify all connector seating first, then contact support if the problem persists.