Will this plug directly into my existing wiring?

Yes. This mirror is wired to match your factory harness connector — no rewiring or splicing required. Connect and test before final installation.

Do I need to remove the door panel to install this?

You'll need to access the door-side mounting points. Refer to your service manual for door panel removal steps specific to your year — it's a straightforward job with basic hand tools.

Does the heating element work independently from the power adjustment?

Heating operates on its own circuit through your rear window defrost switch or climate control, depending on your model year. Adjustment controls remain separate.