Do I need to splice the electrical connector, or does it plug directly in?

You'll need to locate your vehicle's mirror power and heating circuit and connect this mirror's harness to it. The connector type and splice method depend on your specific wiring layout—consult your service manual or a wiring diagram before starting.

Will this mirror fit if I'm replacing a manual (non-powered) mirror?

Mounting points align with OEM specifications, but swapping from manual to powered may require running new electrical lines through the door. Verify that your vehicle's electrical system supports powered mirrors before purchasing.

Does the heating element come on automatically, or do I control it manually?

Control depends on how your vehicle's climate and mirror systems are wired. Some Honda models have automatic defrost; others require manual activation. Check your owner's manual to confirm how heating is managed on your model.