Will this plug straight into my factory wiring?

Yes. This mirror uses OEM connector and harness compatibility—plug it into the existing mirror control module without rewiring.

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

You'll need to access the mirror mounting from inside the door. Removal of the inner door trim panel is standard for mirror replacement—your service manual covers the procedure.

What if the signal light doesn't work after install?

Check that the connector is fully seated and the factory fuse for the mirror circuit hasn't blown. If the light still doesn't function, test the bulb in the mirror housing—replacement bulbs are available separately.