Will this mirror plug into my factory wiring harness?

Yes—this assembly uses factory mounting points and electrical connectors. Plug directly into the existing harness without modification.

Does the heating element work independently or only when the car is running?

The heating function operates only when the engine is running and the heated mirror circuit is activated through the cabin controls.

What condition is this mirror in?

Product condition is not specified in the listing — confirm with customer service before purchase if you need a particular grade (new, refurbished, or used).