Does this mirror connect to my existing wiring harness, or do I need to run new lines?

It connects to the factory wiring harness at the door — no new wiring required. Power and ground feed through the existing mirror control circuit in your dash.

Can I use just the heated function without adjusting the mirror with the power motors?

Yes. The heating element and power adjustment operate independently. Run heat alone if you prefer, or use the motors without heat — your choice on the door panel control.

What if the power adjustment or heating stops working after install?

Check your vehicle's fuse box first — mirror circuit fuses often trip if there's a short or overload. If fuses are good and function still doesn't return, test the door panel control switch with a multimeter to confirm voltage is reaching the mirror. Contact support with those results for warranty evaluation.