Will this work with my factory mirror controls?

Yes, if your Avalon came equipped with powered mirrors from the factory. This assembly uses the original wiring and switch locations. Non-powered vehicles require aftermarket harness routing.

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

The mirror mounts at factory points on the door itself—no panel removal needed. Disconnect the power and heated element connectors from behind the door, unbolt the old mirror, and bolt this one on.

What if my heating element doesn't work after installation?

Test continuity on the heated element connector before install to rule out a DOA unit. If it checks good but won't heat, the issue is usually a blown fuse on your factory mirror circuit or a corroded connection at the door harness.