Does this mirror plug into the existing harness, or do I need to run new wiring?

It uses the factory mirror wiring harness—your Titan already has the connectors and fuse circuits in place. Unplug the old mirror, plug in the new one, and you're done.

Will the heater work automatically when I turn on the ignition?

Most Titans route mirror heat through the rear-window defroster switch or a dedicated mirror button on the dashboard. Check your owner's manual for your model year to confirm which control applies to yours.

What if the mirror glass is damaged after I receive it?

Only the complete assembly is included—the glass cannot be replaced separately. Inspect upon delivery; damage claims must be filed within your return window.