You can open a rear door manually (if equipped) in the unlikely situation in which Model Y has no power:
Remove the mat from the bottom of the rear door pocket.
Press the red tab to remove the access door.
Pull the mechanical release cable forward.
Note
Not all Model Y vehicles are equipped with a manual release for the rear doors.
Opening the front doors seems easy enough in the user manual, but opening the back doors requires you to remove a hidden panel then pull a cable, but not all versions of the car even have that hidden panel. Assuming the one in this article did, the car owner would need to give a little safety briefing to every passenger if you want to expect them to know how to open the door. And I’m really not sure what you’re expected to do if you have a kid in a carseat in the back.
Opening the front doors seems easy enough in the user manual, but opening the back doors requires you to remove a hidden panel then pull a cable, but not all versions of the car even have that hidden panel. Assuming the one in this article did, the car owner would need to give a little safety briefing to every passenger if you want to expect them to know how to open the door. And I’m really not sure what you’re expected to do if you have a kid in a carseat in the back.
The backseat of a Model Y is like the world’s worst escape room