Seat Belts-Shoulder Belt Anchor; Trunk-Internal Release - Toyota Mirai 2020 Quick Reference Manual

Seat belts
NOTE: If a passenger's seat belt is fully extended, then retracted even slightly,
the Automatic locking retractor (ALR) will prevent it from being re-extended
beyond that point, unless fully retracted again. This feature is used to help
hold child restraint systems securely.
To find more information about seat belts, and how to install a child restraint
system, refer to the Owner's Manual.

Seat belts-Shoulder belt anchor

Trunk-Internal release

Keep as low on
hips as possible
Pull up
45
Take up slack
Too high
Push up, or squeeze
lock release to lower