At a glance
What can fail
The passenger occupant sensor may not be properly manufactured and could short circuit, causing the passenger-front airbag to turn off even when someone is sitting there. The dashboard will show a warning message and the airbag indicator light.
What the fix does
Toyota will mail you instructions to take your vehicle to a dealership. The dealer will inspect the occupant sensor and replace it if needed.
Summarized — see the official notice for exact wording, dates, and contacts.