The recall includes 1.3 million vehicles in North America announced earlier in the day by Toyota's U.S. unit, along with around 625,000 vehicles in Europe, 434,000 vehicles in China, 177,000 in Japan and 307,000 in other regions.
The automaker said it would add resin covers to the metal seat cushion frames on all affected vehicles to prevent any metal pieces from cutting the seatbelt in the event of a crash, after it had received two reports in which rear seatbelts separated following crashes.
Toyota said it could not determine whether these incidents were linked to any injuries or fatalities.
Reporting by Naomi Tajitsu; Editing by Kim Coghill)