Toyota Boshoku Corp., which is based in Japan but is not part of the giant automaker, will locate the plant and its 200-plus workers next to a Total Interior Systems-America plant it operates in a joint venture with Lear Corp., according to the Indiana Economic Development Corp.
Total Interior Systems makes interior parts for the Sienna minivan that Toyota assembles at Princeton.
It wasn't immediately clear which vehicle-the Sienna, Tundra pickup truck or Sequoia sport-utility vehicle-made at the Toyota assembly plant will receive the seat frames.
The state offered $2.4 million in incentives for the plant, which is scheduled to open in 2009.
Gov. Mitch Daniels received a commitment on the deal during his trade mission to Japan last month, IEDC said.