2010 Toyota Sequoia Owners Manual - Page 753

1-3. Adjustable components (seats, mirrors, steering wheel) Second seats Align the head restraint with the installation holes and push it down to the lock position. Press and hold the lock release button when lowering the head restraint. 1 Before driving Third seats Align the head restraint with the installation holes and push it down to the lock position. Press and hold the lock release button when lowering the head restraint.