I'll second DDPalmer on that one, I personally have a GS300 and the
location and procedure is identical, problem was the manual that
incorrectly indicated I should be able to see the button.  Instead as
DDPalmer indicates, it looks like a punch-out indent located right in
front of your right knee, and you need to reach behind that area to
find the tire pressure reset button.

Speaking of manual, I noticed too, there are several minor, yet
annoying miscues stated there.  Problem too, most dealership sales
people or service technicians are almost totally devoid of answers, at
least they have to ask several other colleagues and sometimes cannot
come up with an appropriate answer.

/N.