It looks like this:
https://www.rockauto.com/en/catalog/toyota,2005,highlander,2.4l+l4,1434111,steering,power+steering+pressure+sensor,7408
Power Steering Pressure Sensor
http://www.oreillyauto.com/site/c/search/Power+Steering+Pressure+Switch/02045/C0039.oap?year=2001&make=Toyota&model=Highlander&vi=5015975
It has a different name: Power Steering Pressure Switch