Jarro, this is apparently a common issue with your model. There is a TSB out for a fix. You should notify your dealer. For a better information on this as well as a possible fix, check [http://www.clublexus.com/forums/es300-and-es330/505740-05-lexus-es330-rear-window-wont-open.html|on here.] Apparently, following the Lexus forums, this is the preferred fix:"
1. Sit in the seat
2. Open door that window is not working
3. Hold the window button down
4. Slam the door closed