Not familiar with the escy but you will have a master switch in the door, or on centre console etc.
This is your first port of call as it is the one thing common to both front windows to control all four from drivers seat.
If it is anything like sierra it uses a series of power rails inside switch itself to move power where needed, if back ones working you are getting power here, so investigate switching arangement first as it is unlikely that two fronts packed up together.
tabetha