Did you know that your 2015i Escalade will do this?? Its in the vehicle personalization settings, BUTTTT....there is nothing about it in my main owners manual or the CUE manual....essentially, if you turn it on in the settings you can then use your remote "unlock" button to open all of the windows at once on a hot day as you approach the vehicle....hold the unlock button and they all open ! Once in the vehicle, however, you will need to close each window as there is no "close all window" command.