The 2015 Corolla Ascent Hatchback, uses the LED HB4 Plug. I purchased an upgrade kit from Auto One Malaga, called LED Autolamps ($90), which has plug and play fittings for the light connections.
After installing them myself, I've adjusted the height of the lights slightly higher, by using the height adjustment screw with phillips screw driver, after selecting the zero position on the light height adjustment dial on the dash.
The light emitted is 5000 Lumens which is three time the light given out by my old lights. It's a real clean white light.
If you get these lights, you will notice a huge increase in visibility on the road.
Enjoy!!
Paul-John