I hope you were able to sort this out.
If not, is there a separate fuse for that slide? Check if it's blown.
Is your battery charged? Slides don't like weak batteries.
There should be a hole for a hand held crank to manually retract the slide. Sometimes located on the opposite side of the trailer. Maybe accessed through the wardrobe. I don't know so maybe someone with a Lacrosse can respond. Or, call your dealer today.
Best of luck and let us know what you figured out.
DW, 3 Kids and our Goldens
2012 Shamrock 233S
2008 Toyota Sequoia 5.7L 4WD