This just happened to me. I was about to load some household trash from the garage into the LR4 and I got the dreaded “nobody’s home” response when I pressed the lift gate button. No click or anything.
I broke out the IIDTool and sure enough there was a fault code for a short in that switch. I cleared it and the lift gate worked just fine. I still need to determine if there’s an underlying problem back there, but as you said, it got me back in business in the moment.
Mine just went south also - interesting that you could fix it with the tool - I had to climb back there and break in, replaced the switch, and motor.