I have a 93 LS400 and the power antenna keeps running for approximately 30 seconds after the antenna is fully retracted. You can hear the stem grating over the antenna gear in the housing until it finally shuts down. It doesn't appear to have anything to do with the antenna mast as I have installed a new one. I have also taken the unit apart (greasy job I might add)and there is no broken pieces inside or any other flaw that I can detect.
Anybody have any idea? A bad resistor or something?
Thx!