HWI Level system warning went on while driving

I have the HWH series 200 kickdown jacks and had this same problem. What I found that there is a mercury switch at each jack that when the jacks retract the switch is tripped and ground wire completes the circuit to turn the light off. When the ground wire is dirty or corroded the light says on even though the jacks are retracted. There is a small screw and ring terminal the has to be cleaned on occasion. Check to see if you have a similar switch.