I've had similar problems in the past. One thing that's worked is to get underneath, and VERY IMPORTANT...position yourself that when the steps go out your head or arms aren't in the way!!....then unplug any connection that you can find and check for good contact and plug back in. This is especially true with the square looking plug which has 4 wires in it. I've tried a quick squirt with WD-40, and also used a small amount of dielectric grease. Sometimes I've had to do the unplug/plug dance several times, and then it worked. If I'm on a trip and this happens, when I get them working I leave the 4-wire plug unplugged with the steps in the open position until I get home, and then play around with it in the driveway.
