I have the newer S2 chassis so things are a little different but on a 2016 this is sometimes caused but a circuit breaker that is installed on the Chassis batteries tripping. To access the batteries, open the drivers door and you will see a removable panel with 3 Torx screw, remove the screws and you can access the batteries. There should be a square black breaker on top and if it is tripped there will be a little red lever sticking out the side, just press it back in. There are also some fuses to check in the Coach battery compartment.

Hello Mr. Nuts. Thanks for all your helpful information.
I have a 2016 Seneca 37FK. The levelling system control panel is just flashing all lights and jacks will not come down. Also the steps will not come down. Would this be an issue with batteries? I am plugged into shore power. If you have any advise I would appreciate your input.