If a schematic would help, here is one that may be applicable. It shows both the air and the electrical control schematics. The date on the drawing is September 2004, and it applies to the step covers on the Dynasty series, and others.
It says it is in a box under the step cover. I have never looked for it, and I have never seen it, so it is pretty well hidden.
Good luck!
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Jim & Angie, Boise, ID
2021 Entegra Esteem 27U
2017 GMC Acadia Denali
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