[Highlander4744]

We had the same intermittent step issue recently.
The “usuals” all checked out ok…motor, controller, ground, and door switches.
When I then checked the step relay…located in passenger bay 2, I noticed a wire in that module (don’t know what it is formally called) that the relay plugs into had “arced” making the module suspect. Fortunately, I had a new module that had come with a new relay from Newell. I changed the module out, plugged the relay back in and steps have worked fine since.