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Thanks for the tip Doc. Since I had access to the cables, I checked them as well as the motor for dead short. All seemed well. After my post, I had some more time to dig deeper and managed to find a "Current Sensing Power Step Control" circuit board. It was burried in behind the switch and a bunch of wiring in cabinetry to the right of the passenger seat.
I had recently seen the step operate to the up position. I reversed the outputs from the circuit board to the motor and fed it a signal. Bingo, the step ran to the down position. Actually the signal was nothing more than a ground. The circuit board uses two wires to the motor and reverses the 12v depending which side of the switch in pushed. It took a few jumpers and four hands - but problem solved for now. The parts chase is now under way.
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