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Zener diode and resistor help

In my learning about Zener Diodes, I took apart a hand control. Looks like it may have been on a chair, or bed of some kind. Here is the schematic.

I don't have voltages etc. for this control.

Could anyone tell me what the resistor and zener diode would be used for. I know this is a vague question, Im just grasping for answers