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I got a yamaha DTX 502 drum module and would like to diy a 3 zone drum pad. Search from some threads suggested that yamaha pad is piezo / switch trigger type. I would like to obtain the wiring diagram. Would somebody can help me?

In my opinion it is not worth trying to build such a pad. I have not found any satisfying solution.
Building reliable, durable, working switches is not that easy. And the look of the result is another
reason to me buying my cymbals instead of building them. 2 zone piezo/piezo pads are easy to build.
But you can try your best and let a know about the results.
You would be my hero if you find a semiprofessional looking and of course working solution.