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Because this is a very strange problem I purchased a Schematic of the system. I will post this for your reference. I specialize in electronic/electrical and I have seen these strange problems before. The window circuit, and the lock system share no common circuit. So normal logic would lead most to think this is impossible. There is a phenomena called ground feedback where a circuit looses it's ground so it feeds back through another circuit, and causes the other circuit to actuate (sometimes erratically). So the two systems are totally isolated, except that they both share a common grounding point, ground G201 near the right side of the instrument panel. The lock system has a total of 4 grounds so if it looses G201 it can still function, at least partly. At G201 where the window, and lock system ground wires meet, I believe that there is a bad connection to ground, and the window switch tries to ground through the lock circuit and actuates the locks.

The best fix is to locate G201 and clean and tighten the connection. The only reference the Mazda repair manual gives to it's location is near the right side of the instrument panel. If you have any more questions I am here to help. Good luck, and Thanks for using Just Answer.

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