It is quite unlikely, but not impossible, that both switches would fail at the same time. But I don't understand the "together" part of your question. Do the windows work OK if you just operate one at a time? I have a 129 and on that model there is a seperate fuse for each window motor. So, I've had one window fail while the other continues to function. The window switches operate in conjuntion with the top controller. That is, the switches close relays in the controller; they don't go directly to the window motors.

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