Easiest fix is cut wire to siren and install switch in wire and turn off if u know its going to rain, sounds like there is a wire exposed that when it gets wet it trips alarm does this happen when running or only when off?
Ask the dealer if they have a water hose. If that's what sets it off, the best way to find the problem is with water. You could check ALL of the alarm system wires for fault to ground but if it's dry, you won't find it.
Have you tried parking your car in the opposite direction?
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