My Yaris hasn't leaked yet, knock on wood, but my 03 Echo leaked around the tail lights. I put my grandson in trunk with flash light and gave it a good hosing to find leaks. We replaced foam gaskets under lights and it still leaked, so we removed lights and a bead of silicone on gaskets and it still leaked, but very slight leak. Was never able to completely stop it, some rains it will leak a little some rains it doesn't. Good luck, hope you have better success than I did in sealing it up.
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