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Thats no lie, the ONLY time it does work is washing the car spraying the hose. Now any time I want to open the frunk I just click the button on the remote. Saves one from standing there waving at the crest looking like a total moron!
The sensor is located under the front bumper just below the crest. If you wave at the crest over and over, you will look like an idiot because nothing will happen. Try waving about 1/2 inch above the surface of the bumper just below the hood crest. One or two little waves and it will open every time!
To prevent accidental opening during car washing, just leave your key in the house.
The only way I have found to get it to open is to lightly touch the bumper below the crest. Works every time. I found this out when I was investigating what I suspected was a stone chip in the paint. It NEVER worked otherwise, no matter how much I waved, flapped, swiped, or flipped-the-bird to the crest.