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There is a page with helpful information as to the disarming of the alarm by entering the vehicle with your key, locating the valet switch, and pressing it briefly to disable the alarm... and, that the number of presses may have been changed from the default 1-press. Here's the page:
Is that of any help? try it all, carefully.
If it does not help, then let me know, and we will pursue options further. (Also let me know whether you identified the valet switch for certain, among the three types shown in the illustration linked from the page.)