That's interesting your 17 doesn't have the 726-41-02 line, as my 16 Limited EL has it and I did the change to stop the double honk. It also appears to stop the horn from honking at all when the engine is running. Meaning when I leave the vehicle and double punch the fob lock button, I do not get a honk signifying the car is locked.
On the secure idle, what is the "change to" number in 726-42-01? Is the "1" the correct number to enable it or is it something else?
I also have the line. Are you in the correct Module?
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