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Apparently this can be caused by a faulty hood latch. Unplugging the connector behind the passenger side latch will prevent the alarm from arming, so use a paperclip to short the plug. This allows the alarm to arm. Wait now to see if this is a workaround for the spurious alarm signals...
Since I have 2 D1's right now, I'm thinking I will go with the single unit one, but don't know if I will need the adapter for the 14cux , not sure what the EMS stands for...