On the NNBS trucks, the horn will blow if the hood is opened. This assumes the user locked the doors via the remote.
Nope not on all of them, I know this because one of my techs popped the hood from underneath on my personal truck one day and the horn never went off and I always use myremote to lock the doors.
At work its the same on all of our 2007-2013 Silverado LT extended cab service trucks too.
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