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Here is the limited description of both in the online Order Guide:
Theft-deterrent system, vehicle, push button start, immobilizer and audible visual alarm (listed as standard on all trim levels)
Theft-deterrent system, body security content and unauthorized entry electrical (listed as included in 2LT and 3LT)
I'll hazard a guess that the body security etc. is an added shock sensor. GM has these in their Denali level trucks when they first came out. They went away a few years ago.
From: Calgary, AB. There's a reason why white was the only color offered on every year Corvette. Proud Canadian German Jamaican!
St. Jude Donor '09, '12-'13-'14-'15-'16-'17
too bad it doesn't have a proximity sensor and motion detector like the Viper in my '03 vert, with the top down if anyone puts their hand inside without even touching anything it warns then alarms, it's also a two way which I love. Chances are I will be ditching the factory junk and going for another Viper.
Tadge mentioned at the NCM Bash, that the convertible has a sensor detecting motion, so that if someone made a movement inside the convertible when the top was down, it would go off.