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What should I know about the PASS-Key III+ theft-deterrent system?
PASS-Key III+ is a passive theft-deterrent system. This means you do not have to do anything special to arm or disarm the system. It works when you insert or remove the key from the ignition.
When the PASS-Key III+ system senses that someone is using the wrong key, it prevents the vehicle from starting. Anyone using a trial-and-error method to start the vehicle will be discouraged because of the high number of electrical key codes
from here:
MYGMLink Solstice FAQ
PASS-Key III - What is it?