Circuit/System Description
WARNING: This page is about a different car, the 2018 Chevrolet Trax and 2018 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
When learning the security code, as well as the challenge and response sequence, the engine control module is placed in learn mode. Once the security code and challenge/response are learned, learn mode will be exited when the engine is successfully started.