read the ( optional lmc5 modification procedure ) from this document.
https://www.corvetteforum.com/forums/attachments/c5-general/48101532d1496951723-brown-wire-lmc5-lmc5-page-204222015-2015_04_23-02_38_30-utc-.pdf
I installed the lmc5 few month ago, i did the regular connection and still had the pull key message, so i did the Brown wire connection and every thing is working well. You shoult go right away with the Brown wire connection.