Went out to my truck yesterday morning and started it up and turned on the seat warmers then shut the door. Came back a few minutes later and couldn't open the door they were all locked!!!! I was locked out of the house too 'cause I locked the door and walked out. I don't remember doing it but I must have hit the manual door lock slide thingy and closed the truck door. My Onstar had just ran out two weeks ago and I didn't renew it Som beaach!! Any way when I got the truck open I tried to lock the doors by hitting the door lock button...as expected it unlocked the door automatically...so then I locked it manually and shut the door (this time I was inside ) the locks didn't open automatically. Soooo don't manually lock you doors while the truck is running!!!