I have an '07 G6.
I just got an aftermarket XM receiver installed by Best Buy with the advanced installation option. For those unfamiliar:
"FM Modulator (sold separately) is hard wired to audio system, antenna is routed and concealed, and tuner is mounted with bracket (sold separately). Power is provided from behind the dash."
After this installation, the doors now LOCK when the key is turned to the off position after they had unlocked from putting the car into park. Before I go back to Best Buy, I would like to have some clue of what they did.
Any help would be appreciated!