I have a 2005 Bonneville GXP that is having an issue. When I shut off the car and open the drivers door the power to the radio sometimes does not shut off.
It is an intermittent problem. Any Ideas on how to fix this? I'm assuming the door latch switch is inside the door and controls this?? Anyone'* help would be appreciated.

Do the interior lights turn on when you open the door?

No they don't. I just tried them, since I never noticed it before. I have 4 cars and only drive this one once and a while, but I love it! It only has 38K miles.

Door switch is likely an issue.

I agree, door switch

Would anyone have a part number or know where I can obtain this part? I don't believe its called a door switch.
It'* for the driver side, front door of a 2005 Pontiac Bonneville GXP, 4.6

Door latch and ajar switch... ACDELCO15110643.
I found it on Rockauto.com

Thank you Mike. I appreciate your information and expertise.

Keep us posted should you do replace it.