My 2003 Blazer 2 door 4WD radio stays on when the ign. key is removed! Then when I open the door and the dome light activates, the radio shuts off like it should when the key was removed. All else is shutting oof. Only the radio stays on. What could it be>

 

Its supposed to do that don't worry. Its so you can listen to music if you take the key out, until you open the door. After like 5 minutes if you don't open a door it shuts off

My 2001 blazer did the same. Along with most all Chevys after 2000

 

You can also roll the windows up... (I always forget until I reach for the door handle.)

 

I have had many Chevy's and GM's over the years and because they were older models, none of them did that! I now see the General was being kind and considerate and throwing a few tidbits to the troops. My 2003 Blazer is a lot newer than my good old 1994 Impala SS, so I am learning new systems like the DLR and so on. I see the wisdom in the design and like it now that I understand it. Thanks to all that responded. Jim in hot and humid SC.