My radio does not shut off when i shut the car off and open the door. im affraid the battery is gonna die in this cold weather. is it possible its something with the door sensor? i seem to remember gm had a feature that if you shut off the car and dont open the doors that the radio will stay on for like 15 minutes. i think thats my problem is its not sensing that the door opened so it just stays on. i shut the radio off and the clock stays on. when i come back to the car i believe the clock is off so its shutting off after 15minutes. but i just got it i havent had much time to test it.