When I added a modern stereo with Android Auto/CarPlay to my 2003 vehicle, I found that many modern car stereos are designed to never be turned off. There was n

When I added a modern stereo with Android Auto/CarPlay to my 2003 vehicle, I found that many modern car stereos are designed to never be turned off. There was no off switch. So, if you start the car to let it warm while you shovel the driveway, you couldn't listen to your phone with bluetooth headphones, as it would connect to the car stereo, that you couldn't turn off with the car running. I fixed it by wiring a simple toggle switch into the the power line for the stereo and mounting it in the dash. Problem fixed. "Off" shuts off the stereo instantly. You might be able to read up on your model/package and do this, or consult a car stereo installation shop to do this.