battery drains to dead in 5 days

That is for the entertainment and radio systems. If your vehicle has information that you can read via the screen all of that will be gone and the radio will not work as well as some systems like HVAC. My Equinox did the same thing, and it could not be fixed due to no parts being available. So, I had to find an aftermarket unit that would be able to do the same thing and have it installed. Ran about 600 bucks, now everything works as it should except the turn signal sound, I'm going to put a small beeper in the signals circuit to make up for it. Good Luck

How often do you drive it ? Unplug any blue tooth or adapters