How do i turn on accessory mode in chevy tahoe?

To put Your Chevy Tahoe into accessory mode You will need to start with the engine off then do not press the brake pedal as You push the start stop button. This will put the vehicle into the accessory mode. In accessory mode all of the electronic accessories will work in Your SUV but the engine will not be running. I recommend not leaving it in this mode for too long because it can drain the battery. When Your engine is not running the alternator is not running either, and that means that the electrical system is reliant entirely on the energy that is stored in the battery.