I have to take my pet to the vet and I'd like to be able to leave in the car with the cabin heat on while I stop at the store on the way home. He has been sick and I need to pick up some supplies for him. Has anyone figured out how to leave the cabin heat on while the car is unoccupied? We had no trouble leaving the heat on while the car was occupied by a person. He is a small elder dog and doesn't weigh enough for the seats to assume that there is a passenger in the car. I'm not even sure if that is the information that the car uses when determining whether to allow the cabin heat to be on or not. Anybody figured this out?