I just had the viper 5901 installed in my 05 max and if I start my car with the key all my heat settings are as I left them when I turned the car off. BUT if I start the car with the viper my heat defaults to the floor kind of defeats the purpose of trying to thaw out your windshield of ice in the winter. There must be something im missing.
Funny thing is if I start the car with the viper right after shutting it down with the key my initial heat settings are still set. But if I wait ten to fifteen minutes and start it again with the viper it defaults to the floor.