When I am not driving the car in 3-4 days, the battery is dead, I have to start the car with a booster, then it starts like normal. Checked the dynamo, it works fine, got a brand new ACDelco battery 3 weeks ago, it still drains. I got a message in display last week - "service air suspension", but only once, then it dissapeared. Its a 2003 model. Does anybody have some thougts on what the problem might be? It is sooo frustrating. I appreciate ALL answers and tips. Greetings from Norway!