About 2 weeks ago I’ve started receiving a high battery drain warning on start ups when the car has been sitting for 5 or more hours. The car always starts up and the warning goes away pretty quick but just 2 days ago my locking system has started malfunctioning usually I take full advantage of comfort access but when I walk up to my car it unlocks then immediately locks itself again makes it pretty tricky to get in with company any advice would be helpful!

 

Is the car going to sleep? Do you have a voltage meter? You can check the battery when the car is off and when it goes to sleep to see if power is still getting pulled. You probably found the answer to your problem already with the lock mechanism. If power is still being pulled after it goes to sleep start checking the fuses one by one to see what is staying on. I would start with the fuses that are for the locks first

 

Or you can follow this wonderful thread.... Is My Battery Bad? - 5Series.net - Forums.

 

Back again locking system has gotten worse after I replaced all the fuses for the locking systems I am stumped

 

Why did you replace the fuses. You should be check for a bad module. That is why you do a draw test to make sure the car is going to sleep completely

 

if your battery keeps dying, that will cause a whole lot of other problems (been there). I'd address that issue first.

Did you go to the link I provided yet?