locking has no effect on the cars battery performance. sub-urban legend...

What happens overtime when you dont lock your car, is that the car goes to a deep sleep mode. In which, when the next time the vehicle is woken up, some K-Can subscribers do not wakeup completely and communcate to the BUS, and when there is a delay such as this, it registers it as a fault in the energy histogram saying, one or more k-can subscribers failed to participate in the energy diagnosis. This causing a false battery discharge warning. In order to correct this on e70 vehicles, you must perform an energy diagnosis, and clear the fault memory. Drive the vehicle approx 1 mile, and park and lock the car. Wait 16 minutes, and then the battery discharge check control will no longer be on.