Hello -- this is my first post on the board.
I have an 05 545i which I've kept mainly garaged and drive somewhat infrequently (2-3 weeks of driving every 3 months) as I'm not in town that often.
Two weeks ago I disarmed the car alarm using the factory key to place something into the car and opened the trunk. I then tried to lock and arm the car using the key fob, but it seemed to not have enough battery juice to do that as nothing happened. I then used my key placed it into the door lock on the drivers side to lock the car.
It manually locked -- but after a few seconds the alarm started going off. I went to find jumper cables to try to jump the car to give it enough juice to disable the alarm and reset itself. It took me 10-15 mins to find the cables, but by then the alarm had stopped going off -- probably because the battery had run out. Since the noise had stopped at least for the time being, I left to do other things as I was a bit in a rush. Unfortunately, I was not able to go back to the car for another week.
Last night when I tried to jump the car. I connected the battery cables (as i had previously done before) red to red underneath the positive plus box and black to the brace between the two towers in the wheel well. However, unlike previous attempts, no power seemed to be flowing into the vehicle. The dash light doesn't come on, interior lights doesn't come on.
I have two hypotheses at the moment: 1) the car disabled? I'm not sure if the BMW has some kind of auto-theft device in it that will cause it to not power-up 2) the battery drained passed its recoverable limit.
I'm thinking that its probably #1... I've been previously been able to at least get power in a vehicle that has been sitting for a very long time with a jumper cable. But, in this case nothing at all seems to happen.
Does anyone have any experience / insight into this?