I have a 2003 540ia with a strange electrical issue, can anyone shed a
little light on the problem?
Here are my symptoms: Every so often (ie: once per week) my 540 has a
total loss of power. Even the orange light next to the "P" is not on.
Absolutely no power, nothing, nada! Several times I have arrived at my
parked car to find the doors unlocked (luckily I park in the garage),
and once it happened while I was driving (l pulled over quickly). After
a moment or two the power is back on 100%, like nothing ever
In an effort to determine what the hell was going on, I opened the rear
battery compartment and "jiggled" the harness to the battery. This
seemed to cause the power to go on and off, and explains why the power
comes back on as I close the door (the force jiggles the harness).
However, I have inspected the harness and battery connections, and
everything seems to be fine...?
I assume there is something I am missing in the harness itself, but
maybe I'm missing a bigger issue. Could the battery casue this type of
symptoms? What about a fuse or other electrical gremlin? Has anyone
else experienced a similar problem?
Also, my air conditioner cuts on and off intermitently (all other power
remains on). This might be a completely different issue, but I wanted
to include it just in case it is relevant to the power loss.