I'm having some strange problems with the 330

[Curious Joel]

Lately, I've been having some weird problems with the electronics in the 330xi..
1) Last week, I was driving with my lights on when I noticed that the panel lights all over the dash were so dim I could barely read them, including the gauges and radio. I checked, and the dimmer switch was all the way up. I flicked the dimmer switch up and down a few times, and they finally went back to normal.

2) Twice in the past week, I've had a problem with the PDC giving false positives. In the 330, the PDC is active any time the car is in reverse. It can't be turned off.. So twice in the past week, I've had the car in reverse and the PDC was going off non-stop, on the solid tone... It happened when the car was nowhere near anything else, and it still happened after I cleaned the sensors. Both times this has happened, switching the car off, or taking it out of reverse and then putting it back in reverse have had no effect. It will happen over periods of 45 minutes to an hour, during which the PDC goes off if the car's in reverse no matter what.

3) Twice today, I've had a bizarre problem with the gauges. When I start the car, the tach and fuel gauge both remain off.. The needles don't move. At the same time, the temperature gauge's needle goes all the way to the top, and it lights up red. The parking brake light also goes on. This goes away after a few seconds.

Are these just harmless electrical things, or is something going wrong? Anyone have any idea what is causing these things?