I have a 2002 Odyssey and today pulling into my driveway the following lights came on:
Battery
Parking Brake
Door Ajar

I haven't had any other electrical symptoms before this and these are the only symptoms at the moment. I did have the A/C running and the stereo on, although those were not affected when the lights came on. I turned the engine off and let it sit for a few minutes then turned it back on the same lights stayed on for about a minute or two then turned off. I do park the van outside and there have been a couple of squirrels hanging out in the area if this may help with a possible diagnoses.