I get it from my fog lamps, one of them always seems to come on "late" like after hitting a bump (probably a bad bulb), took a few times of getting out and finding the bugger as it would usually be lit after driving.
I have the same problem with all the lights seeming to work, including the license plate lamps. Here's the kicker, I hit a racoon a while back on a highway, going about 75 mph and it broke the bumper where the foglamp is on left. That's when the indicator came on first, but I've replaced it and the indicator still comes on at random times.
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