This light, (on right hand drive cars) is to show when the side lights are on, but it isn't used, at least not on the cars I've had / used.
It may of course be something different on a US spec car, (I'm uk based), but other possibilities are, a previous owner / mechanic has had the dash out and put the ABS or airbag warring bulb back in the wrong place, which wasn't noticed until that item has now got a fault.
Do the airbag & abs lights show when the ignition is turned on?, mine shows airbag briefly and abs & also engine management
If not you can try testing the abs when the light is on, make sure no one is behind you, wide road etc.
bulb holders are colour coded to their holes so you can check if it's in the correct hole by removing the dash, easy to do and you don't have to disconnect the wires just to check this.....
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