At wits end (check side lights warning)

[dvs]

So i've been getting the check side lights warning and yet all my lights are in working order. My brother says he's heard of the angel eye mod "jlevi" could be the culprit, but i dont know why as they are not sidelights and they are also working.. Guess my question is what bulbs consist of the side lights and is it possible to get the warning and the bulb still work, maybe a dirty connector?

Any insight would be appriciated before i go and change every bulb.