Chevrolet Repair: Fog light

Question
I have 2002 Mercedes E320 I've check almost everything from relays to the PSE pump and switch but it still on while everything are off. Do you have any idea what it could be? Thanks

Answer
Hi Albert,
I assume that you are talking about your fog light is staying on. The only thing  this could be is that the light is hooked up direct. Not sure if this is the factory or aftermarket light? Please let me know more about the problem. Thank you
Jeff