Problem with daytime running light on 2004 Mercedes-Benz CLK500

One of the daytime running lights is out. I have changed the bulb but it still doesn't work. Someone mentioned to me that it may be a module controlling the light. Is there a module controlling this light and if so where is it located?

Asked by for the 2004 Mercedes-Benz CLK500
Which running light is actually out? I've found it can be more than one lamp out and only one was replaced. Be sure to check the license plate lamp as it often gets missed.