Driver's side DRL on 2007 Subaru Impreza not working

[pjospn13]

Hi, only the passengers side DRL seems to be working. All other lights are working, except the driver's side DRL. I've replaced them before, it doesn't seem to be the bulb that's the issue. Not sure what the issue may be, or how to check? If both were out I'd think there was an issue with the fuse, but it's only the one light.