DRL not working / All fuses, relays and bulbs good

[Inspignant]

Just noticed that I had no DRL's when I went to do the mod for the Headlight and DRL both on mod. I have checked both bulbs, good. DRL fuse, good. Relay, good. Light sensor in dash, good. I understand that for the DRL's to work you need to have the engine on and in Drive. What else could I be missing? Last year I installed Xenon HID headlilghts but my DRL's were functioning.