On my 2001 XC, the headlights are on full power whether the switch is "off" or "on". I understand that this is how Volvo wants the DRLs to work. I can turn the fog lites on in both these positions as well as the center, parking lites only spot. If I have the DRLs deactivated, (something I understand the dealer can do with a software change)headlights no longer on when the switch is "off", can I turn the fog lites on in all three switch positions? I would probably leave the switch "on" most of the time but occasionally I like to turn the headlights off, and somtines use only the fog lites. Thanks all for your anticipated replies. Tom.

Yes, the dealer can turn off the DRL's without software. No, the fogs won't work unless the headlamps are on.

Well, I don't know if this applies to the XC, but on my C70, I can turn off the DRLs on my own. There is a small knob just beneath the headlight switch that you can turn with a small screwdriver. I forget the orientation but it should be in the manual. As for the fog lights, my foglights can only be turned on the the full "on" position. I'm currently trying to figure out how to rewire the fogs so that they can be turned on with the parking lights on.

Mike H.