possible to change headlights to all turn on???

the LCM(computer) will not allow it.... why do you want them too...?

if you want great lights go with the factory driving/fog lights
fog light come on with low beams, driving lights come on with high beams

 

Is it your truck or a company truck? You don't do modifications to a company truck or you might get charged for it if they find out.

I could tell you how but it requires a jumper wire and a 12V diode to trick the relays. Are you willing to buy one and do some soldering?

 

yep, possible. Low Beam On when Main Bean on parameter in LCM. It is on on all EU volvos

 

Those extra fog/driving lights are annoying, imo.

 

The easiest way is what Pablo says. Have a shop hook the laptop up. I didn't know there was options on that.

 

Yes they are...also illegal in Georgia except in inclement weather. IE: Fog, Heavy rain.

 

judging by the number of car's I see at night running them Georgia isn't stopping people for it