Safari DRL (Day running light)

Good day all, you may have seem my previous post about my new GMC Safari 2000 Cargo van that I purchased. Another thing I have noticed
once the car is running, the headlights+ parking lights SWITCH have no effect on the lights at all.
Once the van is running, all lights are ON (headlights+parking lights). Does not matter if it's night or day there are always on.
There is a dome light overide button, the light switch and a dimmer button, is there anywhere that I could bypass the automatic mode of the lights?
What could cause this?
Thanks again, Ben
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.