VBtruk,
I don't know about your truck, but that white and purple wire on mine did absolutely nothing when I applied power to it or grounded it. The mirror grounds the white and purple wire when the lights are supposed to come on. I ended up having to put in two relays in mine to get the autolamps to work. One thing though, I have to rewire the door chime wire because when the autolamps are on after turning the truck off the chime goes off until the lights turn off or the door is closed again.
I had a look to see where that white and purple wire went on my XL, but couldn't follow it, or gave up. My EX has no RAP in it, but there is a relay box in the jack compt. as well on mine. No W/P wire there, but there is an audible click from it when you turn the parking lights on. Why? I don't know. So that is why I had to wire up a couple of relays. I still haven't done a wiring diagram for it yet, and probably won't be able to because I am going to be away for 2 weeks as of this monday.
If you know how to wire relays, it is simple.
Hoppy