If I remember correctly, 4Runner's that came with DRL from the factory have the ability to be turned on or off by the dealer. If DRL was installed by the dealer then I don't believe it can be turned off as simply. So if your truck didn't come with it, you wouldn't be able to turn it on, but rather add it on for more money if anything.
I'll double check and search through some threads on the matter.
EDIT
Here
something on the matter.
After searching more on the matter, I can see why there's a lot of confusion on the matter. If anything, I'd call up another service department and see what they have to say.
