I don't think you can do it yourself, it's done through the computer. Some of the dealers are nice enough to turn them on if you are having other work done (e.g., oil change). Based on what I have read, all Challengers come with DRL, but they are not activated if sold in US. My two cents.took my car for oil change, the dealer told that the veh does not come equipped with DRL. i showed them the posts from this forum and they said " yea, that does not happen. we can try but it takes $99."
any way we can do this ourselves?