Read a few posts on TDR about getting the DRL to work. Stopped in the dealer today to make an appt for warranty work, and asked about the DRL. Lady told me that 'if my truck had the right equip installed'. What does she mean by that? I haven't seen any posts that referenced special equip to support DRL. Its an 07. 5 Mega SLT if that helps. Has a few of the Laramie options also.