Thank you first of all to all initial replies offering assistance. Here's where I am at now. Lock still working, Unlock not working. WWe have eliminated the Remotes. Went to the fuse block under the hood. When I depress the Lock button I can here the Parking Light Relay click and you can put you're finger on it and feel it. Nothing happens at the Parking Light Relay when I depress the Unlock. Found the fuse block on the side of the dash panel ,looked at the schematic on the cover , it indicates that thios is where the three relays should, I can see the Five Pin hloes in the fuse block, however their are no relays in this block, not a single one. I am guessing this truck is somehow different than most, I have owned this truck since August and everything was working fine up until about two weeks ago. Was hoping that someone might have some additional input for me today. Frustrated and about to take it to the dealer. Thanks. Mike.