Alright, well first post here and i've got to say, i already like this forum better then the GM Fullsize i tried...things are actually laid out and structured.. But beyond that, i'll keep my other comments for somewhere else. Recently picked up a 05 Yukon XL Denali, 178k miles, would be clean if it was cleaned more, but the seats are actually in fantastic condition when compared to just about any other GMT800 with these miles that i've seen. Going through the kinks on her, and getting her back into DD shape. Going to be a spare rig for us, weekend driver, and winter vehicle for the wife. But back to the basics, the driver's seat has no function. Passenger seat has full function. Replaced driver's seat controls on side of seat with a new dorman unit (old controls were broken, so regardless of good or not, they needed replaced) seat still inop. Went under the seat last night with a multimeter, i have good power and ground going to the main connector, as well as the seat controls. That makes me lean towards the seat module. I plan on inspecting it a little closer tonight to see if there is a loose connection or something, but is there anything else i can diagnose while i'm there? Or are there other items i should look into to diagnose before swapping other parts around? I found where i can hot wire the motor to confirm movement at the back of the seat, which i will likely do this weekend. Looks like to replace the module i'll need to pull the seat. I did find a dorman P/N of 590002 which is about $300. Local salvage yard won't let me take the seat module without the seat, and i saw online people programming the seat modules as they might be vin locked? shouldn't it be as simple as finding one with the same options? any help would be appreciated, thanks in advance