Ok, 2nd thread on this particular truck, once again posting for posterity. So this is on my barn find 52k mile 2000 model. Had a bad ECU that caused a persistent P1552 code, so I swapped in ECU/BCU combo out of a different truck I scored a while back. That particular combo ran fine (no P1552 code) but the BCU would not put the drivers window down. Checked out the wiring, switches, etc. Finally swapped in the original BCU and it worked fine. Just my luck. Oh well, will have to get another set somewhere.