You said you checked ALL of the fuses?
From what I see, the Drivers Door Lock and Unlock is powered from DR LOCK Fuse 20A, located in Fuse Block-Left I/P.
The other three doors are powered from LOCK Fuse 15A and UNLOCK Fuse 15A, also located in Fuse Block-Left I/P.
Reference Helms 2002, pages 8-1059 & 8-1060.
02 Chev 2500HD Dmax/Allison X Cab LB 4WD
Attitude, Monster Exhaust with Big Head, Michelin 265/75/16E LTX M/S on Alcoa Classics for summer hauling, Cooper Discover 238/85/16E M/S on PYO's for winter, B&W Goose Hitch with Companion 5th Wheel, Highway Products Tool Chest, Jordan Ultima 2020, Frederico sway bars front & rear, Air Lift SD Bags