Tailgate Window Will Not Close From Panel Switch, Otherwise Operates

With ignition switch on, and tailgate door open, place panel switch in "UP" position. Using a grounded 12-volt test lamp, probe terminal for Lt. Blue wire at back of switch. If lamp does not light, replace panel switch.
If lamp lights, probe terminal for Lt. Blue wire at cut-out switch. If lamp does not light, check for open Lt. Blue wire between instrument panel and cut-out switch. If lamp lights at cut-out switch terminal, check Lt. Blue wire between cut-out switch and motor. If wire is good, replace cut-out switch.