Welcome to the forum.
Look up the switch removal at How To Remove Door Panels On A 2002 Chevy Suburban - 2000 to 2007 Model Years
On the switch where the gray 2x6 connector plugs into, make a note of terminals:
, DK BLU wire, normally ground, gets positive voltage for driver window up
, DK GRN wire, gets accessory voltage (hot with key in accessory or run)
, BRN wire, normally ground, gets positive voltage for driver window down
Unplug the electrical connector and then check the resistance between terminal A
with the switch at rest
and between terminals A
with the switch in the driver-window-up
position. Ideally the resistance values should be zero.