2000 GMC Yukon Driver's Power Window

Hello .. thanks for the donation .. much appreciated There are 2 type's fitted on this year of Yukon, old style and new style !! ... I have included the test's for both type's .... hope this helps .. let me know OLD STYLE TEST 2: LEFT FRONT WINDOW INOPERATIVE Turn ignition switch to RUN position. Using a test light, backprobe between master switch assembly connector C2 terminals "A" (Dark Blue wire) and "E" (Brown wire). See Fig. 2 . Move left front window switch on master switch assembly to UP and DOWN positions. If test light illuminates in both positions, go to next step. If test light does not illuminate in both positions, check master switch assembly connector for poor terminal contact. If connection is okay, replace master switch assembly. See WINDOW SWITCH under REMOVAL & INSTALLATION. Disconnect left front window motor connector. Connect a test light between left front window motor connector terminals "A" (Dark Blue wire) and "B" (Brown wire). Move left front window switch on master switch assembly to UP and DOWN positions. If test light does not illuminate in both positions, go to next step. If test light illuminates in both positions, check left front window motor connector for poor terminal contact. If connections are okay, replace left front window motor. See WINDOW MOTOR & REGULATOR under REMOVAL & INSTALLATION. Check for open in Dark Blue wire between master switch assembly connector C2 terminal "A" and left front window motor connector terminal "A". Check for open in Brown wire between master switch assembly connector C2 terminal "E" and left front window motor connector terminal "B". See WIRING DIAGRAMS . Repair as necessary and retest system.

NEW STYLE TEST 2: LEFT FRONT WINDOW INOPERATIVE Disconnect master switch assembly connectors C1 and C2. Turn ignition switch to RUN position. Using a test light connected to ground, backprobe master switch assembly connector C2 terminal "F" (Dark Green wire). See Fig. 1 . If test light illuminates, go to step 3 . If test light does not illuminate, go to next step. Repair open in Dark Green wire between master switch assembly connector C2 terminal "F" and Left Bussed Electrical Center (LBEC) connector C4 terminal "K". See WIRING DIAGRAMS . Ensure left front window switch on master switch assembly is in neutral position. Connect a test light between battery voltage and master switch assembly connector C1 terminal "M" (Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 6 . Connect master switch assembly connectors C1 and C2. Disconnect left power window motor connector. Ensure ignition switch is in RUN position. Connect a test light between left power window motor connector terminals "A" (Dark Blue wire) and "B" (Brown wire). Observe test light while operating left front window switch on master switch assembly to UP and DOWN positions. If test light illuminates in both positions, go to next step. If test light does not illuminate in both positions, go to step 7 . Replace left power window motor. See WINDOW MOTOR & REGULATOR under REMOVAL & INSTALLATION. Repair open in Black wire between ground and master switch assembly connector C1 terminal "M". See WIRING DIAGRAMS and COMPONENT LOCATIONS . Using a test light, backprobe between master switch assembly connector C2 terminals "A" (Dark Blue wire) and "M" (Brown wire). Observe test light while operating left front window switch on master switch assembly to UP and DOWN positions. If test light illuminates in both positions, go to next step. If test light does not illuminate in both positions, go to step 9 . Check for open in Dark Blue wire between master switch assembly connector C2 terminal "A" and left front window motor connector terminal "A". Check for open in Brown wire between master switch assembly connector C2 terminal "M" and left front window motor connector terminal "B". See WIRING DIAGRAMS . Repair as necessary and retest system. Replace master switch assembly. See WINDOW SWITCH under REMOVAL & INSTALLATION. Fig. 1: Identifying Left Front Window Switch Connectors C1 & C2 & Right Front Window Switch Connector Terminals

hope this helps