Power Window System - Old Style: Diagnosis GMC Yukon Denali

TROUBLE SHOOTING

Note. To prevent misdiagnosis, ensure no Diagnostic Trouble Codes (DTCs) exist. See appropriate BODY CONTROL MODULES article.

PRELIMINARY INSPECTION

1. Check condition of POWER WINDOW circuit breaker located in instrument panel fuse block. See «COMPONENT LOCATIONS»(ref-3327-S08208793792000042500000) . If circuit breaker is open, locate and repair cause of overload. Replace if damaged.
2. Check for mechanical failures or binding linkage.
3. If express down feature does not work but window moves down with each switch depression, replace left window switch.
4. Check for broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. These circuits may be intermittent or resistive when loaded. Check by monitoring voltage drop with system under load.
5. Check for proper installation of aftermarket electronic equipment. Correct any obvious problems before continuing testing. If problem still exists, identify window symptom and perform appropriate system test. See «SYMPTOM INDEX»(ref-3327-S10078401122000042500000) table under SYMPTOM TESTS.

SYMPTOM TESTS

Note. Before any testing is attempted, battery should be fully charged and all connections and pins cleaned and tightened to ensure proper continuity and ground.

Note. To prevent damage to terminals, Connector Test Adapter Kit (J-35616-A) must be used whenever a diagnostic procedure requires checking or probing a terminal. To locate and identify terminals, see WIRING DIAGRAMS .

SYMPTOM INDEX

TEST 1: ALL WINDOWS INOPERATIVE

1. Turn ignition switch to RUN position. Using a test light connected to ground, backprobe master switch assembly connector C1 terminal "L" (Yellow wire). If test light illuminates, go to next step. If test light does not illuminate, repair open in Yellow wire between master switch assembly and instrument panel fuse block. See «WIRING DIAGRAMS»(ref-3327-S12188665612000042500000) and «COMPONENT LOCATIONS»(ref-3327-S08208793792000042500000).
2. Using a test light, backprobe between master switch assembly connector C1 terminal "L" (Yellow wire) and connector C2 terminal "C" (Black wire). (Scheme 5)and (Scheme 6). If test light illuminates, go to next step. If test light does not illuminate, repair open in Black wire between master switch assembly and ground. See «WIRING DIAGRAMS»(ref-3327-S12188665612000042500000).
3. Check master switch assembly connectors for poor terminal contact. If connections are okay, replace master switch assembly. See «WINDOW SWITCH»(ref-3327-S07676453832000042500000) under REMOVAL & INSTALLATION.

Scheme 5

Scheme 6

TEST 2: LEFT FRONT WINDOW INOPERATIVE

1. 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). (Scheme 6) 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»(ref-3327-S07676453832000042500000) under REMOVAL & INSTALLATION.
2. 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»(ref-3327-S18517033052000042500000) under REMOVAL & INSTALLATION.
3. 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»(ref-3327-S12188665612000042500000). Repair as necessary and retest system.

TEST 3: RIGHT FRONT, RIGHT REAR OR LEFT REAR WINDOW INOPERATIVE (4-DOOR)

1. Turn ignition switch to RUN position. Disconnect inoperative window motor connector. Connect a test light between inoperative window motor connector terminals "A" (Dark Blue wire) and "B" (Brown wire). Move window switch of inoperative window to UP and DOWN positions. If test light illuminates in both positions, check inoperative window motor for poor terminal contact. If connections are okay, replace power window motor. See «WINDOW MOTOR & REGULATOR»(ref-3327-S18517033052000042500000) under REMOVAL & INSTALLATION. If test light does not illuminate in both positions, go to next step.
2. Using a test light, backprobe between inoperative window switch connector terminals "A" (Purple wire) and "D" (Brown wire) on rear window, or terminals "J" (Light Blue wire) and "L" (Tan wire) on right front window. (Scheme 5)and (Scheme 7). Press inoperative 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 4.
3. Connect a test light between inoperative window switch connector terminals "G" (Dark Blue wire) and "K" (Brown wire) on right front, or terminals "H" (Dark Blue wire) and "D" (Brown wire) on left or right rear. Move window switch at inoperative door to UP and DOWN positions. If test light illuminates in both positions, repair open in Dark Blue wire or Brown wire between inoperative window switch and inoperative window regulator motor. See «WIRING DIAGRAMS»(ref-3327-S12188665612000042500000). If test light does not illuminate in both positions, check inoperative window switch for poor terminal contact. If connections are okay, replace inoperative window switch. See «WINDOW SWITCH»(ref-3327-S07676453832000042500000) under REMOVAL & INSTALLATION.
4. Using a test light, backprobe between master switch assembly connector C2 terminals "B" (Light Blue wire) and "D" (Tan wire) for right front window. For left rear window, connect a test light between master switch assembly connector C2 terminal "G" (Dark Green wire) and master switch assembly connector C1 terminal "K" (Purple wire). For right rear window, connect a test light between master switch assembly connector C2 terminal "H" (Light Green wire) and master switch assembly connector C1 terminal "H" (Purple wire). (Scheme 5)and (Scheme 6). See «WIRING DIAGRAMS»(ref-3327-S12188665612000042500000). Press inoperative window switch on master switch assembly to UP and DOWN positions. If test light illuminates in both positions, repair loose connectors or open in wire between master switch assembly connector(s) and inoperative window switch. If test light does not illuminate in both positions, replace master switch assembly. See «WINDOW SWITCH»(ref-3327-S07676453832000042500000) under REMOVAL & INSTALLATION.

Scheme 7

TEST 4: RIGHT WINDOW INOPERATIVE (2-DOOR)

1. Turn ignition switch to RUN position. Using a test light connected to ground, backprobe right window switch connector terminal "F" (Yellow wire). (Scheme 5) If test light illuminates, go to next step. If test light does not illuminate, go to step 7.
2. Using a test light, backprobe between right window switch connector terminals "J" (Light Blue wire) and "L" (Tan wire). Move right 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 8.
3. Using a test light, backprobe between right window switch connector terminals "G" (Dark Blue wire) and "K" (Brown wire). Move right 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 5.
4. Using a test light, backprobe between right window switch connector terminals "G" (Dark Blue wire) and "K" (Brown wire). Move right window switch to UP and DOWN positions. If test light illuminates in both positions, go to step 6. If test light does not illuminate in both positions, go to next step.
5. Replace right window switch. After repair, perform system check. See «SYSTEM CHECK»(ref-3327-S35815686582000042500000) under TROUBLE SHOOTING.
6. Using a test light, backprobe between right window motor connector terminals "A" (Dark Blue wire) and "B" (Brown wire). Move right window switch to UP and DOWN positions. If test light illuminates in both positions, go to step 11. If test light does not illuminate in both positions, go to step 12.
7. Repair open in Yellow wire between right window switch and instrument panel fuse block. See «WIRING DIAGRAMS»(ref-3327-S12188665612000042500000). After repair, perform system check. See «SYSTEM CHECK»(ref-3327-S35815686582000042500000) under TROUBLE SHOOTING.
8. Using a test light, backprobe between master switch assembly connector C2 terminals "B" (Light Blue wire) and "D" (Tan wire). (Scheme 6) Move right 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 10.
9. Repair open in Light Blue or Tan wire between master switch assembly and right window switch. After repair, perform system check. See «SYSTEM CHECK»(ref-3327-S35815686582000042500000) under TROUBLE SHOOTING.
10. Check master switch assembly connector for poor terminal contact. Repair as necessary. If connection is okay, replace master switch assembly. See «WINDOW SWITCH»(ref-3327-S07676453832000042500000) under REMOVAL & INSTALLATION. After repair, perform system check. See «SYSTEM CHECK»(ref-3327-S35815686582000042500000) under TROUBLE SHOOTING.
11. Check right window motor for poor terminal contact. Repair as necessary. If connection is okay, replace right window motor. See «WINDOW MOTOR & REGULATOR»(ref-3327-S18517033052000042500000) under REMOVAL & INSTALLATION. After repair, perform system check. See «SYSTEM CHECK»(ref-3327-S35815686582000042500000) under TROUBLE SHOOTING.
12. Repair open in Dark Blue or Brown wire between right window switch and right window motor. After repair, perform system check. See «SYSTEM CHECK»(ref-3327-S35815686582000042500000) under TROUBLE SHOOTING.