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Power Window System - New Style: Diagnosis GMC Yukon Denali

Windows 2 illustrations ~1429 words

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 Left Bussed Electrical Center (LBEC). See «COMPONENT LOCATIONS»(ref-2721-S22659477612000041200000) . If circuit breaker is open, locate and repair cause of overload. Replace if damaged.
  2. Check IGN B maxifuse (50-amp) located in Left Bussed Electrical Center (LBEC). If fuse is blown, locate and repair source of overload. Replace fuse.
  3. Check RAP maxifuse (50-amp) located in Underhood Bussed Electrical Center (UBEC). If fuse is blown, locate and repair source of overload. Replace fuse.
  4. Check for mechanical failures or binding linkage.
  5. If express down feature does not work, but window moves down with each switch depression, replace left window switch.
  6. 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.
  7. Check for proper installation of aftermarket electronic equipment. If problem still exists, repair by appropriate symptom. See «SYMPTOM INDEX»(ref-2721-S18522817472000041200000) table under SYMPTOM TESTS.

SYMPTOM TESTS

CAUTIONWhen battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

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 .

SymptomPerform Test
All Windows Inoperative1
Left Front Window Inoperative2
Right Window Inoperative3
Rear Window Inoperative4

SYMPTOM INDEX

TEST 1: ALL WINDOWS INOPERATIVE

  1. Connect scan tool to Data Link Connector (DLC). Check for current Body Control Module (BCM) Diagnostic Trouble Codes (DTCs). If any current BCM DTCs exist, perform appropriate test in accordance with DTC(s) retrieved. See appropriate BODY CONTROL MODULES article. If no current BCM DTCs exist, go to next step.
  2. Turn ignition switch to RUN position. Turn radio on. If radio operates, go to step 6 . If radio does not operate, go to next step.
  3. Disconnect Retained Accessory Power (RAP) relay. RAP relay is located in Left Bussed Electrical Center (LBEC). See «COMPONENT LOCATIONS»(ref-2721-S22659477612000041200000) . Connect a test light between ground and RAP relay connector terminal 87A (Red wire). See «WIRING DIAGRAMS»(ref-2721-S41960419892000041200000) . If test light illuminates, go to next step. If test light does not illuminate, go to step 5 .
  4. Replace RAP relay. Retest system operation.
  5. Repair open in Red wire between RAP relay connector terminal 87A and ignition switch. See «WIRING DIAGRAMS»(ref-2721-S41960419892000041200000) . Retest system operation.
  6. Disconnect Left Bussed Electrical Center (LBEC) connectors C1 and C4. See «COMPONENT LOCATIONS»(ref-2721-S22659477612000041200000) . Using a test light connected to ground, backprobe LBEC connector C1 terminal A9 (Dark Green wire) and LBEC connector C4 terminal "K" (Dark Green wire). If test light illuminates at both terminals, go to step 8 . If test light does not illuminate at both terminals, go to next step.
  7. Replace PWR WDO circuit breaker (25-amp) located in LBEC. Retest system operation.
  8. Check for open in Dark Green wire between LBEC connector C1 terminal A9 and right power window switch. Check for open in Dark Green wire between LBEC connector C4 terminal "K" and master switch assembly. See «WIRING DIAGRAMS»(ref-2721-S41960419892000041200000) . Repair as necessary and retest system.

TEST 2: LEFT FRONT WINDOW INOPERATIVE

  1. 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). (Scheme 1) If test light illuminates, go to step 3. If test light does not illuminate, go to next step.
  2. 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»(ref-2721-S41960419892000041200000).
  3. 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.
  4. 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.
  5. Replace left power window motor. See «WINDOW MOTOR & REGULATOR»(ref-2721-S24316789782000041200000) under REMOVAL & INSTALLATION.
  6. Repair open in Black wire between ground and master switch assembly connector C1 terminal "M". See «WIRING DIAGRAMS»(ref-2721-S41960419892000041200000) and «COMPONENT LOCATIONS»(ref-2721-S22659477612000041200000).
  7. 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.
  8. 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»(ref-2721-S41960419892000041200000). Repair as necessary and retest system.
  9. Replace master switch assembly. See «WINDOW SWITCH»(ref-2721-S08665816752000041200000) under REMOVAL & INSTALLATION.

Scheme 1

Scheme 1
Scheme 1

TEST 3: RIGHT FRONT WINDOW INOPERATIVE

  1. Turn ignition switch to RUN position. Using a test light connected to ground, backprobe right window switch connector terminal "M" (Dark Green wire). (Scheme 1) If test light illuminates, go to step 3. If test light does not illuminate, go to next step.
  2. Repair open in Dark Green wire between right window switch connector terminal "M" and Left Bussed Electrical Center (LBEC) connector C1 terminal A9. See «WIRING DIAGRAMS»(ref-2721-S41960419892000041200000). Repair as necessary and retest system.
  3. Disconnect right window motor connector. Connect a test light between right window motor connector terminals "A" (Dark Blue wire) and "B" (Brown wire). Observe test light while operating right window switch 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 connected to battery voltage, backprobe right window switch connector terminal "G" (Black wire). If test light illuminates, go to step 6. If test light does not illuminate, repair open in Black wire between ground and right window switch connector terminal "G". See «WIRING DIAGRAMS»(ref-2721-S41960419892000041200000).
  5. Check for open in Dark Blue wire between right window switch connector terminal "A" and right window motor connector terminal "A". Check for open in Brown wire between right window switch connector terminal "F" and right window motor connector terminal "B". See «WIRING DIAGRAMS»(ref-2721-S41960419892000041200000). Repair as necessary and retest system.
  6. Replace right window motor. See «WINDOW MOTOR & REGULATOR»(ref-2721-S24316789782000041200000) under REMOVAL & INSTALLATION.

TEST 4: REAR WINDOW INOPERATIVE

  1. Turn ignition switch to RUN position. Using a test light connected to ground, backprobe rear window switch connector terminal "A" (Dark Green wire). (Scheme 2) If test light illuminates, go to step 3. If test light does not illuminate, go to next step.
  2. Repair open in Dark Green wire between rear window switch connector terminal "A" and Left Bussed Electrical Center (LBEC) connector C1 terminal A9. See «WIRING DIAGRAMS»(ref-2721-S41960419892000041200000). Repair as necessary and retest system.
  3. Disconnect rear window motor connector. Connect a test light between rear window motor connector terminals "A" (Dark Blue wire) and "B" (Brown wire). Observe test light while operating rear window switch 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 connected to battery voltage, backprobe rear window switch connector terminal "C" (Black wire). If test light illuminates, go to step 6. If test light does not illuminate, repair open in Black wire between ground and rear window switch connector terminal "C". See «WIRING DIAGRAMS»(ref-2721-S41960419892000041200000).
  5. Check for open in Dark Blue wire between rear window switch connector terminal "A" and rear window motor connector terminal "A". Check for open in Brown wire between rear window switch connector terminal "B" and rear window motor connector terminal "B". See «WIRING DIAGRAMS»(ref-2721-S41960419892000041200000). Repair as necessary and retest system.
  6. Replace rear window motor. See «WINDOW MOTOR & REGULATOR»(ref-2721-S24316789782000041200000) under REMOVAL & INSTALLATION.

Scheme 2

Scheme 2
Scheme 2

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