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Power Window System Cadillac Escalade GMT400

Windows 2 illustrations ~2325 words

DESCRIPTION & OPERATION

A permanent-magnet motor operates each power window. Each motor raises and lowers window when voltage is supplied. Motor direction depends on polarity of supply voltage. Switches control supply voltage polarity.

Master switch assembly controls all motors. Individual window switches are located on each door panel. Each motor is protected by a built-in circuit breaker. If a window switch is held too long with window obstructed or after window is fully up or down, circuit breaker opens circuit. Circuit breaker resets automatically as it cools.

COMPONENT LOCATIONS

ComponentLocation
Instrument Panel Fuse BlockLeft Side Of Instrument Panel, Near Door Jamb Switch
Ground G202Right Side Of Instrument Panel, Mounted To HVAC Plenum Bracket

COMPONENT LOCATIONS

TROUBLE SHOOTING

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

SYSTEM CHECK

  1. Using master switch assembly, operate each window up and down.
  2. Using individual door switches, operate each window up and down. If all windows operate quietly and smoothly with no sticking, system check is complete. If any window does not function properly, perform «PRELIMINARY INSPECTION»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__preliminary-inspection) .

PRELIMINARY INSPECTION

  1. Check condition of POWER WINDOW circuit breaker, located in instrument panel fuse block. See «COMPONENT LOCATIONS»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__component-locations) . 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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) table under SYSTEM TESTS.

SYSTEM 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 Adaptor 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 Front, Right Rear Or Left Rear Window Inoperative (4-Door)3
Right Window Inoperative (2-Door)4

SYMPTOM INDEX

2-Door

  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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) and «COMPONENT LOCATIONS»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__component-locations) .
  2. Using a test light, backprobe between master switch assembly connector C1 terminals "L" (Yellow wire) and "C" (Black wire). 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 connection G202. See «WIRING DIAGRAMS»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) .
  3. Check master switch assembly connector for poor terminal contact. If connections are okay, replace master switch assembly. See «WINDOW SWITCH»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.

4-Door

  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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) .
  2. Using a test light, backprobe between master switch assembly connector C1 terminals "L" (Yellow wire) and "C" (Black wire). 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 connection G202. See «WIRING DIAGRAMS»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) .
  3. Check master switch assembly connector for poor terminal contact. If connection is okay, replace master switch assembly. See «WINDOW SWITCH»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.
  1. Turn ignition switch to RUN position. Using a test light, backprobe between master switch assembly connector terminals "A" (Dark Blue wire) and "E" (Brown wire). Move left 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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.
  2. Using a test light, backprobe between left window motor connector terminals "A" (Dark Blue wire) and "B" (Brown wire). Move left 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 window motor connector for poor terminal contact. If connections are okay, replace left window motor. See «WINDOW MOTOR & REGULATOR»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__window-motor-regulator) under REMOVAL & INSTALLATION.
  3. Repair open in Dark Blue wire or Brown wire between left power window motor and master switch assembly. See «WIRING DIAGRAMS»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) .
  1. Turn ignition switch to RUN position. Using a test light, backprobe between master switch assembly connector terminals "A" (Dark Blue wire) and "E" (Brown wire). 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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) 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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__window-motor-regulator) under REMOVAL & INSTALLATION.
  3. Check for open in Dark Blue wire between master switch assembly connector terminal "A" and left front window motor connector terminal "A". Check for open in Brown wire between master switch assembly connector terminal "E" and left front window motor connector terminal "B". See «WIRING DIAGRAMS»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) . 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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__window-motor-regulator) 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. 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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) . 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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.
  4. Using a test light, backprobe between master switch assembly 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). See «WIRING DIAGRAMS»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) . 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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.

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). 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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__system-check) under TROUBLESHOOTING.
  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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) . After repair, perform system check. See «SYSTEM CHECK»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__system-check) under TROUBLESHOOTING.
  8. Using a test light, backprobe between master switch assembly connector terminals "B" (Light Blue wire) and "D" (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 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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__system-check) under TROUBLESHOOTING.
  10. Check master switch assembly connector for poor terminal contact. Repair as necessary. If connection is okay, replace master switch assembly. See «WINDOW SWITCH»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) under REMOVAL & INSTALLATION. After repair, perform system check. See «SYSTEM CHECK»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__system-check) under TROUBLESHOOTING.
  11. Check right window motor for poor terminal contact. Repair as necessary. If connection is okay, replace right window motor. See «WINDOW MOTOR & REGULATOR»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__window-motor-regulator) under REMOVAL & INSTALLATION. After repair, perform system check. See «SYSTEM CHECK»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__system-check) under TROUBLESHOOTING.
  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»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system__system-check) under TROUBLESHOOTING.

REMOVAL & INSTALLATION

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.

WINDOW MOTOR & REGULATOR

Note. Power window motor is not serviceable. It is replaced as an assembly with window regulator.

Removal & Installation (Front)

  1. Disconnect negative battery cable. Insert a flat-blade screwdriver between door inside bezel and handle assembly. Carefully bend retaining clips outward while pulling on bezel. If vehicle is equipped with power door locks, disconnect electrical connector.
  2. Remove trim panel upper extension from trim panel by pulling upward. Remove armrest plugs from trim panel. Remove armrest screws and armrest pad. Disconnect courtesy light electrical connector (if equipped).
  3. Remove door trim panel by using Trim Pad Retainer Clip Remover (J-38778). Remove window switch. See «WINDOW SWITCH»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) . Disconnect electrical connectors. Remove water deflector by pulling it back from door assembly.
  4. Lower window completely. Remove bolts holding door inner panel to door. Disconnect lock and handle rods from back of door inner panel. Tape lock and handle rods to door. Disconnect remaining electrical connectors and push wiring into door. Move window run channel away from glass. Tilt door inner panel and window glass assembly, and lift door inner panel and glass out of bottom of door.
  5. Slide window glass channel from regulator roller assembly and remove window glass. Remove regulator assembly rivets. Remove regulator and motor as an assembly. To install, reverse removal procedure.

Removal & Installation (Rear)

  1. Lower window. Disconnect negative battery cable. Insert a flat-blade screwdriver between door inside bezel and handle assembly. Carefully bend retaining clips outward while pulling on bezel. If vehicle is equipped with power door locks, disconnect electrical connector.
  2. Remove speaker. Remove trim panel armrest screws. Remove door trim panel by using Trim Pad Retainer Clip Remover (J-38778). Remove window switch. See «WINDOW SWITCH»(/cadillac/escalade/gmt400-1998-2000/remont/windows/#power-window-system) . Disconnect electrical connectors. Set trim panel aside. Remove water deflector.
  3. Remove window sash channel bolts. Pull glass weatherstrip out of window frame and front window channel. Lift window out top of door. Drill out window regulator rivets and slide window regulator out lower rear access hole in door. To install, reverse removal procedure.

Disconnect negative battery cable. Using flat-blade screwdriver, pry window switch panel from door trim panel. Disconnect electrical connector and remove window switch panel. To install, reverse removal procedure.

Fig. 1: Power Window System Wiring Diagram ("C" & "K" Series Pickup, Tahoe & Yukon - 2-Door)
Scheme 1: Power Window System Wiring Diagram ("C" & "K" Series Pickup, Tahoe & Yukon - 2-Door)
Fig. 2: Power Window System Wiring Diagram ("C" & "K" Series Pickup, Suburban, Tahoe & Yukon - 4-Door)
Scheme 2: Power Window System Wiring Diagram ("C" & "K" Series Pickup, Suburban, Tahoe & Yukon - 4-Door)