Power Window System GMC Savana I

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 window 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

COMPONENT LOCATIONS

PRELIMINARY INSPECTION

1. On Astro and Safari, check condition of WINDOWS circuit breaker (30-amp for 1999-2000; 25-amp for 2001) located in instrument panel fuse block. If circuit breaker is open, locate and repair cause of overload. Replace if damaged.
2. On Chevy Express and Savana, check PWR WDO (25-amp) fuse located in instrument panel fuse block. If fuse is blown, locate and repair source of overload. Replace fuse.
3. On all models, check for mechanical failures or binding linkage. If express down feature does not work but window moves down with each switch depression, replace master window switch assembly.
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.
5. Check by monitoring voltage drop with system under load. Check for proper installation of aftermarket electronic equipment. If problem still exists, identify symptom and perform appropriate test. See «SYMPTOM INDEX»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) table under SYSTEM TESTS.

SYSTEM CHECK

Turn ignition switch to ACC position. Operate each window up and down from master window switch assembly. Operate each window from individual switch. If all windows operate quietly and smoothly without sticking, system check is complete. If all windows do not function properly, perform PRELIMINARY INSPECTION .

SYSTEM 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 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 .

SYMPTOM INDEX

Astro & Safari

1. Disconnect master window switch assembly connector. Turn ignition switch to RUN position. Connect a test light between ground and master window switch assembly connector C1 terminal "L" (Yellow wire). (Scheme 1) If test light illuminates, go to next step. If test light does not illuminate, repair open in Yellow wire between master window switch assembly connector and instrument panel fuse block. See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
2. Connect a test light between master window switch assembly connector C1 terminal "L" (Yellow wire) and master window switch assembly connector C2 terminal "C" (Black wire). (Scheme 2) If test light illuminates, replace master window switch assembly. If test light does not illuminate, repair open in Black wire between master window switch assembly connector C2 terminal "C" and ground. See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system). Retest system.

Scheme 1

Scheme 2

Chevy Express & Savana

1. Check PWR WDO (25-amp) fuse in instrument panel fuse block. See «COMPONENT LOCATIONS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system__component-locations). If fuse is blown, go to step 4. If fuse is not blown, go to next step.
2. Disconnect master window switch assembly connector. Connect an ohmmeter between ground and master window switch assembly connector terminal "G" (Black wire). (Scheme 3) If continuity exists, go to next step. If continuity does not exist, go to step 5.
3. Turn ignition switch to ACC position. Connect a test light between ground and master window switch assembly connector terminal "H" (Yellow wire). (Scheme 3) If test light does not illuminate, go to step 7. If test light illuminates, go to step 6.
4. Repair short in Yellow wire between PWR WDO fuse terminal in instrument panel fuse block and either window switch connector. See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
5. Repair open in Black wire between master window switch assembly connector terminal "G" and ground. See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
6. Replace master window switch assembly. See «WINDOW SWITCH»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.
7. Repair open in Yellow wire between PWR WDO fuse terminal in instrument panel fuse block and master window switch. See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).

Identifying Power Window Switch Connector Terminals (Chevy Express & Savana). Scheme 3

1. Disconnect left window motor connector. Turn ignition switch to RUN position. Connect a test light between ground and left window motor connector terminal "A" (Dark Blue wire). Press left window switch on master window switch assembly to UP position. If test light illuminates, go to next step. If test light does not illuminate, go to step 3.
2. Connect a test light between left window motor connector terminals "A" (Dark Blue wire) and "B" (Brown wire). Press left window switch on master window switch assembly to UP position. If test light illuminates, go to step 4. If test light does not illuminate, go to step 5.
3. Check for an open in Dark Blue wire between left window motor connector terminal "A" and master window switch assembly connector C2 terminal "A". (Scheme 2) See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system). If Dark Blue wire is open, go to step 7. If Dark Blue wire is okay, go to step 6.
4. Replace left window motor. See «WINDOW MOTOR»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) under REMOVAL & INSTALLATION. Retest system.
5. Check for an open in Brown wire between left window motor connector terminal "B" and master window switch assembly connector C2 terminal "E". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system). If Brown wire is open, go to step 8. If Brown wire is okay, go to next step.
6. Replace master window switch assembly. See «WINDOW SWITCH»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) under REMOVAL & INSTALLATION. Retest system.
7. Repair open in Dark Blue wire between left window motor connector terminal "A" and master window switch assembly connector C2 terminal "A".
8. Repair open in Brown wire between left window motor connector terminal "B" and master window switch assembly connector C2 terminal "E".

1. Disconnect master window switch assembly connector. Disconnect left window motor connector. Connect an ohmmeter between master window switch assembly terminal "E" and left window motor connector terminal "A" (Dark Blue wire). (Scheme 3) If continuity exists, go to next step. If continuity does not exist, go to step 8.
2. Connect an ohmmeter between master window switch assembly connector terminal "A" and left window motor connector terminal "B" (Brown wire). If continuity exists, go to next step. If continuity does not exist, go to step 9.
3. Connect an ohmmeter between master window switch assembly terminals "E" and "G" (component side). If continuity exists, go to next step. If continuity does not exist, go to step 10.
4. Connect an ohmmeter between master window switch assembly terminals "A" and "G" (component side). If continuity exists, go to next step. If continuity does not exist, go to step 10.
5. Connect a test light between ground and master window switch assembly connector terminal "H" (Yellow wire). (Scheme 3) Turn ignition switch to ACC position. If test light illuminates, go to next step. If test light does not illuminate, go to step 11.
6. Connect master window switch assembly connector. Connect a test light between ground and left window motor connector terminal "A" (Dark Blue wire). Press left window switch on master window switch assembly to UP position. If test light illuminates, go to next step. If test light does not illuminate, go to step 10.
7. Connect a test light between ground and left window motor connector terminal "B" (Brown wire). Press left window switch on master window switch assembly to DOWN position. If test light illuminates go to step 12. If test light does not illuminate, go to step 10.
8. Repair open in Dark Blue wire between master window switch assembly connector terminal "E" and left window motor connector "A". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
9. Repair open in Brown wire between master window switch assembly connector terminal "A" and left window motor connector terminal "B". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
10. Replace master window switch assembly. See «WINDOW SWITCH»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.
11. Repair open in Yellow wire between master window switch assembly connector terminal "H" and splice S229. See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
12. If no mechanical problems or binding exists in operation of window regulator, replace left window motor. See «WINDOW MOTOR»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.

Disconnect right window switch connector. Turn ignition switch to RUN position. Connect a test light between ground and right window switch connector C2 terminal "F" (Yellow wire). (Scheme 1) If test light illuminates, replace right window switch. See WINDOW SWITCH under REMOVAL & INSTALLATION. If test light does not illuminate, repair open in Yellow wire between right window switch connector C2 terminal "F" and splice S305. See WIRING DIAGRAMS.

Disconnect right window switch connector. Turn ignition switch to ACC position. Connect a test light between ground and right window switch connector terminal "F" (Yellow wire). (Scheme 3) If test light illuminates, replace right window switch. See WINDOW SWITCH under REMOVAL & INSTALLATION. If test light does not illuminate, repair open in Yellow wire between right window switch and splice S229. See WIRING DIAGRAMS.

1. Using test light, backprobe between right window switch connector C2 terminals "G" (Dark Blue wire) and "K" (Brown wire). (Scheme 1) Observe test light while pressing right window switch in UP or DOWN position. If test light illuminates in both positions, go to next step. If test light does not illuminate in both positions, go to step 4.
2. Disconnect right window motor connector. Connect a test light between right window motor connector terminals "A" (Brown wire) and "B" (Dark Blue wire). Observe test light while pressing right window switch in UP or DOWN position. If test light does not illuminate in both positions, go to next step. If test light illuminates in both positions, go to step 5.
3. Connect an ohmmeter between ground and right window motor connector terminal "A" (Brown wire). If continuity exists, go to step 6. If continuity does not exist, go to step 7.
4. Disconnect right window switch connector. Connect an ohmmeter between ground and right window switch connector C2 terminal "J" (Light Blue wire). (Scheme 1) If continuity exists, go to step 8. If continuity does not exist, go to step 11.
5. Replace right window motor. See «WINDOW MOTOR»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.
6. Repair open in Dark Blue wire between right window switch connector C2 terminal "G" and right window motor connector terminal "B". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
7. Repair open in Brown wire between right window switch connector C2 terminal "K" and right window motor connector terminal "A". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
8. Connect an ohmmeter between ground and right window switch connector C2 terminal "L" (Tan wire). If continuity exists, go to step 10. If continuity does not exist, go to next step.
9. Connect an ohmmeter between ground and master window switch assembly connector C2 terminal "D" (Tan wire). (Scheme 2) If continuity exists, go to step 12. If continuity does not exist, go to step 13.
10. Replace right window switch. See «WINDOW SWITCH»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.
11. Connect an ohmmeter between ground and master window switch assembly connector C2 terminal "B" (Light Blue wire). (Scheme 2) If continuity exists, go to step 14. If continuity does not exist, go to step 15.
12. Repair open in Tan wire between right window switch connector C2 terminal "L" and master window switch assembly connector C2 terminal "D". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
13. Replace master window switch assembly. See «WINDOW SWITCH»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.
14. Repair open in Light Blue wire between right window switch connector C2 terminal "J" and master window switch assembly connector C2 terminal "B". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
15. Replace master window switch assembly. See «WINDOW SWITCH»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.

1. Disconnect master window switch assembly and right window switch connectors. Connect an ohmmeter between master window switch assembly connector terminal "F" and right window switch connector terminal "D" (Light Blue wire). (Scheme 3) If continuity exists, go to next step. If continuity does not exist, go to step 5.
2. Connect an ohmmeter between master window switch assembly connector terminal "B" and right window switch connector terminal "H" (Tan wire). (Scheme 3) If continuity exists, go to next step. If continuity does not exist, go to step 6.
3. Disconnect right window motor connector. Connect an ohmmeter between right window switch connector terminal "A" and right window motor connector terminal "B" (Brown wire). (Scheme 3) If continuity exists, go to next step. If continuity does not exist, go to step 7.
4. Connect an ohmmeter between right window switch connector terminal "E" and right window motor connector terminal "A" (Dark Blue wire). (Scheme 3) If continuity exists, go to step 8. If continuity does not exist, go to step 9.
5. Repair open in Light Blue wire between master window switch assembly connector terminal "F" and right window switch connector terminal "D". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
6. Repair open in Tan wire between master window switch assembly connector terminal "B" and right window switch connector terminal "H". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
7. Repair open in Brown wire between right window switch connector terminal "A" and right window motor connector terminal "B". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).
8. If no mechanical problems or binding exists in operation of window regulator, replace right window motor. See «WINDOW MOTOR»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) under REMOVAL & INSTALLATION.
9. Repair open in Dark Blue wire between right window switch connector terminal "E" and right window motor connector terminal "A". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system).

REMOVAL & INSTALLATION

Removal & Installation (Astro & Safari)

1. Raise window to full up position. Disconnect negative battery cable. Remove 2 armrest cover screws and remove armrest cover. Remove lock lever escutcheon by pulling out and away from trim panel, starting at front. Remove upper corner trim from door by pulling out on top edge and pivoting down to clear tab at trim panel.
2. Remove assist handle retaining screw covers. Remove assist handle retaining screws. Remove door switch mounting plate. See «WINDOW SWITCH»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) . Gently push courtesy light lens toward front of vehicle. Using flat-blade tool, pry rear of courtesy light lens away from trim panel and front retaining tab on lens. Remove courtesy light assembly from door.
3. Using Trim Pad And Garnish Clip Remover (J-38778), pry trim panel from door near retaining clips. Remove trim panel from door and set aside. Remove inner panel upper bar from door. Remove water deflector.
4. Apply cloth-backed body tape from window over top of door to other side of window to hold glass in position when regulator is removed. Disconnect wiring harness from regulator motor. Using 1/4" (6 mm) drill bit, remove regulator-to-door rivets.
5. Push regulator into door, and slide in and forward. Then push rearward to remove regulator arms from sash and regulator rail. Fold regulator arms together and remove regulator through access hold.
6. Install a self-tapping, pan head sheet metal screw through sector gear and backing plate at hole provided to lock sector gear into position. Drill out motor-to-regulator attaching rivets. Remove motor from regulator. To install, reverse removal procedure. Lubricate motor drive gear and regulator sector teeth. Check mesh of motor-to-regulator before installing NEW 1/4" (6 mm) rivets.

Removal & Installation (Chevy Express & Savana)

1. Disconnect negative battery cable. Pull upper door garnish molding at top edge to release retaining clips. Lift up on garnish molding to disengage lower tab at trim panel. Remove door trim plate and window switch. See «WINDOW SWITCH»(/gmc/savana/i-1996-2002/remont/windows/#power-window-system) . Remove armrest screws. Remove door trim outer panel screws and door trim outer panel (if equipped) by pulling retainers away from door. Remove door trim inner panel screws and inner panel.
2. Remove protective water shield by pulling it back from door assembly. Disconnect electrical connector from window motor. Remove nuts securing window motor to door module, and remove window motor from module. To install, reverse removal procedure. Lubricate motor drive dear and regulator sector teeth. Tighten all nuts and bolts to 97 INCH lbs. (11 N.m).

Disconnect negative battery cable. Remove 2 armrest cover screws and remove armrest cover. Remove lock lever trim. Remove upper corner trim by pulling out on top edge and pivoting down to clear tab at trim panel. Remove 2 assist handle retaining screw covers. Remove 2 assist handle retaining screws and assist handle from door. Remove screw from front edge of accessory switch mounting plate. Remove mounting plate from trim panel. Disconnect electrical connectors. Remove window switch. To install, reverse removal procedure.

Disconnect negative battery cable. Release retaining tab on inside door handle bezel and remove inside door handle bezel from door trim plate. Remove door trim plate screws. Pull out on bottom of door trim plate and remove door trim plate from trim panel. Disconnect electrical connectors. Press in spring clip and remove escutcheon from door trim plate. Remove power window switch from escutcheon by releasing tabs on switch. To install, reverse removal procedure.

See also:
• SYMPTOM INDEX
• PRELIMINARY INSPECTION
• COMPONENT LOCATIONS