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  • 1. ZJ POWER WINDOWS 8S - 1 POWER WINDOWS CONTENTS page pageDIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SERVICE PROCEDURES ................... 4GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1 GENERAL INFORMATION Power door windows are standard equipment on anism. A positive and negative battery connection toGrand Cherokee models. The power windows operate the two motor terminals will cause the motor to ro-only with the ignition switch in the ON position. This tate in one direction. Reversing current throughgroup covers diagnosis and service of the electrical these same two connections will cause the motor tocomponents peculiar to the power window system. rotate in the opposite direction. In addition, eachFor service of mechanical components such as the power window motor is equipped with an integral au-regulator, lift plate or window tracks refer to Group tomatic re-setting circuit breaker to protect the motor23 - Body Components. from overloads. The power window motor and gear- Following are general descriptions of the major box assembly cannot be repaired. If faulty, the entirecomponents in the power window system. Refer to assembly must be replaced.Group 8W - Wiring Diagrams for complete circuit de-scriptions and diagrams. CIRCUIT BREAKER An automatic re-setting circuit breaker in the fuse-POWER WINDOW SWITCH block module is used to protect the power window Both front and rear door windows can be raised or system circuit. The circuit breaker can protect thelowered electrically by operating the four two-wayswitches on the driver’s door panel. A single two-way system from a short circuit, and can also protect theswitch on each passenger’s door panel operates only system from an overload condition caused by an ob-the window on that passenger’s door. The switches structed or stuck window glass or regulator. The cir-cannot be repaired. If faulty, they must be replaced. cuit breaker can not be repaired. If faulty, it must be replaced.POWER WINDOW MOTOR A permanent magnet reversible motor moves thewindow regulator through an integral gearbox mech-
  • 2. 8S - 2 POWER WINDOWS ZJ DIAGNOSIS It is necessary that the window be free to slide up (2) Turn ignition switch to OFF position. Measureand down for the power window system to function resistance from ground lug on left side kick panel toproperly. If the window is not free to move up and ground. Meter should read zero ohms. If OK, go todown, the motor will overload and trip the circuit next step. If not OK, repair circuit to ground.breaker. To determine if the glass is free, disconnect (3) Remove master power window switch on leftregulator plate from the glass and slide window up front door (see Service Procedures). Measure resis-and down by hand. tance at black wire (terminal 1 of green connector). An alternate method is to shake the glass in the Meter should read zero ohms. If OK, go to next step.door, with the glass positioned between the up and If not OK, repair circuit to ground.down stop positions. Check that the glass can be (4) Turn ignition switch to ON position. Measuremoved slightly from side to side, front to rear, and up voltage at tan wire (terminal 5 of black connector).and down. Then check that window is not bound Meter should read battery voltage. If OK, go to nexttight in the tracks. If window is free, proceed with di- step. If not OK, repair circuit to circuit breaker 26 inagnosis that follows. If window is not free, refer to fuseblock module.Group 23 - Body Components for service procedures. (5) Close master window switch. Measure voltageCIRCUIT BREAKER at yellow wire (terminal 1 of black connector). Meter Locate correct circuit breaker in fuseblock module. should read battery voltage. If OK, go to next step. IfPull out slightly, but be sure that circuit breaker ter- not OK, replace switch.minals still contact terminals in fuseblock module. (6) Operate window switch. All windows should op-Turn ignition switch to ON position. Connect ground erate. If there are still inoperative windows go towire of voltmeter to a good ground. With probe of One Window Inoperative.voltmeter positive lead, check both terminals of cir-cuit breaker for battery voltage. If only one terminal ONE WINDOW INOPERATIVEhas battery voltage, circuit breaker is faulty and Remove door trim panel of inoperative window andmust be replaced. If neither terminal has battery probe harness side of switch connector.voltage, repair circuit from ignition switch as re- (1) Turn ignition switch to ON position. Measurequired. voltage at terminal 2 of connector while holding cor- responding master switch in the DOWN position.POWER WINDOW SYSTEM Meter should read battery voltage. If OK, go to next Before you proceed with this diagnosis, confirm step. If not OK, repair circuit to master switch.proper circuit breaker operation. See Circuit Breaker (2) With master switch still in DOWN position,diagnosis. measure voltage at terminal 6 of connector. Meter should read battery voltage. If OK, repair circuitNO WINDOWS OPERATE back to master switch. If not OK, go to next step. (1) Turn ignition switch to ON position. Measure (3) With master switch still in DOWN position,voltage at 30 amp circuit breaker 26 at fuseblock check for battery voltage at motor terminals. If OK,module. Meter should read battery voltage. If OK, go replace motor/gearbox assembly or regulator as re-to next step. If not OK, replace circuit breaker or re- quired. If not OK, repair circuit back to switch.pair open to ignition switch or fuse 13 in PDC as re-quired.
  • 3. ZJ POWER WINDOWS 8S - 3 Fig. 1 Power Window System Schematic
  • 4. 8S - 4 POWER WINDOWS ZJ SERVICE PROCEDURESPOWER WINDOW SWITCH REMOVE/INSTALLFRONT DOOR (1) Remove screw at top of trim panel near mirror(Fig. 2). Fig. 3 Trim Panel Remove - Typical Fig. 2 Front Door Trim Panel Remove (2) Remove screw from demister opening at frontof door. (3) Remove screw and door handle cover. (4) Remove screw from under armrest. (5) Remove screw from bottom of hand hold cup inarmrest.CAUTION: The wiring harness to the door switchesis just long enough to allow installation. If trimpanel is pulled off by hand the switch may be Fig. 4 Rear Door Trim Panel Removepulled apart. Use a door clip tool to prevent damag-ing the switches. (4) Remove the trim panel with a wide, flat-bladed tool (Fig. 3). (6) Remove the trim panel with a wide, flat-bladed To aid in removal of the trim panel, start attool (Fig. 3). the bottom of the panel. To aid in removal of the trim panel, start at (5) Unplug electrical connector from switch.the bottom of the panel. (6) Remove switch from door panel. (7) Unplug electrical connector from switch. (7) Reverse removal procedures to install. (8) Remove switch from door panel. (9) Reverse removal procedures to install. POWER WINDOW MOTOR REMOVE/INSTALL To service power window motor or regulator, re-REAR DOOR move door trim panel as described in Power Window (1) Remove screw and door handle cover (Fig. 4). Switch Remove/Install then proceed as follows. (2) Remove screw from under armrest. (3) Remove screw from bottom of hand hold in FRONT DOORarmrest. (1) Loosen 2 nuts holding glass to window regula- tor (Fig. 5).CAUTION: The wiring harness to the door switches (2) Slide glass rearward to remove from nuts.is just long enough to allow installation. If trim (3) Pull glass to the full up position and tape glasspanel is pulled off by hand the switch may be to the door.pulled apart. Use a door clip tool to prevent damag- (4) Unplug wire harness connector from powering the switches. window regulator.
  • 5. ZJ POWER WINDOWS 8S - 5 Fig. 5 Remove/Install Glass Attaching Nuts (5) Remove 4 window regulator screws (Fig. 6). Fig. 7 Remove Glass Attaching Screw - Rear Door (6) Pull glass to full up position and tape glass to door. (7) Unplug wire harness connector from power window regulator. (8) Remove 4 window regulator screws (Fig. 8). Fig. 6 Window Regulator Remove - Front Door (6) Loosen last 2 window track screws (Fig. 6). (7) Remove window regulator. (8) To install, place regulator inside door by sliding2 loose screws in slots in door. (9) Install remaining screws and tighten to 12 N⅐m(105 in. lbs.). (10) Move glass as far rearward into channel as Fig. 8 Window Regulator Remove - Rear Doorpossible and push down. Tighten 2 window trackscrews to 12 N⅐m (105 in. lbs.). (9) Loosen 2 remaining window track screws (Fig. 8). (11) Attach door glass by sliding 2 nuts into the (10) Remove window regulator. (11) To install, place regulator inside door by slid-slots on the regulator (Fig. 5). Tighten door glass ing 2 loose screws in slots in door.nuts to 12 N⅐m (105 in. lbs.). (12) Install remaining screws and tighten to 12 (12) Connect wire harness connector to regulator. N⅐m (105 in. lbs.). (13) Using 3M 08044 or 3M 08041 adhesive/seal- (13) Move glass as far rearward into channel asant, install plastic water shield. possible and push down. Tighten 2 window track (14) Reverse remaining removal procedures to com- screws to 12 N⅐m (105 in. lbs.).plete installation. (14) Attach door glass by sliding the 2 nuts into slots on regulator (Fig. 7). Tighten door glass nuts toREAR DOOR 12 N⅐m (105 in. lbs.). (1) Lower window until 2 nuts holding the glass to (15) Connect wire harness connector to regulator.the regulator are visible (Fig. 7). (16) Install speaker. (2) Remove screws holding speaker. (17) Using 3M 08044 or 3M 08041 adhesive/seal- (3) Pull speaker from door and unplug connector. ant, install plastic water shield. (4) Loosen 2 nuts holding glass to window regula- (18) Reverse remaining removal procedures to com-tor (Fig. 7). plete installation. (5) Slide glass forward to remove from nuts.