This document provides information about diagnosing and servicing power window systems. It describes the major components, including the power window switch, motor, and circuit breaker. Diagnosis steps are outlined to troubleshoot issues like no windows operating or a single inoperative window. Service procedures are also included for removing and installing components like the window switch, motor, and regulator.

1. ZJ POWER WINDOWS 8S - 1
POWER WINDOWS
CONTENTS
page page
DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SERVICE PROCEDURES ................... 4
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1
GENERAL INFORMATION
Power door windows are standard equipment on anism. A positive and negative battery connection to
Grand 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 through
group covers diagnosis and service of the electrical these same two connections will cause the motor to
components peculiar to the power window system. rotate in the opposite direction. In addition, each
For 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 motor
23 - 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 entire
components 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 the
lowered electrically by operating the four two-way
switches on the driver’s door panel. A single two-way system from a short circuit, and can also protect the
switch 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 the
window 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. Measure
and down for the power window system to function resistance from ground lug on left side kick panel to
properly. If the window is not free to move up and ground. Meter should read zero ohms. If OK, go to
down, 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 left
regulator 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. Measure
moved 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 next
tight in the tracks. If window is free, proceed with di-
step. If not OK, repair circuit to circuit breaker 26 in
agnosis that follows. If window is not free, refer to
fuseblock module.
Group 23 - Body Components for service procedures.
(5) Close master window switch. Measure voltage
CIRCUIT 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. If
Pull 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 to
wire 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 INOPERATIVE
has battery voltage, circuit breaker is faulty and Remove door trim panel of inoperative window and
must 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. Measure
quired. 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 circuit
NO 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 PROCEDURES
POWER WINDOW SWITCH REMOVE/INSTALL
FRONT 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 front
of door.
(3) Remove screw and door handle cover.
(4) Remove screw from under armrest.
(5) Remove screw from bottom of hand hold cup in
armrest.
CAUTION: The wiring harness to the door switches
is just long enough to allow installation. If trim
panel is pulled off by hand the switch may be
Fig. 4 Rear Door Trim Panel Remove
pulled 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 at
tool (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 DOOR
armrest. (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 glass
panel 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 power
ing 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 sliding
2 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 Door
possible and push down. Tighten 2 window track
screws 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 as
ant, 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 to
REAR 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.