JEEP CHEROKEE 1994 Service Repair Manual

POWER WINDOWS
CONTENTS
page page
DESCRIPTION........................... 1
DIAGNOSIS (Figs. 1 and 2)............... 1SWITCH TESTING....................... 5
WINDOW REGULATOR REPLACEMENT...... 9
DESCRIPTION
All XJ vehicles, equipped with power windows,
have a cable driven window regulator system. A per-
manent magnet motor moves each power window.
Each motor raises or lowers the glass when voltage
is supplied to the motor. The direction the motor
turns depends on the polarity of the supply voltage.
The control switches control the supply voltage polar-
ity.
With the ignition switch in the ON position voltage
from the 60 amp fuse in the Power Distribution Cen-
ter is applied through the power window circuit
breaker. Power then goes to the master switch termi-
nal BY and to the passenger's window switches.
When the driver's window switch is moved UP, the
contacts close a current path to:
²terminal DV
²driver's side front window motor
²terminal CV
²the DOWN contact of the driver's side front win-
dow to ground.
The motor then moves the glass up.
Current flows in a similar way when the UP con-
tact in one of the passenger's window switches is
closed. Current flow through the passenger's window
motors must go through the driver's and the passen-
ger's window switches before it reaches ground.
Each motor is protected by a built-in circuit
breaker. If a window switch is held on too long with
the window obstructed or after the window is fully
up or down, the circuit breaker opens the circuit. The
circuit breaker resets automatically as it cools. Do
not allow frequent or consecutive resetting of the cir-
cuit breaker to continue.
DIAGNOSIS (Figs. 1 and 2)
For information concerning wiring or connectors,
refer to Group 8W - Wiring Diagrams.
NO WINDOWS OPERATE
²Measure voltage at power window feed connector
at fuse panel. Meter should read battery voltage. If
not, replace 60 amp fuse in Power Distribution Cen-
ter.
²Turn ignition switch to OFF and measure resis-
tance from side of cigar lighter socket to ground.
Meter should read zero ohms. If not, repair open to
ground.
²Remove master door lock/power window switch as-
sembly mounting screws. Measure resistance at BLK
wire (terminal DX) at driver's side switch. Meter
should read zero ohms. If not, repair open to ground
splice of instrument panel harness.
²Turn ignition switch to ON and measure voltage
at terminal BY at driver's side switch. Meter should
read battery voltage. If not, repair open to circuit
breaker.
²Operate window switch. If the windows move up
and down go to Switch Testing.
²Perform Switch Test Driver's Door. If switch
passes test, replace defective motors.
ONE WINDOW OPERATES
Remove door panel of inoperative window,
probe harness side of unplugged motor connec-
tor.
²Measure voltage at terminal A of connector, hold-
ing switch in the DOWN position. Meter should read
battery voltage. If not, repair open back to master
switch. If additional switch is in circuit (not driver's
side motor), refer to Switch Testing.
²Measure resistance at terminal B of connector,
holding switch in the DOWN position. Meter should
read zero ohms. Caution, maintain DOWN position
while meter lead is attached. If not, repair open back
to master switch. If additional switch is in circuit
(not driver's side motor), refer to Switch Testing. If
both tests are OK, replace regulator.
JPOWER WINDOWS 8S - 1

Fig. 1 Power Windows 4-DoorÐXJ
8S - 2 POWER WINDOWSJ

Fig. 2 Power Windows 2-DoorÐXJ LEFT HAND DRIVE
JPOWER WINDOWS 8S - 3

Fig. 3 Power Windows 2-DoorÐXJ RIGHT HAND DRIVE
8S - 4 POWER WINDOWSJ

SWITCH TESTING
DRIVERS DOOR POWER WINDOW SWITCHÐ4-DOOR
JPOWER WINDOWS 8S - 5

DRIVERS DOOR POWER WINDOW SWITCHÐ2-DOOR LEFT HAND DRIVE
8S - 6 POWER WINDOWSJ

DRIVERS DOOR POWER WINDOW SWITCHÐ2-DOOR RIGHT HAND DRIVE
JPOWER WINDOWS 8S - 7

PASSENGER DOOR WINDOW SWITCH
8S - 8 POWER WINDOWSJ

WINDOW REGULATOR REPLACEMENT
REMOVAL
(1) Remove the interior door latch release assem-
bly and control panel retaining screws (Fig. 4).
(2) Disconnect the control linkage and the wire
harness connector.
(3) Remove the latch release and control panel as-
sembly.
(4) Remove the armrest lower retaining screws.
(5) Swing the armrest downward to a vertical po-
sition. This is necessary to disconnect the armrest
from the upper retainer clip (Fig. 5).
(6) Pull the armrest straight out from the trim
panel.To aid in removal of the trim panel, start at
the bottom of the panel.
(7) Remove the trim panel with a wide flat blade
tool (Fig. 6).
(8) Remove the plastic water dam sheet.
(9) Grind the heads off 2 rivets holding reinforce-
ment to door (Fig. 8). Knock rivets out with a ham-
mer and punch.
(10) Adjust window to allow access to Torx head
screw (Fig. 7).
(11) Remove 2 screws holding bottom of regulator
to door.
(12) Remove door glass attaching Torx head screw
(Fig. 7).
(13) Pull glass to the full up position and tape
glass to door.
Fig. 4 Power Window Control Panel Removal/
Installation
Fig. 5 Armrest Retainer Clip
Fig. 6 Trim Panel Removal
Fig. 7 Remove/Install Glass Attaching Screw
JPOWER WINDOWS 8S - 9