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Jeep Grand Cherokee WK. Manual - part 544

DIAGNOSIS AND TESTING

POWER WINDOWS

For complete circuit diagrams, refer to the appropriate wiring information.

ALL WINDOWS INOPERATIVE

1. Check the circuit breaker. If OK, go to Step 2. If not OK, replace the inoperative circuit breaker.

2. Disconnect and isolate the battery negative cable. Remove the window/lock switch from the driver side front door

trim panel. Unplug the wire harness connector.

3. Check for continuity between the ground circuit cavity of the door module wire harness connector and a good

ground. If OK, go to Step 4. If not OK, repair the circuit to ground as required.

4. Connect the battery negative cable. Turn the ignition switch to the On position. Check for battery voltage at the

fused ignition switch output (run) circuit cavity of the window/lock switch wire harness connector. If OK, (Refer to
8 - ELECTRICAL/POWER LOCKS/POWER LOCK SWITCH - DIAGNOSIS AND TESTING). If not OK, repair the
circuit as required.

ONE WINDOW INOPERATIVE

The window glass must be free to slide up and down for the power window motor to function properly. If the glass
is not free to move up and down, the motor will overload and trip the integral circuit breaker. To determine if the
glass is free, disconnect the regulator from the glass. Then slide the window up and down by hand.

There is an alternate method to check if the glass is free. Position the glass between the up and down stops. Then,
shake the glass in the door. Check that the glass can be moved slightly from side to side, front to rear, and up and
down. Then check that the glass is not bound tight in the tracks. If the glass is free, proceed with the diagnosis that
follows. If the glass is not free, determine the cause of the condition.

If the only inoperative window is in the driver or passenger side front door and the preceding checks have not
identified a problem, (Refer to 8 - ELECTRICAL/POWER WINDOWS/WINDOW MOTOR - DIAGNOSIS AND TEST-
ING). If the problem being diagnosed involves only the Auto-down feature for the driver side front door window, but
all of the power windows are operational, replace the driver’s side window/lock switch. For diagnosis of the window/
lock switch, (Refer to 8 - ELECTRICAL/POWER LOCKS/POWER LOCK SWITCH - DIAGNOSIS AND TESTING).
For a rear power window problem proceed with the following:

1. Disconnect and isolate the battery negative cable. Unplug the wire harness connector from the power window

switch unit on the door with the inoperative power window. Check for continuity between the ground circuit cavity
of the power window switch wire harness connector and a good ground. There should be continuity. If OK, go to
Step 2. If not OK, repair the open circuit to the power window and door lock master switch as required.

2. Connect the battery negative cable. Turn the ignition switch to the On position. Check for battery voltage at the

fused ignition switch output (run) circuit cavity in the body half of the power window switch unit wire harness
connector. If OK, go to Step 3. If not OK, repair the open circuit to the power window and door lock master
switch as required.

3. Test the power window switch continuity (Refer to 8 - ELECTRICAL/POWER WINDOWS/POWER WINDOW

SWITCH - DIAGNOSIS AND TESTING). If OK, go to Step 4. If not OK, replace the power window switch.

4. Check the continuity in each circuit between the inoperative power window switch wire harness connector cavi-

ties and the corresponding power window motor wire harness connector cavities. If OK, (Refer to 8 - ELECTRI-
CAL/POWER WINDOWS/WINDOW MOTOR - DIAGNOSIS AND TESTING). If not OK, repair the open circuit(s)
as required.

NOTE: All passenger door power window switches receive their battery and ground feed for operating the
passenger door power window motors through the driver side power window and lock master switch and
wire harness connector.

8N - 336

POWER WINDOWS - SERVICE INFORMATION

MOTOR-WINDOW

DIAGNOSIS AND TESTING

WINDOW MOTOR

For complete circuit diagrams, refer to the appropriate wiring information.

1. Disconnect and isolate the battery negative cable. Remove the trim panel from the door with the inoperative

power window.

2. Unplug the power window motor wire harness connector. Apply 12 volts across the motor terminals to check its

operation in one direction. Reverse the connections across the motor terminals to check the operation in the
other direction. If the window is in the full up or full down position, the motor will not operate in that direction by
design. If OK, repair the circuits from the power window motor to the power window switch as required. If not
OK, replace the inoperative motor.

3. If the motor operates in both directions, check the operation of the window glass and lift mechanism through its

complete up and down travel. There should be no binding or sticking of the window glass or lift mechanism
through the entire travel range. If not OK, check the window glass, tracks, and regulator for sticking, binding, or
improper adjustment.

REMOVAL

The power window motor is integral to the power window regulator unit. If the power window motor is inoperative or
damaged, the entire power window regulator unit must be replaced. (Refer to 23 - BODY/DOOR - FRONT/WINDOW
REGULATOR - REMOVAL) or (Refer to 23 - BODY/DOORS - REAR/WINDOW REGULATOR - REMOVAL) for the
window regulator service procedures.

SWITCH-POWER WINDOW

DIAGNOSIS AND TESTING

POWER WINDOW SWITCH

The front door power window switches are included in the window/lock switch (Refer to 8 - ELECTRICAL/
POWER LOCKS/POWER LOCK SWITCH - DIAGNOSIS AND TESTING).

The Light-Emitting Diode (LED) illumination lamps for all of the power window switch knobs receive battery current
through the power window circuit breaker in the junction block. If all of the LEDs are inoperative in the power win-
dow switch and the power windows are inoperative, (Refer to 8 - ELECTRICAL/POWER WINDOWS - DIAGNOSIS
AND TESTING). If the power windows operate, but any or all of the LEDs are inoperative, the power window and
lock switch units with the inoperative LED(s) must be replaced. For complete circuit diagrams, refer to the appro-
priate wiring information.

1. Check the fuse and the circuit breaker. If OK, go to Step 2. If not OK, replace the fuse or circuit breaker.

2. Turn the ignition switch to the On position. Check for battery voltage at the power window fuse. If OK, turn the

ignition switch to the Off position and go to Step 3. If not OK, check circuit breaker and repair the circuit to the
ignition switch as required.

3. Disconnect and isolate the battery negative cable. Remove the power window switch from the door trim panel.

Unplug the wire harness connector from the switch.

4. Test the power window switch continuity. See the Power Window Switch Continuity chart to determine if the con-

tinuity is correct in the Neutral, Up and Down switch positions. If OK, (Refer to 8 - ELECTRICAL/POWER WIN-
DOWS - DIAGNOSIS AND TESTING). If not OK, replace the inoperative switch.

POWER WINDOWS - SERVICE INFORMATION

8N - 337

REAR POWER WINDOW SWITCH CONTINUITY CHART

SWITCH POSITION

CONTINUITY BETWEEN

NEUTRAL

PIN 3 & 4, PIN 1 & 2

PIN 6 & 3, PIN 1 & 2

DOWN

PIN 6 & 2, PIN 3 & 4

REMOVAL

The driver and front passenger side power window switch is included in the window/lock switch. (Refer to 8
- ELECTRICAL/POWER LOCKS/POWER LOCK SWITCH - REMOVAL) for the service procedures.

1. Disconnect and isolate the battery negative cable.

2. Remove the door trim panel (Refer to 23 - BODY/

DOORS - REAR/TRIM PANEL - REMOVAL).

3. Remove switch from door trim panel.

INSTALLATION

The driver and front passenger side power window
switch is included in the window/lock switch.
(Refer to 8 - ELECTRICAL/POWER LOCKS/POWER
LOCK SWITCH - INSTALLATION).

1. Install the switch to the door trim panel.

2. Install the door trim panel (Refer to 23 - BODY/

DOORS - REAR/TRIM PANEL - INSTALLATION).

3. Connect the battery negative cable.

8N - 338

POWER WINDOWS - SERVICE INFORMATION

RESTRAINTS

TABLE OF CONTENTS

page

RESTRAINTS - ELECTRICAL DIAGNOSTICS . . . . . 1

RESTRAINTS - SERVICE INFORMATION . . . . . . 427

RESTRAINTS - ELECTRICAL DIAGNOSTICS