Power Window Motor Description And Operation; Power Window System Diagnosis And Testing; All/One Window Inoperative; Door Module - Jeep 200 Cherokee Service Manual

8S - 2 POWER WINDOW SYSTEMS
DESCRIPTION AND OPERATION (Continued)
between the terminals of the power window motor.
The passenger side front door and, on four-door mod-
els, both rear door power window switches receive
their battery feed through the power window lockout
switch or through the master switches in the DDM.
Also, each of the individual power window switches
receives its ground through the DDM. When the lock-
out switch is placed in the Lock position, the individ-
ual power window switches become inoperative
because they have no battery current available to
them. However, the master switches are unaffected
by the lockout switch position.
Each power window switch, except the lockout
switch, is illuminated by a Light-Emitting Diode
(LED) when the ignition switch is turned to the On
position. However, when the power window lockout
switch is placed in the Lock position, the LED for the
locked-out passenger side front and, on four-door
models, the rear passenger door power window
switches is turned off.
The front door power window switches and their
lamps cannot be repaired and, if faulty or damaged,
the entire door module must be replaced. The rear
door power window switches and their lamps cannot
be repaired but, if faulty or damaged, only the
affected switch unit must be replaced.

DOOR MODULE

A Driver Door Module (DDM) and a Passenger
Door Module (PDM) are used on all models equipped
with power locks and power windows. Each door
module houses both the front door power lock and
power window switches. In addition to the switches
for its own door, the DDM houses individual switches
for each passenger door power window, a power win-
dow lockout switch, the power mirror switch, and cir-
cuitry to support the one-touch down feature of the
driver side front door power window. The PDM also
houses the control circuitry and the power lock and
unlock relays for the power lock system.
The DDM and the PDM are mounted to their
respective front door trim panels. The DDM and
PDM are serviced individually and cannot be
repaired. If the DDM or PDM, or any of the switches
and circuitry that they contain are faulty or dam-
aged, the complete DDM or PDM unit must be
replaced.
POWER WINDOW MOTOR
A permanent magnet reversible motor moves the
window regulator through an integral gearbox mech-
anism. A positive and negative battery connection to
the two motor terminals will cause the motor to
rotate in one direction. Reversing the current
through these same two connections will cause the
motor to rotate in the opposite direction.
In addition, each power window motor is equipped
with an integral self-resetting circuit breaker to pro-
tect the motor from overloads. The power window
motor and gearbox assembly cannot be repaired and,
if faulty or damaged, the entire power window regu-
lator assembly must be replaced.

CIRCUIT BREAKER

An automatic resetting circuit breaker in the junc-
tion block is used to protect the power window sys-
tem circuit. The circuit breaker can protect the
system from a short circuit, or from an overload con-
dition caused by an obstructed or stuck window glass
or regulator.
The circuit breaker cannot be repaired and, if
faulty, it must be replaced.
DIAGNOSIS AND TESTING
POWER WINDOW SYSTEM
For circuit descriptions and diagrams, refer to
8W-60 - Power Windows in Group 8W - Wiring Dia-
grams.
ALL WINDOWS INOPERATIVE
(1) Check the circuit breaker in the junction block,
as described in this group. If OK, go to Step 2. If not
OK, replace the faulty circuit breaker.
(2) Disconnect and isolate the battery negative
cable. Remove the driver side front door trim panel
and unplug the Driver Door Module (DDM) wire har-
ness connectors from the DDM. Check for continuity
between the ground circuit cavity of the 8-way DDM
wire harness connector and a good ground. If OK, go
to Step 3. If not OK, repair the circuit to ground as
required.
(3) Connect the battery negative cable. Turn the
ignition switch to the On position. Check for battery
voltage at the master switch power feed (run/acc) cir-
cuit cavity of the 12-way DDM wire harness connec-
tor. If OK, see the diagnosis for the Door Module in
this group. If not OK, repair the open circuit to the
circuit breaker in the junction block as required.
ONE WINDOW INOPERATIVE
The window glass must be free to slide up and
down for the power window motor to function prop-
erly. 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 plate 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
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