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120-3
120Ć3
Power Window System Components
The power window system consists of the following
components:
S
Driver Door Module (DDM)
S
Passenger Door Module (PDM)
S
Body Control Module (BCM)
S
LR power window switch
S
RR power window switch
S
Window up and window down relays in each of the
rear passenger window switches
S
Window lockout switch
S
Reversible power window motors in each of the
doors (circuit breaker protected)
S
LT DOOR CB 25A
(System power for left rear window)
S
RT DOOR CB 25A
(System power for right rear window)
Power Window System Controls
The power window system will operate anytime the
Retained Accessory Power (RAP) system is active or
when the ignition switch is in the ACCY or ON position.
The DDM contains four power window switches which
are integral components. Closing any of the normally
open, rocker type switches provides the DDM with a
request for power window operation. The switches for
the two front windows have three positions UP, Down
and Express Down, while the switches for the rear
windows have only two positions, UP and Down. Each
of these switches and their positions is a direct input
into the DDM. Upon receiving a request for power
window operation, the DDM, transmits a Class 2
message indicating the switch and it’s changed
position.
The PDM contains a single power window switch that is
an integral component. Closing of this normally open,
rocker switch provides the PDM with a request for the
front passenger power window operation. The switch
for the front passenger window has two positions Up
and Down. Each of these switch positions is a direct
input to the PDM.
The two rear passenger doors have there own
switches. Each of the switches contain a power window
up and down relay. A switch activation alone can control
the up and down functions of the rear windows.
However the BCM, upon receiving a Class 2 message
from the DDM, can control the set of relays which will
activate the rear window motors.
Power Window Motor Operation
A permanent magnet motor operates each of the power
side windows. Each motor raises or lowers the glass
when the motor receives voltage. The direction the
motor turns depends on the polarity of the supply
voltage. The power window switches control the
polarity of the supply voltage. A built-in circuit breaker
protects each motor. The circuit breaker opens when
the switch is depressed for a extended period of time
under the following conditions:
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The window has an obstruction.
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The window is fully open or fully closed.
The circuit breaker will reset automatically as the circuit
breaker cools.
Driver Power Window Operation
The switch for the driver power window has three
positions UP, Down and Express Down and its position
is a direct input into the DDM. Upon receiving a request
for power window operation (switch activation), the
DDM supplies voltage to the power window motor left
front up or down circuit and grounds the opposite and
the power window motor runs to move the window up or
down.
Circuit Operation
POWER WINDOWS
120-4
120Ć3
Front Passenger Power Window Operation
The switch for the front passenger power window has
two positions UP and Down, and its position is a direct
input into the PDM. Upon receiving a request for power
window operation (switch activation), the PDM supplies
voltage to the power window motor right front up or
down circuit and grounds the opposite and the power
window motor runs to drive the window up or down.
The front passenger power window can also be
controlled from the power window master switch. The
power window master switch for the front passenger
power window has three positions UP, Down and
Express Down and its position is a direct input into the
DDM. Upon receiving a request for front passenger
power window operation (switch activation), the DDM
transmits a Class 2 message indicating the changed
switch position. When the PDM receives this message,
the PDM supplies voltage to the power window motor
right front up or down circuit and grounds the opposite
and the power window motor runs to move the window
up or down.
Rear Passenger Power Window Operation
The passenger power window switches incorporate
window up and down relays. The supply side of all the
window up and down relays receive voltage through the
battery voltage supply circuit and the LT DOOR or RT
DOOR circuit breakers respectively. The normally
closed contacts of each relay is connected to ground.
The load side of each of the relays are connected to
either side of the power window motor through the
power window up and down circuits. The relay coil feed
circuits are connected to the BCM through the power
window lockout control circuit and the relay control
circuits are connected to the power window switches
and to the BCM.
If a rear power window switch is placed in the down
position, the down relay would energize and allow
battery voltage to the power window motor through the
power window motor down circuit. Since the opposite
side of the motor is connected to the normally closed
contacts of the up relay to ground through the power
window motor up circuit, the window moves down. If a
rear power window switch is placed in the up position,
the up relay would energize and allow battery voltage to
the power window motor through the power window
motor up circuit. Since the opposite side of the motor is
connected to the normally closed contacts of the down
relay to ground through the power window motor down
circuit, the window moves up.
The rear passenger power windows can also be
controlled from the power window master switch. The
power window master switches for the rear passenger
power windows have two positions UP and Down and
its position is a direct input into the DDM. Upon
receiving a request for rear passenger power window
operation (switch activation), the DDM transmits a
Class 2 message indicating the changed switch
position. When the BCM receives this message, the
BCM can control the rear window up and down relays.
Express Down Operation
The express down function controls both the driver and
front passenger power windows but only from the driver
door power window master switch. When either the
driver or front passenger window switch is momentarily
depressed to the express down position, it is a direct
input into the DDM. If the request was for the driver
power window, the DDM supplies voltage to the power
window down circuit continuously until the power
window reaches the bottom of its travel. At this point,
the DDM senses an over current situation on the power
window down circuit and interrupts the voltage supply. If
the request was for the front passenger power window,
the DDM transmits a Class 2 message indicating an
express down function was requested. When the PDM
receives this message, the PDM supplies voltage to the
power window down circuit continuously until the power
window reaches the bottom of its travel. At this point,
the PDM senses an over current situation on the power
window down circuit and interrupts the voltage supply.
Circuit Operation
POWER WINDOWS
120-5
120Ć3
Power Window Lockout Operation
The DDM contains a window lockout switch that is
responsible for the disabling of all the passenger
windows from the individual passenger window
switches. When the window lockout switch is activated,
the DDM transmits a Class 2 message indicating that a
window lockout request has been received. When the
PDM receives this message, it will disable the power
window motor up and down circuits. When the BCM
receives this message, it will interrupt the up and down
relay coil feed voltage for both rear doors. Once
activated, the lockout feature will remain in effect until
the ignition switch is cycled or the DDM receives
another power window lockout switch activation.
Circuit Operation
POWER WINDOWS
120-6
POWER WINDOWS
(Refer to Section 201 for photographs.)
Component
Photo No.
Body Control Module
(BCM)
On Rear Fuse Block, under left rear seat
53
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Driver Door Module (DDM)
On lower part of the driver door switch panel
95
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Front Passenger Door
Module (FPDM)
On lower part of passenger door switch panel
96
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Fuse Block-Rear
Under the left rear seat
52
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Quarter Glass Actuator-
Left
On left D-pillar
110
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Quarter Glass Actuator-
Right
On right D-pillar
110
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Quarter Glass Switch-Left
In upper console
91
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Quarter Glass Switch-
Right
In upper console
91
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Window Motor-Driver
In driver’s door
97
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Window Motor-Front
Passenger
In front passenger’s door
97
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Window Motor-LR
In left rear door
98
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Window Motor-Right Rear
In right rear door
98
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Connector
C305 (16-BLK)
Inside upper console
91
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C500 (12-BLK)
Midpoint of leading edge of left front door
93
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C600 (12-BLK)
Midpoint of leading edge of right front door
93
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C700 (17-NAT)
Midpoint of leading edge of left rear door
94
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C800 (17-NAT)
Midpoint of leading edge of right rear door
94
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Ground
G302
On the lower left B-pillar
105
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G303
On the lower right B-pillar
105
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G306
On body panel, left of rear door
109
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Component Location Index
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