POWER WINDOWS
TABLE OF CONTENTS
page page
POWER WINDOWS
DESCRIPTION ..........................9
OPERATION ............................9
DIAGNOSIS AND TESTING - POWER
WINDOWS ............................9
POWER WINDOW SWITCH
DESCRIPTION .........................10
OPERATION ...........................10
DIAGNOSIS AND TESTING - POWER
WINDOW SWITCH .....................10
REMOVAL .............................10
INSTALLATION .........................10
WINDOW MOTOR
DESCRIPTION .........................10
OPERATION ...........................11
DIAGNOSIS AND TESTING - WINDOW
MOTOR .............................11
POWER WINDOWS
DESCRIPTION
The power window system is activated through
switches located in the console panel center bezel.
The window lift motors are of the permanent magnet
type with a hall effect sensor used for motor position.
OPERATION
POWER WINDOWS
A battery positive and negative connection to
either of the two motor terminals will cause the
motor to rotate in one direction. Reversing current
through these same two connections will cause the
motor to rotate in the opposite direction. Each motor
is controlled by the Body Control Module (BCM).
The BCM controls the logic for the power windows.
The BCM receives a muxed input from each window
switch. The BCM uses the information to control the
operation of the power windows if the ignition is in
Run or Accessory (including delay).
An auto-down feature allows either window to be low-
ered all the way, even if the window switch is released.
Each window has a switch that must be depressed in
the down direction to a second detent to begin the auto-
down function. Depressing the switch again in any
direction will immediately stop the window.
Another feature is Smart Glass. The window glass
is designed to slide up into a seal to prevent the win-
dows from “popping” out at high speeds. To prevent
the glass from hanging up on the seal, the BCM
drops the glass when the door is opened, and returns
it to the full up position once the door is closed.
SMART GLASS FEATURE
The Smart Glass feature of the power window sys-
tem drops the window 10 mm when the doors are
unlatched. This allows the window glass to clear the
weather strip that the glass seals in.
The distance the windows drop is based on the
learned “up stop” of the window. Each power window
motor has a Hall effect switch that the Body Control
Module (BCM) uses to monitor window movement.
When the window stops moving while the switch is
still being pressed, it memorizes this position as the
“up stop” and calculates the window drop from this
position. The Hall effect switch is also used by the
BCM to shut off electrical current to each power win-
dow motor when it has stopped moving.
DIAGNOSIS AND TESTING - POWER
WINDOWS
Any diagnosis of the Power Windows system
should begin with the use of scan tool and the
appropriate Diagnostic Service Manual.
Refer to the appropriate wiring information. The
wiring information includes wiring diagrams, proper
wire and connector repair procedures, details of wire
harness routing and retention, connector pin-out
information and location views for the various wire
harness connectors, splices and grounds.
This wiring test determines whether or not voltage
is continuous through the wiring harness to the
power window switch.
Remove switch for testing (Refer to 8 - ELECTRI-
CAL/POWER WINDOWS/POWER WINDOW
SWITCH - REMOVAL). Connect the voltmeter posi-
tive lead to pin 1 and the negative lead to pin 2 of
the switch wire harness connector. Voltmeter should
read approximately 5 volts. If OK, (Refer to 8 -
ELECTRICAL/POWER WINDOWS/POWER WIN-
DOW SWITCH - DIAGNOSIS AND TESTING). If not
OK, check for a broken wire.
ZB POWER WINDOWS 8N - 9
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