OPERATION
A positive and negative battery connection to the
two motor terminals will cause the power window
motor to rotate in one direction. Reversing the cur-
rent through these same two connections will cause
the motor to rotate in the opposite direction.
Because the Body Control Module (BCM) drives
the window, it can sense when the top and bottom
travel has been reached and stop driving the window
regardless of the window switch position (no hall
pulses within 50 mSeconds). The BCM considers the
Hall Effect faulted if no pulses are sensed when the
window is driven up and down. When this condition
is detected, the BCM will activate the motor until the
switch is released or a stuck fault is set (10 seconds).
In addition, each power window motor is equipped
with an integral self-resetting circuit breaker to pro-
tect the motor from overloads.
The driver side motor is controlled directly by the
BCM. The passenger side motor receives current
through a window up relay and a window down relay.
These are located near the steering column. The up
and down window relays are controlled by the BCM.
There is also a 30 Amp fuse in the Power Distribu-
tion Center (PDC) to protect the passenger window
circuits. The BCM protects the driver window circuits
(10 amps).
DIAGNOSIS AND TESTING - WINDOW MOTOR
(1) Remove door trim panel
(2) Connect positive (+) lead from a test battery to
the window motor(s) that is inoperative to either of
the two motor terminals.
(3) Connect negative (-) lead from test battery to
remaining motor terminal.
(4) The motor should now rotate in one direction to
either move window up or down.
(a) If window happens to already be in full UP
position and motor is connected so as to move it in
UP direction no movement will be observed.
(b) Likewise, motor connected to move window
in DOWN direction no movement will be observed
if window is already in full DOWN position.
(c) Reverse battery leads and window should
now move. If window does not move, check for
binding or obstructions. If no binding is present,
replace the motor.
(5) If window moved completely up or down, the
test leads should be reversed one more time to com-
plete a full window travel inspection.
(6) The window motor(s) are replaced with the
window regulator. If they are found to be faulty, a
complete replacement will be necessary (Refer to 23 -
BODY/DOOR - FRONT/WINDOW REGULATOR -
REMOVAL).
ZB POWER WINDOWS 8N - 11
WINDOW MOTOR (Continued)
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