2-10
Fixed and Moveable Windows
Description and Operation
Power Windows Description and
Operation
Power Windows System Components
The power window system consists of the following
components:
•
Driver window switch
•
Passenger window switch
•
Left rear window switch
•
Right rear window switch
•
Window motors in each of the doors
•
30A Fuse
•
Body control module (BCM)
3461357
Driver Express Up and Express Down
Power Window Motor
The driver door contains a window motor is smart motor
that will detect excessive resistance while performing
the express up function and automatically reverse
direction to prevent injury to any occupants that may
become trapped between the closing window and the
door frame. The automatic reverse safety feature can
be overridden by pulling and holding the window
switch.
The logic circuit within the window motor monitors the
up, down and express signal circuits which are
normally equal to B+ voltage. When a switch is used on
the driver window switch, the contacts close causing a
voltage drop within the appropriate signal circuit. The
driver window motor will detect the voltage drop and will
command the window to move in the direction
requested.
Passenger, Left Rear and Right Rear
Express Down Window Motors
For the passenger, right rear and left rear doors, when
their window switch is pressed in the down position,
battery positive voltage is applied to their respective
window motor control circuit and ground to the other
window motor control circuit causing that window to
open. When the individual window switch is pulled in
the up position, voltage and ground is applied to the
window motor in the opposite direction causing that
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual
