Power Windows

Power Windows Description and Operation

Power Windows System Components

The power windows system consists of the following components:

* Body control module.
* Driver door lock/window switch
* Passenger door lock/window switch.
* Left rear window switch.
* Right rear window switch
* Driver window motor
* Passenger window motor
* Left rear window motor
* Right rear window motor
* DR/LCK fuse (15-amp)
* PDM fuse (15-amp)
* PWR/WNDW Circuit Breaker (25-amp) - front
* LT/REAR/WNDW fuse (15-amp) - rear
* REAR/WNDW fuse (15-amp) - rear

Driver Power Window Operation

The switch for the driver power window has 4 positions; up, down, express up and express down and its position is a direct input into the driver door lock/window switch. When the driver power window motor module receives a serial data message from the driver door lock/window switch, the driver power window motor module will apply power and ground to the driver door window motor to move the window as requested.

The driver door contains a window motor that is a smart motor and 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.

Front Passenger Power Window Operation

The driver door contains a window motor that is a smart motor and 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 front passenger power window can also be operated from a switch on the driver door lock/window switch. The right front switch on the driver door lock/window switch has 4 positions up, down, and express up and express down and its position is a direct input into the driver door lock/window switch. Upon receiving a request for front passenger power window operation, the driver door lock/window switch transmits a serial data message indicating the changed switch position to the body control module (BCM) which then sends a command to the passenger door lock/window switch. When the passenger door lock/window switch receives a passenger door window switch request from the BCM, it will send a command to the passenger power window motor module which will apply power and ground to the passenger door window motor to move the window as requested.

The passenger door contains a window motor that is a smart motor and 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.

Rear Window Operation (Sedan/Wagon)

The rear passenger power window switches have their own battery voltage and respective grounds, when the switch is pushed down or pulled up, the logic circuit within the rear passenger power window switch will provide power and ground to the window motor causing the window to open or by reversing polarity, the window will close.

The rear power windows can also be operated from switches on the driver door lock/window switch. When the rear switches on the driver door lock/window switch are pushed down or pulled up, their position is signaled to the BCM via the driver door lock/window switch. When the BCM receives this command, the appropriate signal is sent to the rear door window switch which will provide power and ground to the window motor causing the window to open or close.

Rear Window Lockout Feature

The rear window lockout function is operated from the driver door lock/window switch, when the rear window lockout switched is pressed, an indicator light will illuminate and a serial message will be sent to the BCM via the driver door lock/window switch. When the BCM receives a lockout command, the rear door power window switches will be disabled (rear window operation is still possible from the driver door lock/window switch). Once activated, the rear power window switches will be disabled until the ignition switch is cycled or the switch is pressed again to enable the rear window switches.