Power Windows Description and Operation Side Windows

The power window system consists of the following components:

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 driver master control switches are integrated into the DDS. When a power window switch is activated in the up or down positions the DDS supplies power and ground to the window motor control circuits to drive the window motor in the required direction. Prior to activating a power window motor the DDS will supply the control circuit with a low current bias voltage in order to determine that a short to ground condition does not exist and during window motor operation the DDS continues to monitor the motor current to verify proper window motor operation.

The DDS controls the passenger window through a GMLAN message to the PDS. When a power window switch is activated in the up or down positions the PDS supplies power and ground to the window motor control circuits to drive the window motor in the required direction. Prior to activating a power window motor the PDS will supply the control circuit with a low current bias voltage in order to determine that a short to ground condition does not exist, and during window motor operation the PDS continues to monitor the motor current to verify proper window motor operation. (Scan tool support is available for this system)

The switch for the driver power window has 3 positions Up, Down and Express Down and it's position is a direct input into the DDS. Upon receiving a request for power window operation (switch activation), the DDS supplies voltage to the power window motor up or down circuit and grounds the down or up circuit and the power window motor moves the window UP or DOWN direction.

The switch for the front passenger power window has 2 positions UP and DOWN, and it's position is a direct input into the PDS. Upon receiving a request for power window operation (switch activation), the PDS 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 operated from the driver master control. The front passenger window switch on the driver master control has 2 positions UP and DOWN and it's position is a direct input into the DDS. Upon receiving a request for front passenger power window operation, the DDS transmits a GMLAN message indicating the changed switch position. When the PDS receives this message, the PDS 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.

The body control module (BCM) monitors the window UP/DOWN command from the DDS. When the rear window UP or DOWN command is received, the BCM sends a signal to the appropriate rear window switch. The rear window switches continuously monitor the up and down signal circuits, if no function is being commanded, the signal voltage is at approximately B+ voltage. If the UP or DOWN function is commanded, the BCM signal voltage drops approximately 5 volts and the appropriate rear window switch will then command the window in the UP or DOWN direction.

The BCM monitors the window lockout command from the DDS. When the rear window switch operation is authorized, the BCM sends a signal to the rear window switches allowing for normal window operation from the rear switches. If the rear window lockout function is commanded, the BCM signal voltage drops approximately 5 volts which disables the rear window switches and the rear windows will only operate when the BCM receives a command from the driver master control. The lockout feature will remain in effect until the ignition switch is cycled or the driver enables the rear windows by pressing the rear window lockout switch again.

The power window system will operate anytime the RAP system is active or when the ignition switch is in the ACCY or ON position.

The driver and passenger door lock and side window switches are integrated control assemblies. The driver and front passenger window switches are normally open, 3 position rocker type switches, with detents for Up, Down, and Express Down. The driver window master control rear passenger window switches are normally open, 2 position rocker type switches, with detents for Up and Down. The driver window master control rear window lockout switch is a push button type switch that provides an active signal to the driver window switch whenever pressed. Whenever the rear window lockout switch is pressed the driver window switch will enable or disable the function of the rear window switches depending on the current state, and illuminate the switch indicator whenever the function is active. (No scan tool support for this system)

The switch for the driver power window has 3 positions UP, Down and Express Down and it’s position is a direct input into the driver window switch. Upon receiving a request for power window operation (switch activation), the driver window switch 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.

The switch for the front passenger power window has 3 positions UP, Down and Express Down and it’s position is a direct input into the passenger window switch. Upon receiving a request for power window operation (switch activation), the passenger window switch 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 operated from the driver window switch. The right front window switch on the driver master control has 3 positions Up, Down and Express Down and its position is a direct input into the driver window switch. Upon receiving a request for front passenger power window operation, the driver window switch transmits a command signal indicating the changed switch position. When the passenger window switch receives this message, the passenger window switch 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.

The rear passenger power windows can also be operated from the driver window switch. The left rear and right rear window switches on the driver master control has 2 positions, Up and Down, and its position is a direct input into the driver window switch. Upon receiving a request for rear passenger power window operation, the driver window switch transmits a command signal to the appropriate rear window switch which receives this message, the rear window switch then supplies voltage to the power window motor up or down circuit and grounds the down or up circuit and the power window motor runs to move the window up or down.

The rear window lockout function is operated from the driver master control through a command signal to the rear door power window switches. When the rear door power window switches receives an active lockout command, the rear door power window switches are disabled and the indicator lamp on the lockout switch will illuminate. Once disabled, the lockout feature will remain in effect until the ignition switch is cycled or the driver enables the rear windows by pressing the rear window lockout switch again.

Power Windows Description and Operation Rear Window

The power sliding rear window motor is controlled from the rear window open/close switch through open and close relays. The open/close switch is supplied voltage from the body control module (BCM) accessory voltage output circuit. When the switch is pressed in the open or closed position the open or closed relay coil will be supplied accessory voltage and energized through the appropriate relay control circuit. While the open and close relays are in a de-energized state both motor control circuits will be closed to ground. When one of the relays is energized its motor control circuit will be closed to the battery voltage supply circuit and the other motor control circuit will remain grounded through the de-energized relay.