Circuit/System Description
The HVAC control module monitors the voltage level on the supply voltage circuit of the RR DEFOG relay. The voltage level should be low while the RR DEFOG relay is de-energized. The voltage will be near system voltage when the HVAC control module energizes the RR DEFOG relay.
The driver power window motor communicates with the driver door lock/window switch over the serial data link. The motor contains a logic module which must be normalized or programmed any time the window motor is serviced to provide proper operation and communication between door lock/window switch and the window motor.
The passenger door module (PDM) controls the power window functions through the power window motor up and down control circuits. The PDM monitors the control circuits for fault conditions when the up or down operation is requested prior to activating the function and during the operation.
The body control module (BCM) monitors the window UP and DOWN request from the driver window switch. 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 0.5 volts and the appropriate rear window switch will then command the window in the UP or DOWN direction.
The body control module (BCM) supplies voltage to the rear window switches allowing for normal window operation from the rear switches. If the rear window lockout function is enabled, the BCM will not supply voltage to the rear window switches and the rear windows will only operate when the BCM receives a command to operate the appropriate rear window UP or DOWN from the driver door module (DDM).
When the rear defogger button is pressed, voltage is supplied to the relay coil by the HVAC control module which also illuminates the rear window defogger indicator. B+ voltage is supplied at all times to the relay switched input and the relay coil is always grounded. This allows battery positive voltage from the relay switched input through the switch contacts and out the relay switched output to the rear window defogger.
The front and rear power windows are controlled by the driver door lock/window switch and passenger door lock/window switch. The driver door lock/window switch and passenger door lock/window switch each contain power window switches that are integrated into the module. The driver door lock/window switch contains the master power window switches that control all power window operations. The power window switch contained in the passenger door lock/window switch controls the front passenger window operation only.
When the driver power window switch is activated to a desired position, the driver door lock/window switch examines the request and checks for messages from other vehicle control modules prohibiting window movement. If no prohibitive messages have been received, the driver door lock/window switch will send a serial data message to the driver door window motor to move the window to the desired position.
When the driver door lock/window switch receives a request to operate the right side passenger windows from the master switch, a serial data message is sent to the passenger door lock/window switch. The passenger door lock/window switch examines the request and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been received, the passenger door lock/window switch will command the window motor to move the window as requested.
When the driver door lock/window switch receives a request to operate a rear window from the master switch, a serial data message is sent to the BCM. The BCM examines the request and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been received, the BCM will send a serial data message to the appropriate rear window switch which will command the window motor as requested.
The power window system will operate any time the ignition is in the ACC or RUN position. The power window system will also operate whenever the body control module (BCM) is in the retained accessory power (RAP) mode. The driver power window switch contains individual window switches for each of the power windows. All windows may be controlled up and down from the driver master control. The individual passenger power window switches will only control the up and down operation of their respective power window.
Each power window contains a reversible power window motor. The direction the window travels is dependent upon the polarity of the supply voltage. By reversing polarity of the supply voltage the window motor will move up or down. Each power window motor is internally circuit breaker protected.
Battery voltage is supplied to each power window switch through the accessory voltage supply circuit. The power window switch also receives a constant ground source. The power window motor control circuits are connected to ground through the normally closed up and down contacts of the power window switch. When the power switch is placed in the down position, the power window motor down control circuit is switched to 12 V and is applied to the down side of the power window motor. Since the other side of the power motor is connected to ground through the normally closed contacts of the up switch, the window travels down. By placing the power window switch in the up position, the polarity of the power window motor is reversed and the window travels up.
Power Window System Operation
The driver window switch contains 4 power window switches which are integral components to the driver door lock/window switch. Closing any of the normally open switches provides the driver door lock/window switch with a request for power window operation. The switches for the driver window will have 4 positions up, down and express up and express down, the passenger window depending upon the option configuration may have 3 or 4 positions for up, down and express down and possibly express up while the switches for the rear windows have only 2 positions; up and down. Each of these switches and their positions is a direct input into the driver door lock/window switch. Upon receiving a request for power window operation, the driver door lock/window switch, transmits a serial data message indicating the switch and it's changed position.
The 2 rear passenger doors have their own switches. A switch activation alone can control the up and down functions of the rear windows. However the BCM, upon receiving a serial data message from the driver door lock/window switch, will send a signal to the appropriate rear window switch which will command their respective rear window motors.
Driver Power Window Operation RPO AXE
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 RPO AXC
The switch for the front passenger power window has 4 positions; up, down, express up and express down and its position is a direct input into the passenger door lock/window switch. When the passenger power window motor module receives serial data message from the passenger door lock/window switch, the passenger power window motor module will apply power and ground to the passenger door window motor to move the window as requested.
The front passenger power window can also be operated from the driver master control. The right front window switch on the driver master control 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 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.
Front Passenger Power Window Operation Without RPO AXC
The switch for the front passenger power window has 3 positions up, down and express down and its position is a direct input into the passenger door lock/window switch, when the switch is pushed down or pulled up, the logic circuit within the 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 front passenger power window can also be operated from a switch on the driver master control. When the right front window switch on the driver master control is pushed down or pulled up, it's 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 passenger door lock/window switch which will provide power and ground to the window motor causing the window to open or close.
Rear Passenger Power Window Operation
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 passenger power windows can also be operated from switches on the driver master control. When the rear passenger window switches on the driver master control 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 Power Window Lockout Operation
The rear window lockout function is operated from the driver master control, 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 are disabled. 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.
Driver Power Window Operation
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 left front up or down circuit and grounds the opposite and the power window motor runs to move the window up or down.
Front Passenger Power Window Operation
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 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 DDS. The front passenger window switch on the DDS has 3 positions UP, Down and Express Down and its position is a direct input into the DDS. Upon receiving a request for front passenger power window operation, the DDS transmits a command signal 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 rear passenger power windows can also be operated from the DDS. The rear passenger window switches on the DDS has 2 positions, UP and Down and its position is a direct input into the DDS. Upon receiving a request for rear passenger power window operation, the DDS transmits a command signal indicating the changed switch position. When the RPDS receives this message, the RPDS supplies voltage to the respective power window motor up or down circuit and grounds the opposite and the power window motor runs to move the window up or down.
The rear window lockout function is operated from the DDS through a command signal to the RPDS. When the RPDS 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.
Rear Window Defogger Operation
When you depress the rear defogger switch, voltage is supplied to the RR DEFOG relay coil and the HVAC control module also illuminates the rear window defogger indicator. Battery positive voltage is supplied at all times to the RR DEFOG relay switched input and the RR DEFOG relay coil is always grounded. This allows battery positive voltage from the relay switched input through the switch contacts and out the relay switched output to the rear window defogger. The HVAC module also sends a message to the driver door module (DDM) and passenger door module (PDM) on the GMLAN serial communication circuit to activate the heated mirrors, if equipped
When you turn ON the ignition and press the rear window defogger switch for the first time, the defogger cycle lasts 10 minutes. Further operation results in 5-minute defogger cycles.
Urethane Adhesive Description
For replacement of any adhesive-installed window, use the full cut method only.
Use an adhesive that is approved by GM, Specification GMW-15672.
Use these materials based on specific manufacturer. Do NOT intermix primers or adhesives from one manufacturer to another.
Always follow the system manufacturers instructions for application, handling and curing.