Circuit/System Description
The HVAC control module monitors the voltage level on the supply voltage circuit of the REAR DEFOG relay. The voltage level should be low while the REAR DEFOG relay is de-energized. The voltage will be near system voltage when the HVAC control module energizes the REAR DEFOG relay.
The driver door switch (DDS) and passenger door switch (PDS) control the power window functions through the power window motor up and down control circuits. The door switches monitor the control circuits for fault conditions when up or down operation is requested prior to activating the function and during operation.
The body control module (BCM) monitors the window UP/DOWN command from the driver door switch (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 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) monitors the window lockout command from the driver door switch (DDS). When the rear window switch operation is authorized, the the BCM signal voltage drops approximately 5 volts 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 is at B+ voltage which disables the rear window switches and the rear windows will only operate when the BCM receives a command from the driver master control.
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 power sliding rear window motor is controlled from the sliding rear window switch through OPEN and CLOSE relays. The sliding rear window switch is supplied voltage from the body control module (BCM) accessory voltage output circuit. When the switch is pressed in the OPEN or CLOSE position, the sliding rear window open relay or the sliding rear window close relay coil will be supplied accessory voltage and energized through the appropriate relay control circuit. While the sliding rear window open relay or the sliding rear window close relay 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.
The driver and passenger door lock and side window switches are integrated control module switch assemblies. When a power window switch is activated in the up or down positions the driver door switch (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 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 volts 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.
Urethane Adhesive Description
Use the for replacement of any adhesive-installed window using the full cut method.
Use adhesive systems which meet GM Specification GM 3651G.
Use these materials based on specific manufacturer. Do NOT intermix primers or adhesives from one manufacturer to another.
Always follow the system manufacturer's instructions for application, handling, and curing.
Stationary Window Description
Most stationary windows, specifically windshields, are retained to the body with urethane adhesive which adheres the window to the body, increasing structural integrity. The reinstallation of the windows with urethane adhesive requires complete replacement of the urethane adhesive bead, and is known as the full cut method.
Driver Power Window Operation (RPO A31/AN3/DL3)
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.
Front Passenger Power Window Operation (RPO A31/AN3/DL3)
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.
Rear Passenger Power Window Operation (RPO A31/AN3/DL3)
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.
Rear Power Window Lockout Operation (RPO A31/AN3/DL3)
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.
Driver Power Window Operation (RPO A31 W/O AN3, DL3)
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.
Front Passenger Power Window Operation (RPO A31 W/O AN3, DL3)
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.
Rear Passenger Power Window Operation (RPO A31 W/O AN3, DL3)
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.
Rear Power Window Lockout Operation (RPO A31 W/O AN3, DL3)
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.
Rear Window Defogger Operation
When the rear defogger switch is pressed, the HVAC control module will illuminate the rear window defogger indicator and will supply voltage to the defog relay coil. Battery positive voltage is supplied at all times to the defog relay switched input and the defog relay coil is always grounded. This allows battery positive voltage from the relay switch contacts to the rear window defogger grid. The HVAC module also sends a request to the driver door module and passenger door module to activate the heated mirrors, if equipped.
When the rear window defogger is initially activated, the defogger cycle will last 10 minutes, further requests will result in 5 minute defogger cycles.