Chevrolet Trax: 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 or window motors in the front doors only 30A Fuse
• Body control module (BCM)

Power Window System

This vehicle can be configured as follows:

• All doors with express up and express down window motors
• Driver and passenger doors with express up and express down power window motors with left rear and right rear express down only window motors
• Driver with express up and express down power window motor with passenger, left rear and right rear express down only power window motors
• Driver with express up and express down power window motor and passenger, left rear and right rear power window motors without any express functions
• All doors window motors without any express functions
• Driver and passenger doors with power window motors without any express functions with rear door manual crank windows

14 Power Windows AXG-AEF-AER Block Diagram

Fig. 61: 14 Power Windows AXG-AEF-AER Block Diagram

Driver and Passenger Express Up and Express Down Window Motors

The driver and passenger doors 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 window switch, the contacts close causing a voltage drop within the appropriate signal circuit. The window motor will detect the voltage drop and will command the window to move in the direction requested.

The driver window switch communicates to the BCM by a serial data circuit. When the driver wishes to control the passenger window, the driver will use the appropriate switch on the driver window switch. When this switch is used, a serial data message is sent to the BCM requesting the passenger window motor command, the BCM will then send a serial data message to the passenger window motor which will then move in the direction requested.

Left Rear, Right Rear Express Up and Express Down Window Motors

The left rear and right rear doors 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 appropriate rear window switch, the contacts close causing a voltage drop within the appropriate signal circuit. The window motor will detect the voltage drop and will command the window to move in the direction requested.

The driver window switch communicates to the BCM by a serial data circuit. When the driver wishes to control a rear window, the driver will use the appropriate switch on the driver window switch. When this switch is used, a serial data message is sent to the BCM requesting the rear window motor command, the BCM will then send a serial data message to the rear window motor which will then move in the direction requested.

14 Power Windows AEC-AER-AEQ Block Diagram

Fig. 62: 14 Power Windows AEC-AER-AEQ Block Diagram

All Doors with Express Down Window Motors

For the driver, 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 window to close. The return path to ground is supplied through the inactive control circuit being normally grounded through the window switch.

Each window switch communicates to the BCM by a serial data circuit. When the driver wishes to control the passenger, left rear or right rear window, the driver will use the appropriate switch on the driver window switch.

When this switch is used, a serial data message is sent to the BCM requesting a window motor command, the BCM will then send a serial data message to the appropriate door window switch which will then command that window to move in the direction requested.

14 Power Windows A55-A33-A66 Block Diagram

Fig. 63: 14 Power Windows A55-A33-A66 Block Diagram

Power Windows Without Express Functions

The driver power window switch contains switches that controls the functions of the driver window motor and also allows the driver to remotely control the functions of the passenger, left rear and right rear power window motors Battery voltage is supplied to the driver power window switch through the accessory voltage supply circuit. The driver 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 driver power window switch.

When the driver 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 driver power window motor. Since the other side of the driver power motor is connected to ground through the normally closed contacts of the up switch, the driver window travels down. By placing the driver power window switch in the up position, the polarity of the driver power window motor is reversed and the window travels up.

Battery voltage is supplied to the front passenger power window switch through the accessory voltage supply circuit. Ground for the passenger power window motor is supplied through normally closed up and down contacts of both the front passenger power window switch and the driver power window switch. When the front passenger power window 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 front passenger power window motor. Since the other side of the front passenger power motor is connected to ground through the normally closed up contacts of both the front passenger and driver power window switches, the window travels down. By placing the front passenger power window switch in the up position, the polarity of the power window motor is reversed and the window travels up.

The rear power window switches receive battery voltage through the window lockout control circuit if the window lockout function is disabled. Ground for the rear passenger power window motors is supplied through normally closed up and down contacts of both the rear passenger power window switches and the driver power window switch. When the either rear passenger power window 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 rear passenger power window motor. Since the other side of the rear passenger power motor is connected to ground through the normally closed up contacts of both the rear passenger and driver power window switches, the window travels down. By placing the rear passenger power window switch in the up position, the polarity of the power window motor is reversed and the window travels up.

Lockout Switch Feature

The driver power window switch contains a window lockout switch, when the driver presses the window lockout switch, a serial data message is sent to the BCM which will send a disable command to the rear window switches, deactivating them. The rear windows will still function normally from the switches on the driver window switch.

For vehicles without express functions, the driver power window switch contains a window lockout switch. The window lockout switch completes or interrupts the window lockout control circuit. If the window lockout switch is enabled, there is no voltage available at the rear power window switches and rear power window will not operate from the rear power window switches. The rear power windows will operate from the driver power window switch.

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