Power Windows System Components
The power window system consists of the following components:
| • | LF power window switch. |
| • | RF power window switch. |
| • | Power Window Control Module (Express Down Feature). |
| • | Power window motors in each of the doors. |
| • | Power window system circuit breaker (WINDOWS Circuit Breaker 30A). |
Power Windows System Controls
The power windows system can be controlled by any of the following:
| • | The Body Control Module controls the RAP relay which in turn supplies
power to the power window system. The Body Control Module must be requesting
the RAP relay to energize, or the ignition switch must be in the RUN or
ACCY position for the power window system to operate. |
| • | A power window, up or down, switch activation. |
| • | A power window switch input to the Power Window Control Module
for the driver's window express down feature. |
Important: The power windows system has voltage applied to it through the Windows
circuit breaker. The body control module (BCM) contains the Retained
Accessory Power (RAP) subsystem. When active, the RAP subsystem
allows the windows to operate for 10 minutes after the ignition is
turned off or until a door is opened. Refer to
Retained Accessory Power (RAP) Description and Operation
in Retained
Accessory Power for a complete understanding of RAP operation.
When the ignition switch is in the RUN position or the ACCY position
or the BCM is in the RAP mode, voltage is applied to the Windows circuit breaker.
The battery positive voltage circuit from the Windows circuit breaker applies
voltage to the driver window switch, the passenger window switch, and the
power window control module. The window motors and switches are grounded through
the driver window switch. The passenger window can be operated from the passenger
window switch and the driver window switch. The driver window can only be
operated from the driver window switch. The windows are driven by reversible
motors. Each window is controlled by a switch that is normally closed to ground.
When any switch is moved to the up position, battery voltage is applied to
the window motor through the Power Window Motor Left Front Up circuit or through
the Power Window Motor Right Front Up circuit. The motor is grounded through
the Power Window Motor Left Front Down circuit or through the Power Window
Motor Right Front Down circuit. When any switch is moved to the down position,
the voltage polarity at the window motor is reversed. Battery voltage is
applied to the motor through the Power Window Motor Left Front Down circuit
or through the Power Window Motor Right Front Down circuit. The motor is grounded
through the Power Window Motor Left Front Up circuit or through the Power
Window Motor Right Front Up circuit.
Each window motor contains an internal electronic circuit breaker. If
a window switch is held in the up or down position after the window is fully
opened or closed, the circuit breaker opens to stop the motor. The circuit
breaker also opens to stop the window when the window becomes obstructed
during operation. The circuit breaker resets when the voltage
to the motor is interrupted.
Express Down Feature
The power window system also includes an express down feature. This
feature allows the driver window to open completely when the driver window
switch is momentarily held in the down position. All of the solid state circuitry
for the express down feature is contained in the power window control module.
