Important: The power windows system has voltage applied by the Windows circuit breaker. The body control module  (BCM) contains the Retained Accessory Power  (RAP) subsystem. 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 for a complete understanding of RAP operation.

With the ignition switch in the RUN or ACCY position or the BCM in the RAP mode, voltage is applied to the Windows circuit breaker. Circuit 341 applies the voltage from the Windows circuit breaker to the left side window switch, right side window switch and the power window control module. The front side door window motors and the switches are grounded by circuit 750 and G200 through the left switch. The right window can be operated from the right and left switches. The left window can only be operated from the left 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 circuit 164 or circuit 666. The motor is grounded through circuit 165 or circuit 667. 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 circuit 165 or circuit 667. The motor is grounded through circuit 164 or circuit 666.

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. The feature allows the left window to open completely when the left window switch is momentarily pressed in the down position. All of the solid state circuitry for the express down feature is contained in the power window control module.