Windows: Description and Operation

A permanent magnet motor operates each power window. Each motor raises or lowers the glass when voltage is supplied to it. The direction the motor turns depends on the polarity of the supply voltage.

The power window master switch assembly controls all of the motors and the express down window module. Each window switch controls only one motor.

Power Window Master Switch Assembly Operation
With the ignition switch in ACCY, RUN, OR DURING RETAINED ACCESSORY POWER (Refer to Retained Accessory Power), battery voltage is applied to the PWR WDO/SUNROOF relay coil in the RH I/P Power Distribution Center. The relay is permanently grounded on the coil side. The coil is energized, the switch closes, and battery voltage is then applied to Power Window Master Switch Assembly. Accessory Delay Module

Battery voltage is applied to the window motor when any UP switch in the power window master switch assembly not associated with express down is operated. The window motor is grounded through the DOWN contact in the power window master switch assembly. The motor runs to drive the window up. Battery voltage is applied to the window motor in the opposite direction when any DOWN switch in the power window master switch assembly is operated. The window motor is grounded through the UP contact in the power window master switch assembly. The motor runs to drive the window down.


EXPRESS DOWN Window Operation
The "Express Down" Window function is a convenience feature that allows the LH front window to be fully opened by holding the LH Front Window Switch down for more than 0.3 seconds then releasing. The window may be stopped at any position by momentarily pressing the UP or DOWN switch.

With the ignition switch is in ACCY, RUN, OR DURING RETAINED ACCESSORY POWER, the Express Down Window Module receives power at terminal A. When the LH front window switch is held down for more than 0.3 seconds and released, the timer and control unit detects this at the down input terminal, The relay control switch closes, completing the coil circuit through the LH UP switch in the Power Window Master Switch Assembly to ground. The relay contacts close and the LH front Window Motor receives battery voltage. Terminal A of the motor is grounded through The Power Window Master Switch Assembly LH UP contact. When the window is fully down, the motor stall current is detected at the current sense input of the timer and control unit. The relay control switch opens, de-energizing the coil and disconnecting power to the motor. The motor also stops 10 to 30 seconds after the DOWN switch is pushed.

If the LH Front Window switch is pushed while operating in the "Express Down" mode, the timer and control unit detects this at the input terminal and opens the relay control switch. Terminal A of the motor is also now not grounded through the power window master switch assembly. The window stops moving down. If the power input at terminal A of the express down module is lost. the power window still operates, but without the express down feature.

Window Switch Operation
With the ignition switch in ACCY, RUN, OR DURING RETAINED ACCESSORY POWER, battery voltage is applied to the window switches and the window lockout switch through PWR WDO/SUNROOF relay. When the UP switch in the window switch is operated, battery voltage is applied to the window motor. The motor is grounded through the DOWN contact in the window switch and the DOWN contact in the Power Window Master Switch Assembly. The motor runs to drive the window up. When the DOWN switch in the window switch is operated, battery voltage is applied to the window motor in the opposite direction The motor is grounded through UP contact in the window switch and the UP contact in the Power Window Master Switch Assembly. The motor runs to drive the window down.

Each motor is protected by an electronic circuit breaker. if a window switch is held too long with the window obstructed or after the window is fully up or down, the circuit breaker opens the circuit. The circuit breakers have Positive Temperature Coefficients (PTC) and reset automatically when voltage is removed from the motors.