Window Switch Operation

A Permanent Magnet (PM) Motor operates each of the Power Windows. 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.

When the Ignition Switch is in "RUN," battery voltage is applied to the Window Switches through the PWR WDO Circuit Breaker and CKT 76. When the "UP" Switch in a Window Switch is operated, battery voltage is applied to one terminal of the Power Window Motor. The other terminal is grounded through the "DN" contact in the Window Switch and the "DN" contact in the Master Switch Assembly. The Power Window Motor runs to drive the window up. When the "DN" Switch in the Window Switch is operated, battery voltage is applied to the Window Motor in the opposite direction. The Power Window Motor is grounded through the "UP" contact in the Window Switch and the "UP" contact in the Master Switch Assembly. The Power Window Motor runs to drive the window down.

Each motor is protected by a built-in electronic circuit breaker PTC. If a Window Switch is held too long with the window obstructed or after the window is fully up or down, the PTC resistance increases. The resistance returns to normal after voltage is removed from the motor terminals.