Windows: Description and 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.

The Console Window Switch controls all of the Power Window Motors and the Power Window Control Module. Each Window Switch controls only one of the Power Window Motors.


CONSOLE WINDOW SWITCH OPERATION

When the Ignition Switch is in RUN, battery voltage is applied to the Console Window Switch through the WDO Circuit Breaker and the PNK (76) wire.

When any of the UP switches in the Console Window Switch not associated with Express Down are operated, battery voltage is applied to the Power Window Motor. The Power Window Motor is grounded through the DN contact in the Console Window Switch. The Power Window Motor runs to drive the window up. When any of the DN Switches in the Console Window Switch are operated, battery voltage is applied to the Power Window Motor in the opposite direction. The Power Window Motor is grounded through the UP contact in the Console Window Switch. The Power Window 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 DN for more than 0.3 seconds then releasing it. If the LH Front Window Switch is held DN for less than 0.3 seconds, the window will only move down a small distance.

When the Ignition Switch is in RUN, the Power Window Control Module receives power at terminal A. When the LH Front Switch is held DN 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 Front UP Switch in the Console Window Switch to ground G321. The relay contacts close and the LH Front Power Window Motor receives battery voltage. The other terminal of the motor is grounded through the Console Window Switch LH Front UP contact. When the window is fully down, the motor stall current will be detected at the current sense input of the Timer and Control Unit. The Relay Control Switch will be opened, de-energizing the coil and disconnecting power to the motor. The motor will also be stopped 20 +/- 10 seconds after the LH Front DN Switch is pushed.

If the LH Front UP or DN Switch is pushed while operating in the Express Down mode, the Timer and Control Unit will detect this at the UP input terminal and open the Relay Control Switch. The DK BLU wire at the other LH front power window terminal is now not grounded through the Console Window Switch. The window will stop moving down and will move up if the LH Front UP Switch is held. If the power input at terminal A of the Power Window Control Module is lost, the power window will still operate but without the Express Down feature.


WINDOW SWITCH OPERATION

When the Ignition Switch is in RUN, battery voltage is applied to the Window Switches through the WDO Circuit Breaker and the PNK (76) wires. 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 Console Window Switch. 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 Console Window Switch. 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.