Circuit Operation

The POWER WINDOW circuit breaker CB-27 applies battery voltage at all times to the power window relay contacts. With the starter switch in ON, the BACK UP/TURN LIGHT fuse CB-1 5 applies battery voltage to the power window relay coil. The relay energizes and allows battery voltage from the circuit breaker to both of the door power window switches.

Left Front Window
When the left front door power window switch is moved to UP or DOWN, a signal is sent to the control unit (built-into the switch). The control unit provides power to the left front power window, driving the window in the direction selected. The control unit removes power to the motor when the switch is released or when the window reaches its fully open or closed position.

Auto Down
When the left front door power window switch is moved to AUTO, a signal is sent to the control unit (built-into the switch). The control unit provides power to the left front power window motor, driving the window down. The control unit removes power to the motor when the window reaches the fully open position.

Passenger Windows
The passenger windows can be operated from the left front door power window switch or the respective door power window switch. The passenger door power window switch can only be operated when the lock switch in the left front door power window switch is in the OFF position.
When the passenger power window switch is moved to UP or DOWN, a signal is sent to the control unit (built-into the switch). The control unit then provides power to the window motor, moving the window in the direction selected. The control unit removes power to the motor when the switch is released or when the window reaches its fully open or closed position.
When the passenger window is being controlled by the switch in the left front door, the control unit in the left front door switch sends a multi-plexed signal to the control unit in the other power window switch. The signal tells the appropriate control unit to provide power to its power window motor, moving the window in the direction selected. The control unit removes power to the motor when the switch is released or the window reaches its fully open or closed position.