Windows: Description and Operation

CAUTION: Disconnect the window switch connector before you start. You could unintentionally switch the window to "automatic down" while working In the driver's door with the power on. The moving glass could injure your arms, hands, or fingers.

System Description
The operation of the power windows is controlled by the main switch in the master power window switch. When the main switch is in OFF, only the driver's door window can be opened or closed. With the main switch ON, the passenger's window can be opened or closed by its master switch in the driver's door or by its own switch in the passengers door. The driver's window switch has an automatic down mode which is turned on when you momentarily hold the driver's window switch in the DOWN position.

The power windows are driven by reversible motors. Each motor is protected by a built-in circuit breaker. If the window switch is held on too long (with the window obstructed, or after the window is fully up or down) the circuit breaker opens the circuit. The circuit breaker resets automatically as it cools.

When the ignition switch is in ON (II) (and for 10 minutes after it is switched to LOCK (0) and as long as both doors remain closed), the driver's multiplex control unit provides voltage to the coil of the power window relay. The contacts of the power window relay close and voltage is applied to the master power window switch and the passenger's power window switch.

Driver's Window
The driver's power window master switch is part of the door multiplex control unit. When you hold the driver's window switch in the UP or DOWN position, the door multiplex control unit applies power to the driver's window motor in the direction requested.

Auto Down
The driver's window is equipped with an AUTO DOWN feature. When you momentarily hold the driver's window switch in the DOWN position, the door multiplex control unit applies power to the driver's window motor. As the window moves down, the pulser in the driver's window motor sends a pulsing ground signal to the door multiplex control unit. When the window reaches the fully down position. the pulsing signal stops and the door multiplex control unit removes power from the motor.

Passenger Window
Once you turn on the main switch in the master panel, the passenger window can be operated from the passenger's door switch or from the master panel.

When you open or close the passenger's window from the master power window switch, the door multiplex control unit sends a signal to the driver's multiplex control unit through the BRN wire. The driver's multiplex control unit sends this request to the passenger's multiplex control unit and turns on the window motor by supplying voltage to the motor in the proper direction.

When you move the passenger's power window switch to UP, voltage is applied to the passenger's power window motor. The motor is grounded through the contacts in the passenger's power window switch and the passenger multiplex control unit. The window then moves up as long as you hold the switch in the UP position. If you move the passenger's door window switch to DOWN, voltage is applied in the opposite direction, and the window moves down as long as you hold the switch in the DOWN position.