Windows: Description and Operation

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 OFF, only the driver's window can be opened or closed. With the main switch ON, all windows can be opened or closed by either the master power window switch or each window's respective switch. The master window switch also has an automatic DOWN mode built into the master power window switch.


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 RUN, voltage is applied to the coil in the power window relay. The contacts of the power window relay close and voltage is applied to the master power window switch and all the individual window switches.


Driver's Window


When you move the driver's power window switch UP voltage is applied to the power window motor. The motor's ground path is back through the driver's power window switch. The power window motor drives the window up. When you move the driver's power window switch DOWN, voltage is applied in the opposite direction and the motor drives the window down.


Automatic Down (Driver's Window)


When you push the driver's switch to the AUTO DOWN position, voltage is applied through the master switch to the power window motor. The control unit receives voltage pulses at the pulser input while the motor is operating. When the window is fully down, the motor stops, and pulses are no longer generated by the pulser. This is sensed by the control unit at the pulser input and voltage is no longer applied to the power window motor.


Passenger Windows


With the ignition switch in RUN, voltage is applied to the coil of the power window relay. The contacts of the power window relay close and voltage is applied through the under-dash fuse/relay box to the individual window switches and the master power window switch. If you turn on the main switch in the master switch, the passenger windows can be operated from the individual window switches or from the master power window switch.


When you move the right front window switch to UP voltage is applied to the right front power window motor. The motor is grounded through the contacts in the right front power window motor switch and the master power window switch. The window moves up as long as the switch is held in the UP position. If you move the switch to DOWN, voltage is applied in the opposite direction. The window moves down as long as the switch is held in the DOWN position. The other passenger windows operate similarly from their individual window switches.


When the master switch (right front switch) is moved to UP voltage is applied through the right front window switch contacts to the right front power window motor. The motor is grounded through the contacts in the right front power window switch and the master power window switch. The window moves up as long as the switch is held in the UP position. If the master switch (right front switch) is moved to DOWN, voltage is applied in the opposite direction. The window moves down as long as the switch is held in the DOWN position. The other passenger windows operate similarly.