Windows: Description and Operation

WARNING

You could injure your arms, hands, or fingers if you unintentionally switch the driver's window to "automatic down" while working in that door with the power on. Disconnect the window switch connector or the battery when working in the driver's door.


System Description


The operation of the power windows is controlled by the main switch in the master switch panel. When the main switch is OFF, only the driver's door window can be opened or closed. With the main switch ON, all windows can be opened or closed from either the master switch panel or each door's window switch. The driver's window switch has an "automatic down" mode which is turned on by pushing the switch down to its second 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 run, and for 10 minutes after it is switched to off with the front doors closed, the integrated control unit provides voltage to the coil in the power window relay. The contacts of the power window relay close, applying voltage to the master power window switch and all the individual window switches.


Driver's Window


With the ignition switch in run, and for 10 minutes after it is switched off, the integrated control unit provides voltage to the coil of the power window relay. The contacts of the power window relay close, applying voltage to the master power window switch. When you move the driver's switch to UP, voltage is applied to the power window motor. The motor's ground path is back through the driver's switch. The power window motor drives the window up as long as you hold the switch in the UP position. When you move the driver's switch to DOWN, voltage is applied in the opposite direction, and the motor drives the window down as long as you hold the switch in the DOWN position.


Automatic Down (Driver's window)


With the ignition switch in RUN or START, voltage is applied to the coil of the power window relay through the integrated control unit. The contacts of the power window relay close, applying voltage to the master power window switch. When you push the driver's switch to the AUTO DOWN position, voltage is applied through the driver's switch to the power window motor. The control unit receives 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 its pulser input, and voltage is no longer applied to the power window motor.


Passenger Windows


With the ignition switch in RUN, and for 10 minutes after it is switched off, voltage is applied to the coil of the power window relay by the integrated control unit. The contacts of the power window relay close, and voltage is applied to the individual window switches and the master power window switch. If you turn on the main switch in the master panel, the passenger windows can be operated from the individual window switches or from the master panel switches.


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 switch and the master power window switch. The window moves up as long as you hold the switch in the UP position. If the right front power window switch is moved to DOWN, voltage is applied in the opposite direction to the right front power window motor and the window moves down as long as you hold the switch in the DOWN position. The other passenger door window switches work the same way.


When you move the right front switch in the master panel 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 panel switch. The window moves up as long as the switch is held in the UP position. If the right front switch in the master panel is moved to DOWN, voltage is applied in the opposite direction to the right front power window motor. The window moves down as long as the switch is held in the DOWN position. The other passenger window switches in the master panel work the same way.