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 power window master switch. 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 by either the power window master switch or the window switches in the doors. 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.

Driver's Window
With the ignition switch ON (II), voltage is applied to the coil of the power window relay through fuse 5. The contacts of the power window relay close and voltage is applied to the driver's window switch. When you move the driver's window switch to UP, voltage is applied to the power window motor. The motor's ground path is back through the driver's window switch. The power window motor drives the window up as long as you hold the switch in the UP position. When you move the 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 ON (II), voltage is applied to the coil of the power window relay through fuse 5. The contacts of the power window relay close, applying voltage to the driver's window switch. When you push the driver's window switch to the AUTO DOWN position, voltage is applied through the driver's switch to the 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 the pulser input terminal), and voltage is no longer applied to the window motor.

Passenger Windows
With the ignition switch ON (II), voltage is applied to the coil of the power window relay through fuse 5. The contacts of the power window relay close, applying voltage to all window switches. Once you turn on the main switch in the master panel, the passenger windows can be operated from their door switches or from the master panel.
When you move the window switch in the front passenger's door to UP, voltage is applied to the front passenger's window motor. The motor is grounded through the contacts in the front passenger's window switch and the master panel switch. The window then moves up as long as you hold the switch in the UP position. If you move the front 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. The other passenger windows operate similarly.