When the ignition switch is in the RUN position, the battery voltage is applied to the master window switch through circuit 141. The switch assembly is grounded through circuit 150. When you operate any master window UP switch that is not associated with express down, the battery voltage is applied to the window motor. The motor grounds through the Down contact in the master window switch. The motor drives the window up.

When you press Down past the first detent on any master window Down switch, the battery voltage is applied to the window motor in the opposite direction. The motor grounds through the UP contact in the master window switch. The motor drives the window down.

When you press the left front window switch to the first detent in the DOWN position, the following actions occur:

1. The express circuit within the master window switch engages.
2. The express circuit applies voltage to circuit 165.
3. The left front window moves to the fully open position.

When the left front window reaches the mechanical limit, the current drawn to the motor increases significantly. The express down circuits in the master window switch perform the following functions:

1. The circuits sense this current draw.
2. The circuits remove power to the power window.

The rear window switches are tied in a series circuit to the master window switch. At rest, each switch contact is tied to ground through the master window switch. When the master window switch operates a rear window, battery voltage is applied to one side of the associated rear window motor. The motor drives the window in the corresponding direction.

When you operate a rear window switch, battery voltage is applied to the rear power window motor through CKT 1307. The motor drives the window in the corresponding direction.

Each motor is protected by a built-in electronic circuit breaker PTC. The PTC resistance increases under the following conditions:

The resistance returns to normal after the voltage is removed from the motor terminals.