Windows: Description and Operation

CAUTION:
^ Before performing any diagnostics, make sure the lock out switch is in the OFF position.
^ Each window regulator motor contains an electronic circuit breaker. The resistance in the window regulator motor increases if the motor is overloaded and the resistance will return to normal after voltage is removed from the motor terminals.
^ A momentary actuation of the window switch can cause the window to move directly to the fully open position. When working on the door leave the ignition off whenever possible. Note where the window switch is so you do not accidentally hit it. To stop the window, press the LF window switch UP.

A Permanent Magnet (PM) motor operates each of the power windows. Each motor raises or lowers the glass when voltage is supplied to it. The direction the motor turns depends on the polarity of the supply voltage. The window switches control the supply voltage polarity.

Each motor is protected by a built-in circuit breaker. If a window switch is held 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 only after voltage is removed from the motor.

LF Window Switch Operation
When the ignition switch is in the RUN or ACCY position. battery voltage is applied to the LF window switch through the PWR WINDOWS PWR SUNROOF Circuit Breaker and to circuit 143. When any of the up switches in the LF window switch are operated, battery voltage is applied to the window regulator motor. The window regulator motor is grounded through the down contact in the LF window switch. The motor runs to drive the window up When any of the down switches in the LF window switch are operated battery voltage is applied to the window regulator motor in the opposite direction. The window regulator motor is grounded through the up contact in the LF window switch. The motor runs to drive the window down.

Express Down Feature
If the DN position in the LF window switch is momentarily pressed down past the first defeat, the window will travel to the fully down position. To stop the window, press the LF window switch to the UP position.

Lock Out Switch Operation
The LF window switch contains a lock out switch which will remove battery voltage from the other window switches. This will not allow the operation of the windows from their individual switches. The windows can still be operated as normal from the LF window switch.

Window Switch Operation
When the ignition switch is in the RUN or ACCY position, battery voltage is applied to the window switches through the PWR WINDOWS PWR SUNROOF Circuit Breaker, to circuit 143, and then through the LF window switch to circuit 1307. Then to all the switches. When the UP position in the RF window switch is pressed, battery voltage is applied to the RF window regulator motor through circuit 666. The motor is grounded through circuit 667, the down contact in the RF window switch, circuit 167, and the down contact in the LF window switch. The motor runs to drive the window up. When the DN position in the RF window switch is pressed, battery voltage is applied to the RF window regulator motor in the opposite direction through circuit 667. The motor is grounded through circuit 666, the up contact in the RF window switch, circuit 166, and the up contact in the LF window switch. The motor runs to drive the window down. The other windows operate similarly from their individual window switches.