Principles of Operation

Glass, Frames and Mechanisms

Principles of Operation

Front Power Window Control - One-Touch Up/Down

NOTE: All vehicles are equipped with one-touch up/down feature on the LH front window. All MKZ and some Fusion vehicles are equipped with one-touch up/down feature for both LH and RH front windows. LH and RH one-touch up/down functionality is identical.

NOTE: The front window motor must be de-initialized, then initialized whenever:
- the front window motor is removed from the window regulator drum housing.
- a new window regulator is installed.
- a new window glass is installed.
- a new top run is installed.
- grease or lubricants are applied to the window regulator or glass run.

Each door window motor is a 6-pin motor with integral electronics and must be initialized whenever a new window motor has been installed. Initialization is required to learn the full UP position and the profile of the glass as it travels through the glass channel. Once initialized, obstacle detection is enabled. When mechanical repairs have been carried out on the window regulator or glass run, the window motor must be de-initialized, and then initialized. The window control switch sends 2 separate signals to the window motor: up and down. When the window control switch is pressed to the first detent position, a 12-volt signal is sent to the window motor to request an up or down operation. When auto up or auto down is requested (switch pressed to the second detent position), the window control switch provides a 12-volt signal on both the up and down line simultaneously. During an auto up or auto down request, the window motor determines intended window direction by the signal first received. If the window control switch is pressed too quickly to the second detent position (less than 5 milliseconds of time between first detent signal and second detent signal), the window motor will not be able to determine the intended direction request and will not operate until the window control switch is released and pressed again. The up and down contacts are floating within the window control switch when the switch is in the neutral position. The up and down feeds to the window motor are all low current.

When the window motor is operating in auto up or auto down mode, movement of the window can be stopped by pressing the switch to any position (up, down, auto up, auto down). The window control switch must be released before the window will move again.

If there is an open in the window control switch or the associated wiring, the related function will become inoperative. If the up contact of the switch or the associated wiring develops an open circuit, the window will only operate in the down direction. If the down contact of the switch or the associated wiring develops an open circuit, the window will only operate in the up direction.

A new window motor will not operate in one-touch up mode, and the bounce-back feature will be disabled prior to initialization. If the switch is actuated to the AUTO UP or AUTO DOWN position and released, window movement will stop when the up or down contact in the window control switch is released. If the window motor is removed from the window regulator drum housing, or if a new window motor is installed, it must be initialized. Refer to Window Motor Initialization .

The window motor will automatically adjust to system changes throughout its life: changes in seal drag and slight changes in the full OPEN position will occur and will be automatically compensated for. Once initialized, the window motor will soft stall into the upper and lower positions contributing to extended durability of the system. If the window does not seal completely in the full UP position (very small gaps/non bounce-back events only), the window switch can be actuated to the UP position and the window will be energized for a fraction of a second to fully seal and this new position will be learned.

Passenger windows may be raised or lowered using the LH front window control switch or the corresponding passenger window control switch. Rear passenger window control switches receive power when the accessory delay relay is active and the LH front window lock switch is in the UNLOCK position. When the LH front window lock switch is in the LOCK position, the rear passenger windows will not operate.

Bounce-Back

The window motor has a bounce-back feature. If an obstacle has been detected in the window opening as the window glass is moving upward, the window motor will automatically reverse direction and move the glass toward the bounce-back position (in both up and one-touch up modes). If an obstruction occurs between 4 mm (0.15 in) and 200 mm (7.87 in) of window opening, the bounce-back position will be 250 mm (9.84 in) of window opening. If an obstruction occurs at a position greater than 200 mm (7.87 in) of window opening, the bounce-back position will be 50 mm (1.96 in) below where the obstruction occurred.

Security Override

To override a bounce-back condition (to overcome the resistance of ice on the window or seals for example), within 2 seconds after the window reaches the bounce-back position, pull and hold the window control switch. The window will travel up with no bounce-back or pinch protection. If the window control switch is released before the window is fully closed, the window will stop. If the ignition switch is turned to OFF or START (without delayed accessory power), the window motor will stop.

Global Open (if equipped)

NOTE: The global open feature may be enabled/disabled via scan tool or in some cases modified by the customer following a procedure listed in the vehicle Owner's Literature. For a complete list of available programmable parameters, refer to the Module Configuration and Parameter Chart in Information Bus. Module Configuration

NOTE: The Smart Junction Box (SJB) may also be identified as the Generic Electronic Module (GEM).

If equipped, when the unlock button of the Remote Keyless Entry (RKE) transmitter is held for 2 seconds, the global open feature activates. The SJB (Smart Junction Box) sends a signal to activate the one-touch down operation of both front windows. The global open feature does not operate if the delay accessory is active.

Delayed Accessory Power

The SJB (Smart Junction Box) activates the accessory delay relay whenever the ignition switch is in the RUN or the ACC position, or when the ignition switch is changed from RUN or ACC to the off/lock position and the LH and RH front doors are closed. When energized, the accessory delay relay supplies voltage to the power window system.

The SJB (Smart Junction Box) will deactivate the delayed accessory feature when:

- the LF door is ajar and the ignition switch is in the off/lock or key-out position.

- the RF door is ajar and the ignition switch is in the off/lock or key-out position.

- ten minutes have elapsed since the ignition switch was changed from ACC or RUN to the off/lock position.

Rear Window Defrost

For MKZ the rear window defrost switch is integral to the Front Controls Interface Module (FCIM). For Fusion, the rear window defrost switch is integral to the HVAC module or the FCIM (Front Controls Interface Module) if equipped with navigation system. When the rear window defrost switch is pressed, the HVAC module will activate the rear window defrost relay located in the Battery Junction Box (BJB). When the rear window defrost relay is active, the rear window defrost grid will be energized.

The HVAC module will deactivate the rear window defrost relay when one of the following conditions is met:

- The rear window defrost switch is pressed when the feature is active

- Ignition switch state is changed from RUN to OFF/LOCK

- The 10-minute timer completes