501-11 Glass, Frames and Mechanisms	2014 Fiesta
Description and Operation	Procedure revision date: 05/7/2013

Glass, Frames and Mechanisms - Vehicles With: One-Touch Up and Down Driver Window - System Operation and Component Description

System Operation

System Diagram - Rear Window Defrost (with EATC )

Network Message Chart - Rear Window Defrost (with EATC )

BCM Network Input Messages

Broadcast Message	Originating Module	Message Purpose
Defrost Mode	HVAC - EATC	When the rear window defrost button is pressed, this message is used by the BCM to supply voltage to the rear window defrost grid.

Power Window Operation

The power windows operate when the accessory relay is active. The accessory relay is located in the CJB and is activated by the BCM whenever the ignition is on.

Driver Door Window Operation

The master window control switch contains electronics that control the one-touch up/down operation. The master window control switch receives feedback from the Hall-effect sensors which are integral to the driver front window regulator motor. If the Hall-effect sensors or any associated circuitry fails, the window still operates but the one-touch up/down and obstacle detection is inoperative.

If an obstacle has been detected in the window opening as the window glass is moving upward, the window motor automatically reverses direction and moves the glass toward the bounce-back position.

To override a bounce-back condition (for example, to overcome the resistance of ice on the window or seals), close the window glass twice until it reaches the resistance and allow it to reverse to the bounce-back position. On the third attempt, activate and hold the master window control switch in the UP position. The window travels up with no bounce-back protection

Passenger Door Window Operation

The window control switch can be used to manually raise or lower all windows from the master window control switch or the individual side window from the corresponding individual door switch.

Rear Passenger Windows Lock-Out

When the lock-out switch (part of the master window control switch) is in the LOCK position, the rear door passenger power windows can only be operated from the master window control switch.

Rear Window Defrost

The engine must be running for the rear window defrost system to operate. When the rear window defrost switch (integral to the HVAC module) is pressed, a ground signal (if equipped with EMTC ) or message (if equipped with EATC ) is sent to the BCM . When the BCM receives the defrost request, it supplies voltage to the rear window defrost grid. The rear defrost self actuates when the ambient air temperature is less than 5° C (41° F) and engine coolant temperature is less than 60° C (140° F). The rear window defroster LED indicator does not illuminate when the rear defroster self actuates.

The BCM deactivates the rear window defrost grid when one of the following conditions is met:

The rear window defrost switch is pressed when the feature is active
The ignition state is changed from ON to OFF/LOCK
The 14-minute timing function is complete

Component Description

Master Window Control Switch

The master window control switch and the driver front window motor each contain integral electronics which must be initialized whenever:

a new master window control switch is installed.
a new driver front window regulator and motor is installed.
a new driver front window glass is installed.
carrying out any operation in which grease or lubricants are applied to the driver door window system.
battery voltage has been removed from the master window control switch for more than 3 minutes (for example, battery or window control switch disconnected).

Refer to: Power Door Window Initialization - Vehicles With: One-Touch Up and Down Driver Window/One-Touch Up and Down Front Windows (501-11 Glass, Frames and Mechanisms, General Procedures).

The master window control switch:

contains integral electronics to control the one-touch up/down operation of the driver front power window.
supplies high current voltage and ground directly to the driver front power window motor to move the window upward and downward.
supplies high current ground circuit for all passenger window operation.
supplies high current voltage to the rear power windows when the lock-out switch is in the UNLOCK position.

Passenger Front Door Window Control Switch

The passenger front window control switch is supplied voltage whenever the accessory relay is active. The passenger front window control switch contacts are normally closed. When the passenger front window control switch is activated, voltage and ground are supplied to operate the power window motor in the desired direction.

Rear Door Window Control Switch

The rear window control switches receive voltage whenever the lock-out switch (part of the master window control switch) is in the UNLOCK position. Ground is provided to the rear window control switches through the master window control switch. The rear window control switch contacts are normally closed. When the rear window control switch is activated, voltage and ground are supplied to operate the power window motor in the desired direction.

Driver Window Regulator Motor

The driver window regulator motor contains 2 Hall-effect sensors which provide feedback to the master window control switch. The driver window regulator motor is bi-directional. Window direction is determined by the polarity of the voltage and ground being supplied to the motor from the master window control switch.

Passenger Window Regulator Motor

The window regulator motors are all bi-directional. Window direction is determined by the polarity of the voltage and ground being supplied to the motor from the window control switch.

HVAC Module

The HVAC module contains the rear window defrost switch.

BCM

The BCM module controls the accessory relay which supplies voltage to operate the power window system. The BCM also supplies the high current voltage to operate the rear window defrost grid.