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<\/a><\/p>\nFig. 10<\/strong><\/p>\n <\/p>\n The earlier systems in the series are the Keyless Entry System<\/strong><\/a>, Content Theft Deterrent<\/a>,<\/strong> Door Latch Actuators<\/a>,<\/strong> Tire Pressure Monitoring Systems<\/strong><\/a>, and Exterior and Interior Lighting<\/strong><\/a>.<\/p>\n COMPONENT BREAKDOWN<\/strong><\/p>\n MOVEABLE WINDOWS SYSTEM OVERVIEW<\/strong><\/p>\n Moveable windows allow occupants to open and close the glass. Fixed windows\u2014such as the windshield, rear window, and fixed side or quarter glass\u2014remain stationary.<\/p>\n Moveable-window systems include door-mounted side windows that use physical switches to open and close the windows. (Fig. 11) In some configurations, the window switches communicate with the BCM. The BCM evaluates the request, checks for conditions that may inhibit window movement, and communicates with the applicable window motor.<\/p>\n Fig. 11<\/strong><\/p>\n <\/p>\n In other configurations, the rear window switch up\/down control circuits are directly connected to the rear window regulator motor, allowing the local switch to command window movement. A separate LIN communication circuit may still connect the rear window switch to the BCM. This LIN circuit allows the BCM to monitor switch status, coordinate commands from the driver\/master switch, support the window-lockout feature, and communicate commands back to the rear window switch. For example, when the window lockout feature is enabled, the BCM can send a disable command to the rear window switches.<\/p>\n TIP:<\/strong> Exact circuit operation varies by vehicle configuration. Refer to the applicable schematic and Power Windows Description and Operation document for the vehicle being serviced.<\/p>\n Express Functions<\/strong><\/p>\n For vehicles equipped with express-down windows or express-up-and-down windows, the driver and passenger doors contain smart window motors. These motors are designed to detect excessive resistance while performing the express-up function and will automatically reverse direction to help reduce the risk of a pinching injury to any occupants between the closing window and the door frame. Note that the automatic-reversal feature can be overridden by pulling and holding the appropriate window control switch.<\/p>\n Window Lockout<\/strong><\/p>\n On vehicles equipped with power actuated rear side windows, independent control of the rear windows can be disabled. Refer to the Power Windows Description and Operation document in the appropriate Service Information for switch location, which can vary from vehicle to vehicle. This function is often referred to as the window lockout switch. When window lockout is enabled, the rear windows cannot be operated from their respective switches but can still be controlled from the driver side-door window control switch.<\/p>\n FIXED WINDOWS SYSTEM OVERVIEW<\/strong><\/p>\n Fixed windows, or stationary glass panels, include the windshield, rear window, and fixed side or quarter windows. (Fig. 12) These windows do not open or close and are typically attached to the vehicle body with adhesive.<\/p>\n Fig. 12<\/strong><\/p>\n <\/p>\n Rear Window Defogger<\/strong><\/p>\n Where equipped, the rear window defogger can be turned on with a physical switch or through a user-interface control, including the infotainment display on some vehicles. The switch or display sends a serial-data request to the BCM. The BCM then energizes the rear window defogger relay, which closes its contacts and allows battery-positive voltage to flow through the rear window defogger grid.<\/p>\n Glass Breakage Sensors<\/strong><\/p>\n On select vehicles, the rear window defogger grid also serves as an input to the BCM for the theft-deterrent system through the glass-breakage sensors. (Fig. 13) When the theft-deterrent system is armed and the completed circuit through the rear window defogger experiences an open-circuit condition, such as due to a broken rear window, the BCM detects that an unwanted glass-breakage event has occurred.<\/p>\n Fig. 13<\/strong><\/p>\n <\/p>\n Select vehicles also may have fixed side windows that are equipped with breakage sensors (Fig. 14), such as 2026 Escalade and Escalade ESV.<\/p>\n Fig. 14<\/strong><\/p>\n <\/p>\n Heated Windshield<\/strong><\/p>\n Some models also feature an optional heated-windshield system, sometimes called a heated wiper de-ice system or windshield defogger. (Fig. 15) This system uses a different control path where the heating and air-conditioning (HVAC) user interface sends a serial-data request to the Lighting Control Module, which controls the applicable windshield-heater relay or system output.<\/p>\n Fig. 15<\/strong><\/p>\n <\/p>\n The operating conditions for the rear window defogger and heated windshield or heated wiper de-ice system can vary by vehicle. Some configurations require the vehicle to be in propulsion-active or engine-running mode before the feature can be turned on. Refer to the vehicle owner\u2019s manual, schematic, and Description and Operation document in Service Information for the exact operating conditions.<\/p>\n MOVEABLE WINDOW SYSTEM TOPOGRAPHY<\/strong><\/p>\n The following graphic illustrates a representative communication structure for a moveable-window system. (F16) Exact network and circuit configurations vary by model.<\/p>\n\n
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