Glass, Frames and Mechanisms - System Operation and Component Description

The FCIM deactivates the rear window defrost relay when one of these conditions is met:

The rear window defrost switch is pressed when the feature is active. If equipped, the rear window defrost is commanded off using voice command or the touchscreen interface when the feature is active. Ignition state is changed from ON to OFF. A predetermined timer completes. Battery voltage has dropped below a specified threshold (load management strategy).

Remote Start - Rear Window Defrost Operation

The customer can select different climate control modes/preferences when the vehicle is started using the remote start feature. This can be accessed through the message center. For additional information on setting the remote start preferences, refer to the Owner's Literature. When the rear defrost is set to AUTO mode, the rear window defrost activates when the outside temperature is less than 0°C (32°F) and the vehicle is started using the remote start feature. No climate control adjustments are recognized during remote start operation. Once the ignition is cycled to the ON mode, the climate control system returns to the previous settings (last ignition ON cycle) and adjustments can be made normally. If the previous setting was off, the climate control system turns off.

Component Description

Window Control Switches - Without Memory Driver Seat

The master window control switch (and passenger 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 activated 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 activated too quickly to the second detent position (less than 5 milliseconds of time between first detent signal and second detent signal), the window motor is not able to determine the intended direction request and does not operate until the window control switch is released and activated 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.

For convertible, the master window control switch also operates the rear quarter windows. When the switch is activated, a 12-volt signal is sent to both rear quarter window motors to request an up or down operation.

Master Window Control Switch - With Memory Driver Seat

The master window control switch receives voltage whenever the delayed accessory relay is active. The master window control switch is grounded through the DDM. The master window control switch communicates to the DDM through a LIN.

Passenger Window Control Switch - With Memory Driver Seat

The PDM provides a return (ground) for the passenger door window control switch. The passenger window control switch sends 2 separate signals to the PDM: up and down. When the window control switch is pressed to the first detent position, a ground signal is sent to the PDM to request an up or down operation. When auto up or auto down is requested (switch activated to the second detent position), the window control switch provides a ground signal on both the up and down line simultaneously. During an auto up or auto down request, the PDM determines intended window direction by the signal first received

Door Window Regulator Motor

The door window regulator motor(s) are bi-directional. Window direction is determined by the low current voltage signal(s) being supplied to the motor from the window control switch or associated door module (if equipped with memory driver seat). The door window regulator motor contains integral electronics which control the one-touch up/down movements as well as the short drop window feature.

Rear Quarter Window Regulator Motor

The rear quarter window regulator motor(s) are bi-directional. Window direction is determined by the low current voltage signal(s) being supplied to the motor from the master window control switch or a command over the global open circuit.