Principles Of Operation

Glass, Frames and Mechanisms

Principles of Operation

LH Front Window Operation

NOTE: The master window control switch and the LH front window motor each contains integral electronics which must be initialized whenever:
- a new window control switch is installed.
- a new window regulator and motor is installed.
- a new window glass is installed.
- a glass top run removal and installation.
- carrying out any operation in which grease or lubricants are applied to the window system.
- battery voltage has been removed from the LH front window control switch for more than 3 minutes (for example, battery or window control switch disconnected).
For additional information, refer to Window Motor Initialization Programming and Relearning.

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 LH front window 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.

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 is sent to the Body Control Module (BCM). When the BCM (Body Control Module) receives the defrost request signal, 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 (Body Control Module) 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