Principles of Operation (How Does It Work?)

Power Window Control
The driver power window one-touch down operation is controlled by the window/lock switch with integrated electronics. The one-touch down operation is requested by momentarily pressing the driver window down switch for 32 ms to 480 ms. The initial voltage input from the down switch starts the one-touch down operation. If the voltage input was less than 480 ms, the window/lock switch will maintain the voltage supply to the window regulator motor down circuit. Central Junction Box (CJB) maxi-fuse 28 (20A) supplies the power to the switch for this operation. The switch will maintain the operation until:
^ seven seconds expire.
^ the switch detects the motor stalled by monitoring the current draw.
^ a voltage input is received by the switch on either the up or down switch circuits.

From the switch, there is only one ground that is used for normal window operation and for one-touch down operation, making diagnostics simpler. If this ground is open, all window operation (one-touch and normal) will be inoperative. The switch monitors voltage on the down circuit for the driver window. If the switch continues to detect voltage on the down circuit for more than 480 ms after initial activation, the switch will not affect operation. The down circuit through the switch is a direct connection to the motor in its normal state. This allows the driver window switch to control the motor for normal operation.

The passenger window motors are hardwired directly to the window regulator control switches.

Heated Rear Window
The heated rear window is controlled by the Lighting Control Module (LCM). The ignition switch must be in RUN for the heated rear window to operate. Pressing the heated rear window switch grounds the input to the LCM. The LCM detects the line at ground and checks the ignition switch position. If the module detects the ignition switch in RUN, ground is supplied to the heated rear window relay output. The heated rear window relay coil is energized which closes the contacts and supplies power to the hidden antenna module, the ON indicator in the heated rear window switch and if equipped, the exterior mirrors.

The hidden antenna module then supplies power and ground to the heated rear window grid.