Windows: Description and Operation

GLASS, FRAMES AND MECHANISMS

The glass, frames and mechanisms consist of the following components:
- window control switches
- windshield glass
- window regulator motors
- window regulators
- door window glass
- door glass top runs
- rear quarter window glass and glass top run assembly
- rear window glass
- rear window defrost switch
- rear window defrost relay
- antenna module

PRINCIPLES OF OPERATION

Power Window Control
The driver power window one-touch down operation is controlled by a 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. The battery junction box (BJB) maxi-fuse 107 (40A) supplies the power to the switch through the accessory delay relay 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 one-touch down electronics has been incorporated into the master switch. 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 control switches.

Heated Rear Window
The heated rear window is controlled by the dual automatic temperature control (DATC). 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 DATC. 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 antenna module. The antenna module then supplies power and ground to the heated rear window.