Theory Of Operation

The Rear Sun Shade Switch is a momentary switch hard-wired to the Body Control Module (BCM). The BCM provides a reference voltage, through a pull-up resistor that is connected to battery voltage, to the Rear Sun Shade Switch through the Rear Sun Shade Switch Sense circuit. When the Rear Sun Shade Switch is pressed, the Rear Sun Shade Switch switches to ground, providing a ground signal to the BCM.

When the BCM receives a request from the Rear Sun Shade Switch, the BCM provides a voltage output to the Rear Sun Shade Module. The Rear Sun Shade Module will either control the Rear Sun Shade up or down based on the current state of the Rear Sun Shade. The Rear Sun Shade Module is also connected the Right Backup Lamp Driver circuit and lowers the Rear Sun Shade when the Backup Lamps are activated.