Sunshade Operation
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
The sunshade control module determines the sunshade motor direction based on inputs received from the sunshade switch. When the ignition switch is in the ON position, voltage is applied to the sunshade control module and motor assembly through the 40 amp SUNROOF MOD fuse. The sunshade control module controls sunshade motor direction by changing the polarity of the applied voltage. The module will close the sunshade whenever the ignition switch is turned to the OFF position.
In addition, during sunroof or vent open operation, the sunroof control module sends a message through the K-Bus circuit to the sunshade control module to open the sunshade while the glass panel is being commanded open.