Power and Ground of the Inside Rearview Mirror

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

With the ignition ON, ignition voltage is supplied to the mirror from the POWER SUNROOF20A fuse in the I/P fuse block.
Ground for the mirror is provided by G401.