Power and Ground
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Battery positive voltage is supplied at all times to both front heated seat relays from the HTD SEAT Fuses located in the instrument panel (I/P) fuse panel. Both relays are grounded through the relay ground circuits and G301.