Lumbar Switch
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.
The lumbar switch provides both power and ground to the selected lumbar motors. Battery positive voltage is supplied at all times to the lumbar switch from the PWR SEAT Circuit Breaker located in the IP fuse block. Ground is supplied at all times to the lumbar switch through the switch ground circuit and G 301.