Circuit/System Description
WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
When a seat lumbar or bolster function is commanded ON, the seat bolster memory control module applies battery voltage through the seat lumbar/bolster pump control circuit to the pump. The pump runs inflating the appropriate air lumbar or bolster bladders until the switch is released.