Lumbar Switch
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
The seat lumbar switch controls the lumbar horizontal and vertical motors located in the seat back through relays that are located under the seat cushion. Battery positive voltage is supplied at all times to the seat lumbar switch from the H SEAT LUM Fuse located in the IP fuse block.