Power Seat and Lumbar Switches
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Battery positive voltage is supplied at all times to the seat adjuster switch and the lumbar switch from the MSM and a 10 A fuse located in the I/P fuse block. When the seat or lumbar switches are pressed they send a 12 V signal to the MSM. The MSM then commands the selected seat motor to move in response to the switch input.