Chevrolet and GMC Switches
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The heated seat switches are momentary contact switches and are inputs to the driver and passenger door lock/window switches. A ground circuit is connected to the switch assembly through the door lock/window switch, and when a heated seat switch is pressed and released a brief switch signal is supplied to the door lock/window switch. Whenever the door module receives an active heated seat switch input, the active switch signal is sent to the memory seat module as a GMLAN message. The memory seat module determines the heated seat mode based on the switch messages and sends a message to the door lock/window switch to display the heated seat indicators as necessary.