Climate Control Seat Module
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The Climate Control Seat Module (CCSM) is located under the passenger seat and controls 4 individual driver and passenger seat heat/cool ventilation blowers. When the CCSM receives a heated cooled seat command through the left or right heated/cooled seat mode signal circuit, the appropriate seat heat/cool ventilation blowers will be operated by the CCSM.