Climate Control Seat Module (CCSM) Power and Ground
WARNING: This page is about a different car, the 2007 Cadillac DTS. 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 climate control seat module (CCSM) through the battery positive voltage circuit and the 30-amp HTD/COOL fuse that is located in the rear fuse block. This voltage is used by the CCSM to supply power to the thermo-electric devices (TEDs) and the blower motors. Battery positive is also supplied to the CCSM through the ignition 3 voltage circuit and the 20-amp HTD/COOL/IGN3 fuse also located in the rear fuse block. The ignition 3 voltage is used to power up the CCSM and allows the climate control seat (CCS) system to operate only with the ignition in the ON position. The CCSM is grounded through the module ground circuit and G300.