Heated Seat Module
WARNING: This page is about a different car, the 2002 Dodge Grand Caravan, 2002 Dodge Caravan, 2002 Chrysler Voyager, and 2002 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
Check Heated Seat Module (HSM) power and ground circuits. See WIRING DIAGRAMS . If no problem is found, replace HSM with known-good unit and recheck.