Possible Causes
WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
HEATED SEAT RELAY
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
HEATED SEAT RELAY CONTROL WIRE
BODY CONTROL MODULE
PCM NOT ACTIVE ON THE BUS