Electrically Heated Systems

HEATED SEAT RELAY
The Heated Seat System supply voltage is controlled through the Heated Seat Relay located in the Power Distribution Center (PDC). The relay coil is controlled by the Body Control Module (BCM) and is energized whenever the ignition key is in the on position. If low battery voltage is sensed by the Powertrain Control Module, a PCI bus message will be sent to the BCM to turn off the Heated Seat Relay.

REAR WINDOW DEFOGGER
The Body Control Module (BCM) controls the operation of the Rear Defogger Relay located in the Junction Block. The BCM will energize the relay when it receives a request from the HVAC control head (PCI bus message for Automatic Temperature Control or a MUX input for Manual Temp Control).

With the relay activated, it will supply battery voltage to the rear window defogger grid along with heat mirrors if so equipped.