Heated Seats

PRINCIPLES OF OPERATION

HEATED SEATS

The driver and passenger heated seats share a common ignition feed to the heated seat control switches and share a common ground to the seat backrest elements. The heated seat control switches are a latching type switch; continuity through the switch will remain regardless if voltage is supplied to the switch or not until the switch is pressed to place in the OFF setting. When the heated seat control switch is pressed with the ignition switch in RUN or START, voltage is supplied to the bi-metallic thermostat that is part of the seat cushion element. The seat cushion element and seat backrest element are wired in series and powered by the same output of the bi-metallic thermostat that is part of the seat cushion element. The heated seat control switch also will supply voltage to the separate indicator circuits at the dual automatic temperature control (DATC) module display panel to indicate an ON state. The heated seat will remain on until the heated seat control switch is pressed and voltage is no longer supplied to the bi-metallic thermostat. If the ignition source is removed from the heated seat, the heated seat system will return to the ON with the ignition switch in RUN state until the switch is pressed. The heated seat system is designed to heat the seat to 40°C (104°F) and maintain the temperature by the opening (no voltage to the heated seat elements) and closing (voltage supplied to the heated seat elements) of the bi-metallic thermostat.