Heated Seats

With the ignition switch in ON, battery voltage is provided to the coil of the seat heater relay. The coil of the relay is grounded at G404. Battery voltage is provided through the closed contacts of the energized relay to both seat heater switches.

Two heaters are provided in each font seat. One is located in the seat cushion and other is in the seat back.

When the driver's seat heater switch is in the LO position, current flows in the series through the seat heater switch, the WHT/BLK wire, and the cushion and back seat heaters to G501. Current is limited because it is flowing through both seat heaters in series and the seat warms to a low temperature.

When the switch is in the HI position, current flows through the seat heater switch, the WHT/BLU wire, the circuit breaker and thermostat, and through the cushion and seat back heaters in parallel. The seat cushion heater is now grounded through the WHT/BLK wire and the driver's seat heater switch to G403. The seat back heater is grounded at G501. Since the cushion and seat back heaters are now in parallel, current flow through the heaters is increased and the seat warms to its maximum temperature. The circuit breaker and thermostat in the seat cushion will be open at 104°F (40°C) to maintain a constant seat temperature and prevent overheating. The front passenger's seat heaters work the same way.