Heated Seats - Operation

OPERATION

The heated seat system operates on battery current received through fused ignition switch output (run) circuits, so that the heated seat system will only operate when the engine is running. The heated seat system will turn off automatically whenever the engine is turned off.

The Heated Seat Module (HSM) is used to control the heated seat system. The HSM responds to heated seat switch and ignition switch status inputs and controls the 12v output to the heated seat elements, through integral solid-state relays.

The heated seat elements for the selected seat are energized when the heated seat switch is pressed. Light Emitting Diodes (LEDS) on each switch indicate the level of heat in use: Two LEDs are illuminated for high, one for low and none for off. Pressing the switch once will select high-level heating. Pressing the same switch a second time will select low-level heating. Pressing the switch a third time will shut the heating elements off.

The HSM energizes an integral solid-state relay, which supplies battery current to the heating elements. When high-level heating is initially selected, the HSM provides a boosted heat level during the first four minutes of operation, then the heat output level drops to normal high setting. When high setting is first selected, the system will automatically switch to low-level temperature after approximately thirty minutes of continuous operation. At that time, the number of illuminated indicator lamps in the heated seat switch change from two to one, indicating the temperature level change. Operation on low-level turns off automatically after approximately thirty minutes.

The system will automatically turn off the heating elements if it detects an open or short in the heating element circuit.