Front Heated Seat System Operation

When either of the front heated seat switches are depressed a resistor multi-plexed signal is sent to the corresponding door module (Driver or Passenger). The applicable Door Module then sends a message via the Programmable Communications Interface (PCI) data bus network to the Memory Heated Seat Adjustable Pedal Module (MHSAPM), signaling the module to energize the heating element for the selected seat. Light Emitting Diodes (LEDS) in each switch indicate the level of heat in use. The switch LEDs are controlled by the applicable Door Module.

The MHSAPM energizes an integral solid-state relay, which supplies battery current to the seat heating elements. When high-temperature heating is selected, the heaters provide a boosted heat level during the first four minutes of operation after heating is activated. The heat output then drops to the normal selected-temperature level. If high-level heating is selected, the control system will automatically switch to the low level after two hours of continuous operation. Operation on the low setting turns off only when the ignition switch is turned off or the heated seat switch is pressed a second time indicating an off command.