Front Seats

OPERATION

The heated seat switches receive battery current through a fused ignition switch output (run) circuit when the ignition switch is in the On position. When either of the front heated seat switches are depressed a resistance signal is sent to the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN). The instrument cluster receives this message via the Local Interconnect Network (LIN) data bus. The instrument cluster then sends a message via the Controller Area Network (CAN) data bus to the heated seat module, signaling the module to energize the heating element for the selected seat.

If the heated seat switch is depressed to a different position (Low or High) than the currently selected state, the CCN will go through the process again to change the temperature setting. If a heated seat switch is depressed a second time to the same position as the currently selected state, the CCN and heated seat module interprets the second input as a request to turn the seat heater OFF. The CCN will then signal the heated seat module to turn the heated seat elements for that seat off.