Front

OPERATION

The heated seat switches for the front row seats are located in rear HVAC control assembly. The rear HVAC control is mounted in the lower portion of the instrument panel center stack. Amber Light Emitting Diodes (LEDS) in the top portion of 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 switch a second time will select low-level heating. Pressing the switch a third time will shut the heating elements off.

When either of the two momentary, push button-type 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 Controller Area Network (CAN) data bus. The instrument cluster then sends a message via the Local Interconnect Network (LIN) data bus to the heated seat module, signaling the module to energize the heating element for the selected seat.

The front heated seat switches are an integral part of the HVAC control unit. If the switches are inoperative or damaged in any way the complete HVAC control assembly must be replaced, Front.