Rear Heated Seat Operation

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The rear heated seat system will heat the rear seat cushions in high or low heat modes. Battery voltage to the seat cushion heater elements is controlled by the heated seat control modules using inputs from the heated seat switches and the seat cushion temperature sensors. The heated seat switch signal circuit is supplied with a reference voltage through a resistor and monitored within the control module. The heated seat switch is a momentary contact type and when activated the signal circuit is briefly closed to ground. Whenever the control module receives an active switch input, the heated seat operating mode is determined by whatever the current mode may be, from off to high then low. The control module monitors the seat cushion temperature by sending a signal voltage through a thermistor located in the heater element pad. The control module cycles the battery voltage circuit to the heater element as necessary in order to maintain the desired seat cushion temperature.