K 1500 Yukon 4WD V8-5.3L VIN Z Flex Fuel (2003)
Seat Heater: Description and Operation
Heated Seats (Rear)
REAR HEATED SEAT COMPONENTS
The rear heated seat system consists of the following components:
-
Left and right seat cushion heater elements
-
Left and right heated seat control modules
-
Left and right heated seat switches
-
IGN 3 10A fuse
-
SEO B1 15A fuse
REAR HEATED SEAT OPERATION
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.
