Impala V6-3.8L SC VIN 1 (2005)
Seat Heater: Description and Operation
HEATED SEATS DESCRIPTION AND OPERATION
HEATED SEAT SYSTEM COMPONENTS
The Heated Seat System consists of the following components:
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Driver heated seat relay
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Driver heated seat switch
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Driver seat back heater element
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Driver seat cushion heater element
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Passenger heated seat relay
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Passenger heated seat switch
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Passenger seat back heater element
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Passenger seat cushion heater element
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LH HTD ST/BCM 15-amp fuse
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RH HTD SEAT 15-amp fuse
HEATED SEAT SYSTEM CONTROLS
The Heated Seat System is controlled by the following components:
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Body control module (BCM)
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Driver heated seat relay
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Driver heated seat switch
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Passenger heated seat relay
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Passenger heated seat switch
HEATED SEAT SYSTEM DESCRIPTION
The heated seat relay controls the battery positive voltage used to supply the seat heater elements. Voltage is supplied to the heated seat switch from
the body control module (BCM). When the heated seat switch is in the high or low position voltage is supplied through the ON switch signal circuit to
the heated seat relay. Voltage to the high/low switch signal circuit is reduced by the resistors within the heated seat switch, high or low seat heater
operation is determined by the voltage level to the heated seat relay. The heated seat relay uses the resistance through the heated seat thermistor to
regulate the seat temperature. When the heated seat reaches the maximum temperature for high or low operating modes the battery positive voltage
supply to the seat heater elements is removed. When the seat cools the resistance value through the heated seat thermistor returns to the limits set for
high or low heated seat operation and the heated seat relay provides the battery positive voltage supply to the heated seat element supply circuit.
The BCM controls the voltage supply circuit to the heated seat switch for the purpose of load management control. The load management control
feature allows the BCM to reduce the load on the vehicles charging system when inputs to the powertrain control module (PCM) indicate the demand
is greater than the generator is able to supply.
