Silverado 1500 4WD V8-6.0L Hybrid (2009)
Seat Heater: Description and Operation
Heated Seats Description and Operation
Heated Seats Description and Operation
Heated Seat Components
The driver and passenger heated seat system consists of the following components:
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Heated seat switch
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Door lock/window switch
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Memory seat module
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Seat cushion heating element
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Seat back heating element
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Seat cushion temperature sensor
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Seat back temperature sensor
Modes of Operation
The heated seat module (MSM) controls heated seat operation for both the driver and passenger seats. There are 2 modes of operation available for
heated seats; both the seat cushion and seat back heat, or seat back only heat. When a heated seat temperature signal request is received, the MSM will
activate both the seat cushion and seat back heating elements. When the heated seat BACK ONLY mode button is pressed once the MSM will deactivate
the seat cushion heating element and leave the seat back heating element ON.
Heated Seat Switch/LED Indicators and System Operation
The left and right heated seats are controlled by separate heated seat switches located in the door panels. Ground is supplied to the heated seat switches
through the switch low reference circuits from their respective door lock/window switches. The door lock/window switches also control the heated seat
switch heat mode and temperature indicators. The memory seat module (MSM) controls the heated seat operation for both, the left and right heated seats.
The following describes the sequence of operation and how the MSM responds to each of the switch inputs.
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High Temperature-When the heated seat switch is pressed once, ground is applied through the switch contacts and the switch signal circuit to the
door lock/window switch indicating the high heat request. In response to this signal, the door lock/window switch applies a low current voltage
through the 3 temperature indicator control circuits illuminating all 3 LEDs indicating the high temperature mode. The switch then sends a
message via the GMLAN serial data line to the MSM indicating the heated seat request. The MSM then applies battery voltage through the heating
element supply voltage circuit to the seat cushion and seat back heating elements. At the same time, it supplies a ground through the element low
reference circuits to the seat heating elements.
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Medium Temperature-When the switch is pressed a second time, the MSM sets the temperature level to medium heat. The door lock/window
switch removes the voltage from the high temperature indicator leaving 2 LEDs illuminated indicating the medium temperature mode.
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Low Temperature-When the switch is pressed a third time, the MSM sets the temperature level to low heat. The door lock/window switch removes
the voltage from the medium temperature indicator leaving 1 LED illuminated indicating the low temperature mode.
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System OFF State-When the switch is pressed a fourth time, the MSM removes the battery voltage and grounds from the heating elements. The
door lock/window switch removes the voltage from the low temperature indicator, indicating the system OFF state.
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Back Only Mode-When the heated seat is ON and the BACK ONLY mode button is pressed, ground is applied through the switch contacts and the
heated seat back only mode signal circuit to the door lock/window switch. In response to this signal, the door lock/window switch sends a
GMLAN message to the MSM indicating the back only mode request. The MSM then opens the ground path to the seat cushion heater element,
leaving the seat back heater active. The door lock/window switch turns OFF the seat cushion/back mode indicator, then applies a low current
voltage through the heated seat back only mode indicator control circuit illuminating the back only mode indicator.
Temperature Regulation
The heated seat system is designed to warm the seat cushion and seat back to 3 different temperature settings; High, MED, and Low. The memory seat
module (MSM) monitors the seat temperature through the temperature sensor signal circuits and the temperature sensors (thermistor) that are located in
the seat cushion and the seat back. The temperature sensors are variable resistors, their resistance varies as the temperature of the seat changes. When the
temperature sensor resistance indicates to the MSM that the seat has reached the desired temperature, the module opens the ground path of the seat
heating elements through the heated seat element control circuit. The module will then cycle the element control circuit open and closed in order to
maintain the desired temperature.
Load Management
The electrical power management function is designed to monitor the vehicle electrical load and determine when the battery is potentially in a high
discharge condition. The heated seat system is one of the vehicle loads that is subject to reduction during a battery discharge condition. For more
information on load management refer toElectrical Power Management Description and Operation (See: Starting and Charging/Description and
Operation) .
