Sierra 1500 2WD V8-6.0L Hybrid (2010)
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 HSM removes the battery voltage and grounds from the heating elements and 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 HSM. In response to this signal, the HSM opens the ground path to the seat cushion heater
element, leaving just the seat back heater active. At the same time, the HSM 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 MSM/HSM
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/HSM 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 to Electrical Power Management Description and Operation (See: Starting and Charging/Description and
Operation).
