Vision V6-215 3.5L SOHC (1995)
Cabin Temperature Sensor / Switch: Description and Operation
In-Car Temp Sensor
DESCRIPTION
The Automatic Temperature Control (ATC) system uses various sensors which return electrical signals to the Body Control Module (BCM). The
In-Car Temperature Sensor is used on ATC equipped vehicles only. The In-Car Temperature Sensor is part of motorized aspirator assembly that is
mounted in the instrument panel. A small fan (in the sensor) draws air through an intake in the instrument panel (behind the name plate). This air
flows over a thermistor which measures interior vehicle temperatures. The ATC system then makes adjustments to maintain optimum passenger
compartment comfort.
OPERATION
The In-Car Sensor will automatically turn on when a vehicle door is opened. If the door is left open, the In-Car Sensor will automatically turn off
within approximately 5 minutes. If the door is then closed, but there is no ignition start, the In-Car Sensor will automatically turn off after
approximately 2 minutes. After the vehicle has been driven, the In-Car Sensor will turn off immediately when the ignition is turned off. The
aspirator motor in the In-Car Sensor operates whenever the ignition switch is on (even when the ATC system off button is pushed). If the In-Car
Sensor is open or shorted on this system, the digital display will turn off. Then the system defaults to manual operation.
NOTE: The In-Car Temperature Sensor assembly is not serviceable and must be replaced if found to be defective.
CIRCUIT OPERATION
Power for the in car temperature sensor is supplied from the Body Control Module (BCM) on circuit C1O.
Circuit C57 is the sensor return and is spliced with the other sensors in the system.
