RAM 3500 HD Truck 2WD L6-6.7L DSL Turbo VIN A (2007)
Ambient Temperature Sensor / Switch HVAC: Description and Operation
Operation
OPERATION
The ambient temperature sensor is a variable resistor that operates on a five-volt reference signal sent by the Totally Integrated Power Module (TIPM).
The resistance in the sensor changes as temperature changes, changing the temperature sensor signal circuit voltage to the TIPM. Based upon the
resistance in the sensor, the TIPM senses a specific voltage on the temperature sensor signal circuit. The TIPM then translates the voltage into a
temperature reading that it sent over the Programmable Communications Interface (PCI) data bus circuit to other modules utilizing temperature
information.
