Ambient Temperature Sensor / Switch HVAC: Description and Operation
AMBIENT TEMPERATURE SENSORThe ambient air temperature is monitored and displayed by the Compass/Temperature Module. The Compass/Temperature Module receives a hardwire input from the ambient temperature sensor (ATS). The ATS is mounted on the center support brace in front of the A/C condenser, behind the front grille.
The ATS cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.
The ATS is a variable resistor that operates on a 5-volt reference signal circuit hardwired from the Compass/Temperature Module. The resistance in the ATS changes as the outside temperature rises or falls. The Compass/Temperature Module senses the change in reference voltage through the ATS resistor. Based on the resistance of the ATS, the Compass/temperature Module is programmed to correspond to a specific temperature The Compass/Temperature Module then displays the proper ambient temperature.
The ATS can be diagnosed using the Ambient Temperature Sensor Test.
Ambient Temperature Sensor Test
Test the ATS circuits using the diagnostics in the Body Diagnostic Procedures. If the ATS and the circuits are confirmed to be OK, but the temperature display is inoperative or incorrect, replace the Compass/Temperature Module.
Refer to Body Control System.
Body Control Module
Refer to The Programmable Communication Interface Multiplex System (PCI Bus).
Information Bus