AMBIENT TEMPERATURE SENSOR
The thermometer function is supported by the ambient temperature sensor, the Totally Integrated Power Module (TIPM), the Controller Area Network (CAN) data bus circuit, and the instrument cluster or Cab Compartment Node (CCN) compass/temperature display unit.
If the display shows “OC” (-45° C (-49° F)) or “SC” (60° C (140° F)), there is an OPEN or SHORT CIRCUIT that must be repaired.
The ambient temperature sensor circuit can also be diagnosed using the following Sensor Test, and Sensor Circuit Test. If the temperature sensor and circuit are confirmed to be OK, but the temperature display is inoperative or incorrect, replace the instrument cluster or CCN assembly.