Ambient Temperature Sensor / Switch HVAC: Description and Operation

Ambient Temperature Sensor Diagnostics
The outside temperature function is supported by the ambient temperature sensor; a signal and ground circuit hardwired to the compass/temp module (1.6L vehicles) or to the PCM (2.0L vehicles), and the Compass/Temp Mirror display.

If the Compass/Temp Mirror display indicates 60 degrees C (140 degrees F) or the ambient temperature sensor sense circuit is shorted to ground, the temp display will be 60 degrees C (140 degrees F) to indicate a SHORT circuit condition.

If the Compass/Temp Mirror display indicates -45 degrees C (-49 degrees F) or the ambient temperature sensor sense circuit is open, the temp display will be -45 degrees C (-49 degrees F) to indicate an OPEN circuit condition.

If there is an OPEN or SHORT circuit condition, it must be repaired before the Compass/Temp Mirror VF display can be tested.

The ambient temperature sensor can be diagnosed using the Sensor Test. If there are no codes stored in the PCM (2.0L vehicles) and the ambient temperature sensor and the circuits are confirmed to be OK, but the temperature display is inoperative or incorrect, replace the Compass/Temp Mirror.