Outside Temperature Sensor

This sensor is located to rear of radiator grille in a small protective housing. The sensor data from this sensor is processed by the BCM and displayed on the ECC control panel.

During periods of extended idle, engine heat can build up in engine compartment. This hot air surrounds sensor and results in readings which are higher than outside temperatures. To help eliminate these "false" readings, programming techniques are used to minimize unwanted temperature variations.

A temperature memory feature is used in the BCM outside temperature programming to help provide greater accuracy under engine restart conditions. When coolant temperature is less than 18°F (8°C), the actual outside temperature is displayed. However, if engine coolant is greater than 18°F (8°C) above the sensor reading, the previously memorized outside temperature is displayed.

Also, at vehicle speeds less than or equal to 20 MPH, the BCM limits the displayed temperature value to an increase rate of one degree every 100 seconds. This compensates for heat build up in engine compartment.

At speeds 20 to 45 MPH, the outside temperature display is allowed to increase after a 2 minute delay period. At speeds over 45 MPH, or if the sensor reading is less than the displayed value, there is no time delay and normal display function resumes.