Windows and Glass: Testing and Inspection

Mirrors - Temperature Display Inaccurate

Diagnostic Aids

- An inaccurate temperature display indicates an abnormal resistance condition within the system.
- For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

The following table will be used to measure the resistance of the sensor and compare it with the actual ambient temperature. The mirror's temperature accuracy should be within 5 degrees of the actual temperature. The actual temperature should not be taken from a radio station, a sign displaying the temperature, etc. A temperature measuring tool such as a thermometer should be used. Some temperature measuring tools may be within 5 degrees of the actual temperature. Make sure to consult the manufacturer for the accuracy of the tool. This comparison can make the mirror seem off by 5-10 degrees of the actual temperature when it is not.