Temperature Display

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The inside rearview mirror supplies a 5 volt signal circuit and low reference circuit to the ambient air temperature sensor. As the outside air temperature gets warmer, the ambient air temperature sensor will pull the voltage lower on the 5 volt signal circuit. The inside rearview mirror monitors this voltage and will show this as a warmer temperature on the display. Temperatures exceeding 112°C (143°F) will be out of the mirror's temperature range which SC will be shown on the temperature display. In colder outside air temperatures, the ambient air temperature sensor will not pull the voltage as low on the 5 volt signal circuit. The inside rearview mirror will show a colder temperature on the display. Temperatures exceeding -40°C (-40°F) will be out of the mirror's temperature range which OC will be shown on the temperature display. In cold temperatures such as 3°C (37°F) or below, the temperature display will show ICE when the ignition is first turned on. The display will toggle between ICE and the actual outside temperature until the temperature update process is complete.