Chevrolet 2003 Tahoe Owner's Manual page 134

Cleaning the Mirror Temperature Display
When cleaning the mirror, use a paper towel or similar
material dampened with glass cleaner. Do not spray
glass cleaner directly on the mirror as that may cause
the liquid cleaner to enter the mirror housing.
Automatic Dimming Rearview Mirror
with Compass and Temperature
Display
If your vehicle is equipped with an electrochromic
mirror, it will, when on, automatically dim to the
proper level to minimize glare from lights behind you
after dark.
The mirror also includes a display in the upper right
corner of the mirror face. The compass reading and the
outside temperature will both appear in the display at
the same time. The dual display can be turned on or off
by briefly pressing either the TEMP or the COMP
button.
The temperature can be displayed by pressing the
TEMP button. Pressing the TEMP button once briefly,
will toggle the temperature reading on and off. To
alternate the temperature reading between Fahrenheit
and Celsius, press and hold the TEMP button for
approximately four seconds until the display blinks O F
and "C. Press and release the TEMP button to
toggle between the Fahrenheit and Celsius readings.
After approximately four seconds of inactivity, the display
will stop blinking and display the last selection made.
Press and release the TEMP button to toggle the
temperature display between Fahrenheit or Celsius.
If an abnormal reading is displayed, please consult your
dealer.
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