GMC YUKON DENALI 1999 Owner's Manual page 116

Temperature Display
The temperature can be displayed by pressing the TEMP
switch. Pressing the TEMP switch once briefly will
toggle the temperature reading on and off. To alternate
the temperature reading between Fahrenheit and Celsius,
press and hold the TEMP switch for three seconds until
the display shows only F _ or C _ . Press and release the
TEMP switch to toggle between the Fahrenheit and
Celsius readings. After five seconds of inactivity, the
display will return to normal in the temperature scale
you have selected.
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The normal display will show a temperature reading in
degrees Fahrenheit or Celsius. If an abnormal reading is
displayed, please consult your dealer.
Electrochromic Mirror Operation
The TEMP side of the switch, located at the bottom of
the mirror, also turns the electrochromic inside and
outside mirrors on and off. An indicator light, located to
the right of the TEMP switch, will come on when the
electrochromic mirrors are turned on. To turn the
mirrors on, press and hold the TEMP switch for eight
seconds. The mirrors will darken and remain dark until
the button is released. To turn the mirrors off, press and
hold the TEMP switch for eight seconds.
Compass Operation
Press the COMP switch once briefly to turn the compass
on or off.
When the ignition and the compass feature are on, the
compass will show two character boxes for
approximately two seconds. After two seconds, the
mirror will display the compass heading.
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