Cadillac 2007 SRX Owner's Manual page 136

To adjust for compass variance, do the following:
1. Find your current location and variance
zone number on the zone map that follows.
2. Press and hold the on/off button until a zone
number appears on the display.
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3. Once the zone number appears on the
display, press the on/off button quickly
until you reach the correct zone number.
If C appears in the compass window,
the compass may need calibration. See
"Compass Calibration" listed previously.
Cleaning the Mirror
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.