GMC Cadillac CTS 2004 Owner's Manual page 109

2. Press and hold the on/off button until a zone
number appears on the display.
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.
Outside Power Mirrors
The control on the driver's door armrest operates both
outside rearview mirrors.
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