CTS V8-5.7L VIN P (2004)
Compass: Description and Operation
COMPASS
The mirror uses two magnetic field sensors for compass direction. One sensor is for north and south, the other is for east and west. The mirror supplies
a signal and low reference to each sensor. As the vehicle travels with or against the earth's magnetic pull, there will be a change in voltage on one or
both sensors. As a result of the change in voltage, the mirror changes the heading on the compass display.
COMPASS CALIBRATION
Before calibrating the compass, drive the vehicle to an open area that is magnetically clean or free of large metallic objects such as high tension power
lines or large steel buildings. Verify there are no magnetized roof antennas, magnets on or hanging from the mirror, or any other magnetized objects
on the inside or outside of the vehicle close to the mirror.
1. Start the engine.
IMPORTANT: Before calibrating the compass, make sure the mirror has the correct zone number. Refer to Compass Magnetic Variation
Adjustment.
2. Press and hold the switch for the compass, which may be depicted as COMP, COMPASS, or on/off (w/UE1) depending on the type of mirror on
the vehicle, until the letter "C" or "CAL" is displayed.
3. Drive the vehicle in circles at a speed of less than 8 km/h (5 mph) until the "C" or "CAL" is replaced by a proper vehicle heading. The calibration
procedure is now complete.
COMPASS MAGNETIC VARIATION ADJUSTMENT
Magnetic variation adjustments are required when the compass displays a constant error in heading. Variation is the difference between magnetic
north and true north due to geographical location.
World Magnetic Variation Map
1. Locate your current geographic location on the World Magnetic Variation Map.
2. Turn ON the ignition, with the engine OFF.
3. Press and hold the switch for the compass, which may be depicted as COMP, COMPASS, or on/off (w/UE1) depending on the type of mirror on
the vehicle, until a zone number appears on the compass display.
4. Depress the switch for the compass to select the desired zone number.
5. Wait 5 seconds. The display will return to a compass heading. The variance procedure is now complete.
6. Calibrate the compass. Refer to Compass Calibration mentioned above.