Pontiac 1999 Bonneville, Owner'S Manual

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yellow blue
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Sometimes, strong magnetic fields can affect the
compass. If the CALIBRATE light comes on as shown
above, try calibrating the compass as follows:
1. Drive the car to an open, flat area.
2. Press and hold the MODE button until the
CALIBRATE light reappears.
3. Release the MODE button. The heading display will
start to rotate.
4. Drive the car in small circles. Don’t drive faster than
10 mph (16 km/h).
5. Drive in circles until the CALIBRATE light goes
out. It usually takes one to five circles.
6. Your compass should be calibrated. You will know
this when the direction bars are on and the
CALIBRATE light is off.
Compass Accuracy
Your compass may show different headings around
bridges, power lines, large metal objects and steep hills.
This is normal and is true of compasses in general.
If you put large metal objects like golf clubs in the trunk
they could affect accuracy. If the accuracy is close, the
compass will adapt to these objects over time.
If you use an antenna with a magnetic base, it is best to
mount it away from the center of the trunk near the
rear window.
The rear defog system can affect accuracy, and the
compass corrects for the rear defog. However, if the rear
defog is turned on while making sharp turns, the
accuracy may be off. When you turn the rear defog off
again, the accuracy returns to normal.
Do not turn on the rear defog if you are trying to
calibrate. The system will not allow the calibration. You
will hear the chime, and CALIBRATE will flash for a
few seconds.
Be aware that metal objects are sometimes buried in the
ground. They can affect accuracy and you may not know
they are there. As an example, many concrete roads
have metal reinforcements inside.