2. ADJUSTING TIRE SIZE
Tire calibration is a required input for the Nav computer to base, tire rotation: distance
covered ratio. It should be checked to determine that the entered tire size is the same as
the tires equipped on the vehicle.
Additionally, if the vehicle does not have factory equipped tires installed, the tire calibration
will need to be changed to match the new tire size.
Press the Tire Calibration button from
the vehicle position screen. The
following message is displayed noting
the overwrite of existing values once
the procedure is completed.
Press continue to access the tire
adjustment screen.
Press the tire size and rotate the knob
to see if the tire size is listed.
Select the correct tire size and press
the button once again. Note that the
tire circumference size automatically
changes to the set tire size.
If the tire size is not listed the tire
circumference value must be entered
manually by rotating the tire size button
to the ??? position.
Press and adjust the actual tire size
dimension in millimeters.
This value is available from the tire
manufacture or it can be measured as
illustrated on the next page.
Once the correct tire size or circumference has been entered, press the return button to
return to the information screen or press the continue button to go on to the Precision
Adjustment screen.
36
On-Board Monitor and Navigation Systems
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