Honda Civic. Manual — part 918

GPS DATA CHART

YAW RATE

This diagnostic checks the yaw rate sensor in the control unit. This device detects
when the vehicle turns, and repositions the vehicle position icon on the map screen.
For more detailed information, see YAW RATE SENSOR theory of operation
under System Description.

Sensor indicates the voltage output from the yaw rate sensor. It should indicate
about 2.500 V when stopped.

Offset is the reference voltage or standard within the yaw rate sensor. It also
should indicate about 2.500 V when stopped.

A sensor output voltage LOWER than the Offset voltage indicates that the
vehicle is turning to the right.

NOTE:

The data shown in the GPS Detail screen is an example
only.

Column

Description

Problem indication

3D

Active satellites
(Yellow Dot)

If 3D is missing follow GPS icon is white or
not shown (see GPS ICON IS WHITE OR
NOT SHOWN).

PRN The satellite ID number

ST

The status: 0 = cannot
view or searching, 2 =
acquiring

If all 0, then, follow GPS icon is white or not
shown troubleshooting (see GPS ICON IS
WHITE OR NOT SHOWN).

AZI

Azimuth, the angle (0-
360) clockwise from
north

EL

Elevation from the
horizon (90 deg is
overhead)

C/N

N/A

Healthy signal is 49-52, no signal: 27-33

ACC N/A

2008 Honda Civic EX

2006-08 ACCESSORIES & EQUIPMENT Navigation System - Civic (Except Hybrid)

A sensor output voltage HIGHER than the Offset voltage indicates that the
vehicle is turning to the left.

The yaw rate offset and sensor should both indicate about 2.500 V when
stopped. If either reads zero or 5.000 V, replace the navigation unit.

The yaw rate offset and sensor should be within +/- 0.01 V of each other when
stopped. The sensor value should change relative to the offset as the car is
turned while driving. If not, replace the navigation unit.

Example: Vehicle stopped

VEHICLE STOPPED SPECIFICATION

Example: Vehicle turning

VEHICLE TURNING SPECIFICATION

The settings CCW Cal Factor, CW Cal Factor, and Set are for factory use only.
THIS SHOULD NEVER BE USED.

Normal

Abnormal

Offset

2.526 V

Offset

2.526 V

Sensor

2.516-2.536 V

Sensor

2.623 V

Normal

Abnormal

Offset

2.526 V

Offset

2.526 V

Sensor

2.678 V (right turn)
2.478 V (left turn)

Sensor 2.623 V (no change on turns)

NOTE:

Do not try to adjust the yaw rate sensor without
instructions from the factory. See next paragraph for
tuning.

2008 Honda Civic EX

2006-08 ACCESSORIES & EQUIPMENT Navigation System - Civic (Except Hybrid)

Fig. 61: Diagnostic Menu Screen Display - Yaw Rate
Courtesy of AMERICAN HONDA MOTOR CO., INC.

YAW RATE TUNING

This diagnostic allows you to graphically display problems with the yaw rate
sensor.

The ANG-Disp value accumulates any differences between the offset, and
sensor voltages (see Yaw Rate diagnostic). When the sensor is healthy, the
random changes in these two voltages generally cancels out, so the value is 0.
However if one voltage is consistently higher than the other, then the ANG-
Disp value accumulates the constant change.

The Reset button temporarily clears the angular accumulation (ANG-Disp),
and clears the display dots.

Do not touch the CCW or CW, or Set buttons. These are used for factory setup
only.

For serious problems with the sensor, the stationary test usually confirms whether
the sensor is defective. For yaw rate issues related to driving, perform the road test
described below.

1. Stationary test: If the-VP icon spins in place and the ANG-Disp value slowly

increases or decreases in value, the yaw rate sensor is defective. Replace the
Navigation unit.

2. Road test: Drive the vehicle on a very straight road. Enter the diagnostic mode,

select Yaw rate, and touch the Tuning button. While driving down a straight
road, the white dots should trace a straight line across the screen. However, if
you are driving on a straight road, and you notice the dots constantly dropping
down or heading up as you drive, the navigation unit's yaw sensor is defective.

2008 Honda Civic EX

2006-08 ACCESSORIES & EQUIPMENT Navigation System - Civic (Except Hybrid)

You can touch Reset to clear ANG-Disp, and dotted line.

3. If either test fails, please enter "Yaw rate sensor defective" for the problem

description, on the "Navigation core return form".

Fig. 62: Diagnostic Menu Screen Display - Yaw Rate Tuning
Courtesy of AMERICAN HONDA MOTOR CO., INC.

TIRE CALIBRATION

As the vehicle moves, the navigation system receives speed pulses from the
ECM/PCM. These pulses are converted using a conversion factor to a mph speed
that moves the vehicle position (VP) on the map. The navigation system has an
internal tuning function that generates and refines this factor based on actual
driving. The Level indicates the status of the tuning. At navigation initialization, it
begins at 0, and increases to 10 as the navigation system is used.

The Auto Tuning is factory set to ON, and should remain on.

The Study indicates the tuning status. If it is less than 10, the unit is still
calibrating.

The Tire-Cal. Tuning and Set should not be used. It is for factory use only.

Fig. 63: Diagnostic Menu Screen Display - Tire Calibration
Courtesy of AMERICAN HONDA MOTOR CO., INC.

FUNCTIONAL SETUP

2008 Honda Civic EX

2006-08 ACCESSORIES & EQUIPMENT Navigation System - Civic (Except Hybrid)