*38
*39
Yaw Rate Tuning
Car Status
23-315
Return
Set
Reset
CCW
CW
Tuning
0.0%
ANG- Disp
0°
Return
Car Status
0
VSP
ILL
BACK
ILL CANCEL
0
0
0
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 functions properly,
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, CW, or Set buttons. These are
used for factory setup only.
Two tests are explained below. For large problems with
the sensor values, the stationary test usually confirms
whether the sensor is defective. For yaw rate issues
related to driving, do 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.
You can touch Reset to clear ANG-Disp, and dotted
lines.
If either test above fails, please enter Yaw rate
sensor defective for the problem description, on
the Navigation core return form.
NOTE: The CCW, CW and Set buttons are disabled,
and cannot be activated.
Use this screen to confirm that the navigation unit is
properly receiving input signals. Signals equal to (0) are
OFF, and signals equal to (1) are ON. If the value on the
display does not match the actual vehicle status, then
check the wire carrying the signal.
• VSP-Vehicle Speed Pulse from ECM/PCM
(Connector A (24P) terminal No. 15)
a) OFF (0) when vehicle is not moving
b) ON (1) when vehicle is moving
The VSP comes from the ECM/PCM as a dedicated
signal. Internally, the navigation unit compares the
actual VP on the map against street data to adjust the
pulse to speed scaling factor. As this scaling factor
becomes more accurate, the Level gradually increases
from 0 to 10 (see the Tire Calibrate diagnostic screen).
• BACK-Reverse indication from taillight relay
(Connector C (8P) terminal No. 7)
a) OFF (0) when the shift lever is in any position other
than reverse
b) ON (1) when the shift lever is in reverse
The Back signal is used by the navigation unit to allow
the map screen to show the VP moving backwards
when in reverse. This signal is needed because the
Speed Pulse has no direction indication.
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