NAVIGATION SYSTEM
AV-77
C
D
E
F
G
H
I
J
L
M
A
B
AV
DIAGNOSIS BY HISTORY OF ERRORS
The “Self-diagnosis” results indicate whether an error occurred during the period from when the ignition switch
is turned to ON until “Self-diagnosis” is completed.
If an error occurred before the ignition switch was turned to ON and does not occur again until the “Self-diag-
nosis” is completed, the diagnosis result will be judged normal. Therefore, those errors in the past, which can-
not be found by the “Self-diagnosis,” must be found by diagnosing the “History of Errors”.
The History of Errors displays the time and place of the most recent occurrence of that error. However, take
note of the following points.
●
Correct time of the error occurrence may not be displayed when the GPS antenna substrate within the AV
and NAVI control unit has malfunctioned.
●
Place of the error occurrence is represented by the position of the current-location mark at the time when
the error occurred. If the current-location mark has deviated from the correct position, then the place of
the error occurrence max be located correctly.
●
The maximum number of occurrences which can be stored is 50. For the 51st and later occurrences, the
displayed number remains 50.
When a reproducible malfunction occurred but its cause cannot be identified because several errors are
present, record the item, number and place (longitude/latitude) of error occurrence (or delete the History of
Errors), then turn ignition switch from OFF to ON to reproduce the malfunction. Check the History of Errors to
find the items which show an increased number of occurrences, and diagnose the item.
Error item
Possible causes
Example of symptom
Action/symptom
Gyro sen-
sor discon-
nected
Communications malfunction between NAVI control unit and
internal gyro
●
Navigation location detection performance has
deteriorated.
(Angular velocity cannot be detected.)
●
Perform self-diagnosis.
●
When the AV and NAVI control unit is judged normal by self-
diagnosis, the symptom may be intermittent, caused by strong
radio interference.
GPS dis-
connected
Communication error between AV and NAVI control unit and
internal GPS substrate
●
Navigation location detection performance has
deteriorated.
(Location correction using GPS is not performed.)
●
GPS receiving status remains gray.
●
Perform self-diagnosis.
●
When the AV and NAVI control unit is judged normal by self-
diagnosis, the symptom may be intermittent, caused by strong
radio interference.
GPS trans-
mission
cable mal-
function
Malfunctioning transmission wires to AV and NAVI control unit
and internal GPS substrate
●
During self-diagnosis, GPS diagnosis is not per-
formed.
●
Perform self-diagnosis.
●
When the AV and NAVI control unit is judged normal by self-
diagnosis, the symptom may be intermittent, caused by strong
radio interference.
GPS input
line con-
nection
error
Malfunctioning receiving wires to AV and NAVI control unit and
internal GPS substrate
●
Navigation location detection performance has
deteriorated.
(Location correction using GPS is not performed.)
●
GPS receiving status remains gray.
●
Perform self-diagnosis.
●
When the AV and NAVI control unit is judged normal by self-
diagnosis, the symptom may be intermittent, caused by strong
radio interference.
GPS TCX0
over
GPS TCX0
under
Oscillating frequency of the GPS substrate frequency synchro-
nizing oscillation circuit exceeded (or below) the specification
●
Navigation location detection performance has
deteriorated.
(Location correction using GPS is not performed.)
●
GPS receiving status remains gray.
●
Perform self-diagnosis.
●
When the AV and NAVI control unit is judged normal by self-
diagnosis, the symptom may be intermittent, caused by strong
radio interference, or the control unit may have been sub-
jected to excessively high or low temperatures.