Honda Accord 2008 Manual page 2678

07/11/02 10:05:51 61TA0000_230_0234
3. Go into the Diagnostic mode and use the Car Status
diagnostic (see page 23-189) to check the vehicle
speed pulse (VSP) and the BACK signals.
Are the vehicle speed pulse and the BACK signals
OK ?
YES − The problem may be a characteristic of the
system. Check to see if the problem occurs in the
same place in a known-good vehicle. If it does, the
problem could be in the database. Go to step 4.
NO −
• If the problem is the vehicle speed pulse,
troubleshoot the vehicle speed signal circuit. LT
BLU wire for open or short. If OK, swap a known-
good ECM/PCM. If the problem or symptom goes
away, replace the original ECM/PCM.
• If the BACK signal is indicated ON (I), when in
any shift lever position other than reverse,
troubleshoot the back-up light switch circuit or
MICU (A/T models).
4. Substitute a known-good navigation unit and check
to see if the problem occurs in the same place.
Does the problem occur in the same place?
YES − The problem is in the database and should
be considered a characteristic of the system.
Report the problem according to the Navigation
System Owner's Manual under Reporting Errors
and look for improvements in future databases.
NO − Replace the navigation unit (see page 23-240).
Navigation system will not accept security
code
NOTE:
• The system will not operate without the 4-digit
security (anti-theft) code. After 10 consecutive tries
you must cycle the key to continue trying.
• The Navigation System Diagnosis and Core Return
Form is available on ISIS, under Job aids and can be
printed out for recording this information. This
information will help the reman facility determine
what caused the failure.
• Always check for and resolve all CAN DTCs before
troubleshooting the navigation system.
• Verity that the correct navigation unit is installed for
this model. Go into the Diagnostic mode and use
Version (see page 23-190).
• Check for connectors for poor connections or loose
terminals.
• Before troubleshooting, make sure you have anti-
theft codes for the audio system and the navigation
system.
• Make sure that the correct DVD color and version are
installed.
• Inspect the DVD for dirt or damage.
• Check any official Honda service website for more
service information about the navigation system.
• Check the vehicle battery condition first.
1. Go into the Diagnostic mode and use the ECU Info
under the Unit Check diagnosis (see page 23-178).
A brief diagnostic will run for 20 seconds, and the
serial number is then displayed.
Is the serial number displayed?
YES − Go to step 4.
NO − Go to step 2.
2. Remove the navigation unit (see page 23-240).
3. Check the serial number on the label on the
underside of the navigation unit.
Is the serial number conf irmed on the underside of
the navigation unit?
YES − Go to step 4.
NO − Replace the navigation unit (see page 23-240).
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