Audio-Navigation System DTC Troubleshooting: 1306
DTC 1306: Vehicle Speed Pulse
NOTE:
Check the vehicle 12 volt battery condition first.
This navigation DTC sets when there is a problem with the VSP circuit.
Check for aftermarket accessories that may interfere with the navigation system.
Check the GPS reception in an open area.
Aftermarket metallic window tint or electronic devices located near the audio-navigation unit or GPS antenna can potentially interfere with the operation of the navigation system.
Before you troubleshoot, make sure to follow the General Troubleshooting Information.
Check any official Honda service website for more service information about the navigation system.
Check the connectors for poor connections or loose terminals.
1.
Problem verification:

Problem verification
?1.
Clear the hard error codes.

?2.
Test-drive the vehicle at steady speed more than 12 mph (20 km/h) for about 1 minute.

?3.
Check for hard error codes.

Is DTC 1306 indicated?

     
YES
     
     
     
The failure is duplicated, go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time.?
2.
Determine possible failure area (audio-navigation unit, others):

Determine possible failure area (audio-navigation unit, others)
?1.
Go into the System Diagnostic Mode, and select the Vehicle Status in the Unit Check.

?2.
With the help of an assistant test-drive the vehicle, and watch the VSP status.

Does the VSP change from [0] (stopped) to [1] (driving) as you drive?

     
YES
     
     
     
     
NO
     
     
     
Go to step 3.
3.
Determine possible failure area (VSP line, others):

Determine possible failure area (VSP line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.
PCM connector A (51P)

?4.
Turn the vehicle to the ON mode.

?5.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
PCM connector A (51P): disconnected
Test point 1
PCM connector A (51P) No. 25
Test point 2
Body ground

Is there about 5.0 V?

     
YES
     
     
     
The VSP wire is OK. Go to step 4.
     
NO
     
     
     
Go to step 5.
4.
PCM check:

PCM check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Reconnect PCM connector A (51P).

?3.
Raise the vehicle on a lift.

?4.
Turn the vehicle to the ON mode.

?5.
Block the front tire of one side, and rotate the front tire slowly that is not blocked.

?6.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode, with the front tire slowly rotating
Test point 1
Audio-navigation unit connector C (24P) No. 14
Test point 2
Body ground

Does the voltage pulse between 0 V and 5 V as you rotate the tire?

     
YES
     
     
     
     
NO
     
     
     
Update the PCM if it does not have the latest software, or substitute a known-good PCM, and recheck.?
5.
Open wire check (VSP line):

Open wire check (VSP line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
PCM connector A (51P): disconnected
Test point 1
Audio-navigation unit connector C (24P) No. 14
Test point 2
Body ground

Is there about 5.0 V?

     
YES
     
     
     
Repair an open in the wire between the audio-navigation unit and the PCM.?
     
NO
     
     
     
The VSP wire is not open. Go to step 6.
6.
Shorted wire check (VSP line):

Shorted wire check (VSP line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Audio-navigation unit connector C (24P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector A (51P): disconnected
 
Audio-navigation unit connector C (24P): disconnected
Test point 1
Audio-navigation unit connector C (24P) No. 14
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to body ground in the wire between the audio-navigation unit and the PCM.?
     
NO