Audio-Navigation System DTC 1306 (Navigation Unit)

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 (vehicle position should be detected in three dimensions).
• 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 the connectors for poor connections or loose terminals.

1. Problem verification

   -1. Clear the hard error codes .

   -2. Wait for at least 6 seconds.

   -3. Turn the vehicle to the ON mode.

   -4. Test-drive the vehicle at steady speed more than 12 mph (20 km/h) for about 1 minute.

   -5. 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)

   -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 

   Replace the audio-navigation unit .

   NO 

   Go to step 3.

3. 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 (50P)

   -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 (50P): disconnected
   Test point 1	PCM connector A (50P) No. 35
   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. Determine possible failure area (audio-navigation unit, PCM)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Reconnect PCM connector A (50P).

   -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 A (24P) No. 22
   Test point 2	Body ground

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

   YES 

   Replace the audio-navigation unit .

   NO 

   Replace the PCM .

5. Open wire check (VSP line)

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	PCM connector A (50P): disconnected
   Test point 1	Audio-navigation unit connector A (24P) No. 22
   Test point 2	Body ground

   Is there about 5.0 V?

   YES 

   Repair an open in the wire.

   NO 

   The VSP wire is not open. Go to step 6.

6. Shorted wire check (VSP line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   Audio-navigation unit connector A (24P)

   -3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (50P): disconnected
   	Audio-navigation unit connector A (24P): disconnected
   Test point 1	Audio-navigation unit connector A (24P) No. 22
   Test point 2	Body ground

   Is there 1.0 MΩ or more?

   YES 

   Replace the audio-navigation unit .

   NO 

   Repair a short to body ground in the wire.