Navigation System Symptom Troubleshooting - Voice guidance cannot be heard, is broken up, or there is static

NOTE: 

• Check the vehicle 12 volt battery condition first .
• Check the volume and voice feedback setting for the navigation system in set-up.
• Check the connectors for poor connections or loose terminals.

1. Problem verification

   -1. Check the navigation voice guidance output.

   Does the system output the voice guidance?

   YES 

   Intermittent failure, the system is OK at this time.

   NO 

   The failure is duplicated, go to step 2.

2. Determine possible failure area (voice guidance output circuit, others)

   -1. Go into the System Diagnostic Mode, and use the speaker check mode .

   Did all speakers produce a tone?

   YES: With stereo amplifier

   Go to step 3.

   YES: Without stereo amplifier

   Replace the audio-navigation unit .

   NO: The sound is cannot be heard in all speakers

   Go to No sound is heard from all the speakers (display is normal) troubleshooting .

   NO: The sound is cannot be heard in front center speaker

   Go to Audio system sound is weak or distorted (display is normal) troubleshooting .

3. Shorted wire check (AUX NAVI line, AUX NAVI GND line)

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

   -2. Disconnect the following connectors.

   Audio-navigation unit connector B (24P)

   Stereo amplifier connector C (16P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio-navigation unit connector B (24P): disconnected
   	Stereo amplifier connector C (16P): disconnected
   Test point 1	Audio-navigation unit connector B (24P) No. 13
   Test point 2	Body ground

   Test point 1	Audio-navigation unit connector B (24P) No. 14
   Test point 2	Body ground

   Is there 1.0 MΩ or more?

   YES 

   The AUX NAVI and the AUX NAVI GND wires are not shorted to ground. Go to step 4.

   NO 

   There is a short to body ground in the wire. Replace the affected shielded harness.

4. Shorted wire check (AUX lines)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio-navigation unit connector B (24P): disconnected
   	Stereo amplifier connector C (16P): disconnected

   Test point 1:Audio-navigation unit connector B (24P)	Test points 2:Audio-navigation unit connector B (24P)
   No. 1	No. 2, No. 13, No. 14

   Test point 1:Audio-navigation unit connector B (24P)	Test points 2:Audio-navigation unit connector B (24P)
   No. 2	No. 13, No. 14
   No. 13	No. 14

   Is there 1.0 M? or more between any of the terminals?

   YES 

   The AUX wires are not shorted in the wires. Go to step 5.

   NO 

   There is a short in the wires. Replace the affected shielded harness.

5. Open wire check (AUX NAVI line, AUX NAVI GND line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio-navigation unit connector B (24P): disconnected
   	Stereo amplifier connector C (16P): disconnected
   Test point 1	Audio-navigation unit connector B (24P) No. 13
   Test point 2	Stereo amplifier connector C (16P) No. 12

   Test point 1	Audio-navigation unit connector B (24P) No. 14
   Test point 2	Stereo amplifier connector C (16P) No. 5

   Is there 1.0 Ω or less?

   YES 

   The AUX NAVI and the AUX NAVI GND wires are OK. Go to step 6.

   NO 

   There is an open in the wire(s). Replace the affected shielded harness.

6. Stereo amplifier check (substitution)

   -1. Substitute a known-good stereo amplifier .

   -2. Reconnect all the connectors, and recheck.

   Does the symptom go away?

   YES 

   Replace the original stereo amplifier .

   NO 

   Replace the audio-navigation unit .