Navigation System Symptom Troubleshooting - The MID does not display the audio-navigation unit information

NOTE: 

• Check the vehicle 12 volt battery condition first .
• If the audio remote-HFL switch does not respond, go to Audio remote-HFL switch does not work properly (audio unit buttons work) troubleshooting .
• Check the connectors for poor connections or loose terminals.

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Select Audio, Navigation, and HFL from the multi-information display (MID) menu screen.

   Are audio, navigation, and HFL information displayed?

   YES 

   Intermittent failure, the system is OK at this time.

   NO 

   The failure is duplicated, go to step 2.

2. Shorted wire check (LVDS2+ line, LVDS2- line)

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

   -2. Disconnect the following connectors.

   Audio-navigation unit connector J (3P)

   Gauge control module connector C (3P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio-navigation unit connector J (3P): disconnected
   	Gauge control module connector C (3P): disconnected
   Test point 1	Audio-navigation unit connector J (3P) No. 1
   Test point 2	Body ground

   Test point 1	Audio-navigation unit connector J (3P) No. 2
   Test point 2	Body ground

   Is there 1.0 MΩ or more?

   YES 

   The LVDS2+ and the LVDS2-  wires are not shorted to ground. Go to step 3.

   NO 

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

3. Shorted wire check (LVDS2+ line to LVDS2- line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio-navigation unit connector J (3P): disconnected
   	Gauge control module connector C (3P): disconnected
   Test point 1	Audio-navigation unit connector J (3P) No. 1
   Test point 2	Audio-navigation unit connector J (3P) No. 2

   Is there 1.0 MΩ or more?

   YES 

   The LVDS2+ wire and the LVDS2-  wire are not shorted. Go to step 4.

   NO 

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

4. Shorted wire check (LVDS2 SH line to another lines)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio-navigation unit connector J (3P): disconnected
   	Gauge control module connector C (3P): disconnected
   Test point 1	Audio-navigation unit connector J (3P) No. 1
   Test point 2	Audio-navigation unit connector J (3P) No. 3

   Test point 1	Audio-navigation unit connector J (3P) No. 2
   Test point 2	Audio-navigation unit connector J (3P) No. 3

   Is there 1.0 MΩ or more?

   YES 

   The LVDS2 SH wire is not shorted. Go to step 5.

   NO 

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

5. Open wire check (LVDS2+ line, LVDS2- line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio-navigation unit connector J (3P): disconnected
   	Gauge control module connector C (3P): disconnected
   Test point 1	Audio-navigation unit connector J (3P) No. 1
   Test point 2	Gauge control module connector C (3P) No. 1

   Test point 1	Audio-navigation unit connector J (3P) No. 2
   Test point 2	Gauge control module connector C (3P) No. 2

   Is there 1.0 Ω or less?

   YES 

   The LVDS2+ and the LVDS2-  wires are OK. Go to step 6.

   NO 

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

6. Audio-navigation unit check (substitution)

   -1. Substitute a known-good audio-navigation unit.

   -2. Reconnect all the connectors, and recheck.

   Does the symptom go away?

   YES 

   Replace the original audio-navigation unit .

   NO 

   Replace the gauge control module .