Audio-navigation unit power will not turn on (No information display on touch screen) (Without Auto Idle Stop System)

NOTE: 

• Check the vehicle 12 volt battery condition first - Refer to:

  12 Volt Battery Test (With Auto Idle Stop System) or

  12 Volt Battery Test (Without Auto Idle Stop System) .

• Check the connectors for poor connections or loose terminals.

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   - 2. Press the POWER button on to see if the audio-navigation unit turns on.

   Does the audio system operate properly, and does the audio sound normal?

   YES 

   Intermittent failure, the system is OK at this time.

   NO 

   The failure is duplicated, go to step 2.

2. Fuse check

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

   - 2. Check the following fuses.

   Fuse	No. A29 (20 A)
   Location	Under-hood fuse/relay box

   Fuse	No. C40 (7.5 A)
   Location	Under-dash fuse/relay box

   Are the fuses OK?

   YES 

   Go to step 3.

   NO 

   Replace the fuse(s), and recheck. If the fuse(s) blows again, check for a short in the No. A29 (20 A) fuse and/or the No. C40 (7.5 A) fuse circuits.

3. Open wire check (+B AUDIO line)

   -1. Disconnect the following connector.

   Audio-navigation unit connector A (24P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio-navigation unit connector A (24P): disconnected
   Test point 1	Audio-navigation unit connector A (24P) No. 3 - Go to: Audio-Navigation Unit Connector For Inputs And Outputs (2016)
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The +B AUDIO wire is OK. Go to step 4.

   NO 

   Repair an open in the wire between the No. A29 (20 A) fuse in the under-hood fuse/relay box and the audio-navigation unit.

4. Open wire check (ACC line)

   -1. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	Audio-navigation unit connector A (24P): disconnected
   Test point 1	Audio-navigation unit connector A (24P) No. 24 - Go to: Audio-Navigation Unit Connector For Inputs And Outputs (2016)
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The ACC wire is OK. Go to step 5.

   NO 

   Repair an open in the wire between the No. C40 (7.5 A) fuse in the under-dash fuse/relay box and the audio-navigation unit.

5. Open wire check (GND line)

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

   - 2. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Audio-navigation unit connector A (24P): disconnected
   Test point 1	Audio-navigation unit connector A (24P) No. 1 - Go to: Audio-Navigation Unit Connector For Inputs And Outputs (2016)
   Test point 2	Body ground

   Is there continuity?

   YES 

   The GND wire is OK. Go to step 6.

   NO 

   Repair an open or high resistance in the wire between the audio-navigation unit and body ground (G404).

6. Audio-navigation unit check (substitution)

   -1. Substitute a known-good audio panel. Go to: Audio-Navigation Unit (2016 2017 2018)

   - 2. Reconnect audio-navigation unit connector A (24P), and recheck.

   Does the symptom go away?

   YES 

   Replace the original audio panel.

   NO 

   Replace The Audio-Navigation Unit .