Navigation System Symptom Troubleshooting - Audio-navigation Unit Power Switch Will Not Turn On (No Information Display On Touch Screen) (With Display Audio) (2017)

NOTE:

Check the vehicle 12 volt battery condition first .
Check the connectors for poor connections or loose terminals.

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.

Fuse check

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

- 2. Check the following fuses.

Fuse	No. A22 (15 A)
Location	Under-hood fuse/relay box

Fuse	No. B37 (7.5 A)
Location	Under-dash fuse/relay box

Are the fuses OK?

YES

Go to step 3.

Replace the fuse (s), and recheck. If the fuse (s) blows again, check for a short in the No. A22 (15 A) fuse and/or the No. B37 (7.5 A) fuse circuits.

Open wire check (+B AUDIO line)

-1. Disconnect the following connector.

NOTE: Eject all the discs before disconnecting the audio-navigation unit to prevent damaging the CD player load mechanism.

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 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2014), or Audio-Navigation Unit Connector for Inputs and Outputs (2015), or Audio-Navigation Unit Connector for Inputs and Outputs (With Display Audio) (2017)
Test point 2	Body ground

Is there battery voltage?

YES

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

Repair an open in the wire between the No. A22 (15 A) fuse in the under-hood fuse/relay box and the audio-navigation unit.

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 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2014), or Audio-Navigation Unit Connector for Inputs and Outputs (2015), or Audio-Navigation Unit Connector for Inputs and Outputs (With Display Audio) (2017)
Test point 2	Body ground

Is there battery voltage?

YES

The ACC wire is OK. Go to step 5.

Repair an open in the wire between the No. B37 (7.5 A) fuse in the under-dash fuse/relay box and the audio-navigation unit.

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 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2014), or Audio-Navigation Unit Connector for Inputs and Outputs (2015), or Audio-Navigation Unit Connector for Inputs and Outputs (With Display Audio) (2017)
Test point 2	Body ground

Is there continuity?

YES

The GND wire is OK. Go to step 6.

Repair an open or high resistance in the wire between the audio-navigation unit and body ground (G505).

Audio panel check (substitution)
-1. Substitute a known-good audio panel.

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

Does the symptom go away?

YES

Replace the original audio panel - Refer to: Audio-Navigation Unit Removal and Installation (2014 2015), or Audio-Navigation Unit Removal and Installation (With Display Audio) (2017) .

NO

Replace the audio-navigation unit - Refer to: Audio-Navigation Unit Removal and Installation (2014 2015), or Audio-Navigation Unit Removal and Installation (With Display Audio) (2017) .