AUDIO UNIT POWER SWITCH WILL NOT TURN ON (No information display and no sound) (2016 2017 2018)

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 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.

   No. A29 - Refer to: Fuse to Components Index (With Auto Idle Stop System) (2016 2017 2018) Fuse to Components Index (Without Auto Idle Stop System) (2016 2017 2018) or

   No. C40 - Refer to: Fuse to Components Index (With Auto Idle Stop System) (2016 2017 2018) Fuse to Components Index (Without Auto Idle Stop System) (2016 2017 2018) or

   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 fuse and/or the No. C40 fuse circuits.

3. Open wire check (+B RADIO line)

   -1. Disconnect the following connector.

   Audio unit connector A (24P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio unit connector A (24P) disconnected
   Test point 1	Audio unit connector A (24P) No. 3 - Refer to: Audio Unit Connector for Inputs and Outputs [Display Audio Type (8-inch Screen)] (2016 2017 2018) or Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2016 2017) or Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2018) .
   Test point 2	Body ground

   Is there battery voltage?

   YES: Display Audio Type (8-inch Screen) or '16-17Color Audio Type (5-inch Screen)

   The +B RADIO wire is OK. Go to step 5.

   YES: '18Color Audio Type (5-inch Screen)

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

   NO 

   Repair an open in the wire between the No. A29 fuse - Refer to:

   Fuse to Components Index (With Auto Idle Stop System) (2016 2017 2018) or

   Fuse to Components Index (Without Auto Idle Stop System) (2016 2017 2018) and the audio unit.

4. Open wire check (RR CAMERA ACC DIODE/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 unit connector A (24P) disconnected
   Test point 1	Audio unit connector A (24P) No. 24 - Refer to: Audio Unit Connector for Inputs and Outputs [Display Audio Type (8-inch Screen)] (2016 2017 2018) or Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2016 2017) or Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2018) or
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The RR CAMERA ACC DIODE/ACC wire is OK. Go to step 6.

   NO 

   Repair an open in the wire between the No. C40 fuse - Refer to:

   Fuse to Components Index (With Auto Idle Stop System) (2016 2017 2018) or

   Fuse to Components Index (Without Auto Idle Stop System) (2016 2017 2018) the diode, and the audio unit.

5. 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 unit connector A (24P) disconnected
   Test point 1	Audio unit connector A (24P) No. 24 - Refer to: Audio Unit Connector for Inputs and Outputs [Display Audio Type (8-inch Screen)] (2016 2017 2018) or Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2016 2017) or Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2018) .
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The ACC wire is OK. Go to step 6.

   NO 

   Repair an open in the wire between the No. C40 fuse - Refer to:

   Fuse to Components Index (With Auto Idle Stop System) (2016 2017 2018) or

   Fuse to Components Index (Without Auto Idle Stop System) (2016 2017 2018) and the audio unit.

6. 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 unit connector A (24P) disconnected
   Test point 1	Audio unit connector A (24P) No. 1 - Refer to: Audio Unit Connector for Inputs and Outputs [Display Audio Type (8-inch Screen)] (2016 2017 2018) or Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2016 2017) or Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2018) .
   Test point 2	Body ground

   Is there continuity?

   YES 

   The GND wire is OK. Go to step 7.

   NO 

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

7. Audio unit check

   -1. Substitute a known-good audio panel. Refer to:

   Audio Unit Removal and Installation [Display Audio Type (8-inch Screen)] (2016 2017 2018) or

   Audio Unit Removal and Installation [Color Audio Type (5-inch Screen)] .

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

   Does the symptom go away?

   YES 

   Replace the original audio panel.

   NO 

   Replace the audio unit - Refer to:

   Audio Unit Removal and Installation [Display Audio Type (8-inch Screen)] (2016 2017 2018) or

   Audio Unit Removal and Installation [Color Audio Type (5-inch Screen)] .