REAR ENTERTAINMENT SYSTEM SYMPTOM TROUBLESHOOTING - HDMI DEVICE DOES NOT FUNCTION (Without Navigation) (2016 2017 2018)

NOTE: 

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

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

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

• Check the HDMI port for dirt or damage.

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   - 2. Connect a known-good HDMI device to the HDMI port.

   - 3. Check if a image is displayed on the rear display and a audio sound is normal.

   Does the rear display operate properly and does the audio sound normal?

   YES 

   Intermittent failure, the system is OK at this time.

   NO: No sound

   The failure is duplicated, Go to step 2.

   NO: No image

   Replace the rear controller and screen. Rear Controller and Screen Removal and Installation (2016 2017 2018) .

   NO: No image and no sound

   Replace the HDMI harness, and recheck. If the symptom does not go away, replace the rear controller and screen..

   Rear Controller and Screen Removal and Installation (2016 2017 2018)

2. Shorted wire check (RES AUDIO L SIG, RES AUDIO R SIG lines)

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

   - 2. Disconnect the following connectors.

   Rear controller and screen connector A (24P)

   Audio unit connector H (24P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio unit connector H (24P) disconnected
   	Rear controller and screen connector A (24P) disconnected
   Test circuit 1
   Test point 1	Audio unit connector H (24P) No. 20 - Refer to: Audio Unit Connector for Inputs and Outputs [Display Audio Type (8-inch Screen)] (2016 2017 2018)  Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2016 2017)  Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2018)
   Test point 2	Body ground

   Test circuit 2
   Test point 1	Audio unit connector H (24P) No. 21 - Refer to: Audio Unit Connector for Inputs and Outputs [Display Audio Type (8-inch Screen)] (2016 2017 2018)  Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2016 2017)  Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2018)
   Test point 2	Body ground

   Is there continuity?

   YES 

   There is a short to body ground in the wire(s) between the audio unit and the rear controller and screen. Replace the affected shielded harness.

   NO 

   The RES AUDIO L SIG and RES AUDIO R SIG wires are not shorted. Go to step 3.

3. Shorted wire check (RES AUDIO lines)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio unit connector H (24P) disconnected
   	Rear controller and screen connector A (24P) disconnected

   Test point 1  Audio unit connector H (24P) - Refer to:  Audio Unit Connector for Inputs and Outputs [Display Audio Type (8-inch Screen)] (2016 2017 2018)  Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2016 2017)  Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2018)	Test points 2  Audio unit connector H (24P) - Refer to:  Audio Unit Connector for Inputs and Outputs [Display Audio Type (8-inch Screen)] (2016 2017 2018)  Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2016 2017)  Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2018)
   No. 20	No. 8, No. 9, No. 21
   No. 21	No. 8, No. 9

   Is there continuity between any of the terminals?

   YES 

   There is a short in the wires between the audio unit and the rear controller and screen. Replace the affected shielded harness.

   NO 

   The RES AUDIO wires are not shorted. Go to step 4.

4. Open wire check (RES AUDIO L SIG, RES AUDIO R SIG, RES AUDIO L/R GND lines)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio unit connector H (24P) disconnected

   Rear controller and screen connector A (24P) disconnected

   Test point 1:  Audio unit connector H (24P) - Refer to: Audio Unit Connector for Inputs and Outputs [Display Audio Type (8-inch Screen)] (2016 2017 2018)  Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2016 2017)  Audio Unit Connector for Inputs and Outputs [Color Audio Type (5-inch Screen)] (2018)	Test point 2:  Rear controller and screen connector A (24P)
   No. 8	No. 5
   No. 20	No. 16
   No. 21	No. 4

   Is there continuity

   YES 

   The RES AUDIO L SIG, RES AUDIO R SIG, and RES AUDIO L/R GND wires are OK. Go to step 5.

   NO 

   There is an open in the wire(s) between the audio unit and the rear controller and screen. Replace the affected shielded harness.

5. Rear controller and screen check (substitution)

   -1. Substitute a known-good rear controller and screen.

   Rear Controller And Screen Removal And Installation (2016 2017 2018)

   - 2. Reconnect all the connectors, and recheck.

   Does the symptom go away?

   YES 

   Replace the original rear controller and screen.

   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]) .