AUDIO REMOTE SWITCH DOES NOT WORK PROPERLY (Audio-Navigation Unit Buttons Work) (With Navigation) (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. Turn on the audio-navigation unit and check the audio remote switch operation.

   Is the audio-navigation unit operation OK?

   YES 

   Intermittent failure, the system is OK at this time.

   NO 

   The failure is duplicated, go to step 2.

2. Audio remote switch check

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

   - 2. Do the Audio Remote Switch Test. Refer to: Audio Remote Switch Test (2016 2017 2018)

   Is the audio remote switch OK?

   YES 

   Go to step 3.

   NO 

   Replace the audio remote switch: Audio Remote Switch Removal and Installation (2016 2017 2018) .

3. Wire check (AUDIO REM, AUDIO REM GND lines)

   -1. Disconnect the following connector.

   Audio-navigation unit connector A (24P)

   - 2. Reconnect the audio remote switch 12P connector, and measure the resistance between test points 1 and 2 as specified in the table.

   Test condition	Vehicle OFF (LOCK) mode
   	Audio-navigation unit connector A (24P) disconnected
   Test point 1	Audio-navigation unit connector A (24P) No. 11 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2016) or Audio-Navigation Unit Connector for Inputs and Outputs (2017 2018) .
   Test point 2	Audio-navigation unit connector A (24P) No. 22 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2016) or Audio-Navigation Unit Connector for Inputs and Outputs (2017 2018) .

   Button held down	VOL DOWN (-)	VOL UP(+)	LEFT	RIGHT	SOURCE	No button pressed
   Resistance	About 99 Ω	About 357 Ω	About 775 Ω	About 1.7 kΩ	About 3.7 kΩ	About 10 kΩ

   Is the resistance OK?

   YES 

   Go to step 4.

   NO 

   Repair an open or a short in the wire(s) between the audio-navigation unit, the cable reel, and the audio remote switch. If the wire is OK, replace the cable reel. Refer to:

   Cable Reel Removal and Installation .

4. Wire check (AUDIO INFO SW line)

   -1. Measure the resistance between test points 1 and 2 as specified in the table.

   Test condition	Vehicle OFF (LOCK) mode
   	Audio-navigation unit connector A (24P) disconnected
   Test point 1	Audio-navigation unit connector A (24P) No. 11 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2016) or Audio-Navigation Unit Connector for Inputs and Outputs (2017 2018) .
   Test point 2	Audio-navigation unit connector A (24P) No. 23 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2016) or Audio-Navigation Unit Connector for Inputs and Outputs (2017 2018) .

   Button held down	MENU	DISP	No button pressed
   Resistance	About 33 Ω	About 363 Ω	No continuity

   Is the resistance OK?

   YES 

   Go to step 5.

   NO 

   Repair an open or a short in the wire between the audio-navigation unit, the cable reel, and the audio remote switch. If the wire is OK, replace the cable reel. Refer to:

   Cable Reel Removal and Installation .

5. Shorted wire check (AUDIO REM line to AUDIO INFO SW line)

   -1. Disconnect the following connector.

   Audio remote switch 12P connector

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

   Test condition

   Vehicle OFF (LOCK) mode

   	Audio-navigation unit connector A (24P) disconnected
   	Audio remote switch 12P connector: disconnected
   Test point 1	Audio-navigation unit connector A (24P) No. 22 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2016) or Audio-Navigation Unit Connector for Inputs and Outputs (2017 2018) .
   Test point 2	Audio-navigation unit connector A (24P) No. 23 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2016) or Audio-Navigation Unit Connector for Inputs and Outputs (2017 2018) .

   Is there continuity?

   YES 

   Repair a short in the wires between the audio-navigation unit, the cable reel, and the audio remote switch. If the wires are OK, replace the cable reel. Refer to:

   Cable Reel Removal and Installation .

   NO 

   The AUDIO REM wire to AUDIO INFO SW wire are not shorted. Go to step 6.

6. Shorted wire check (AUDIO REM line to AUDIO INFO SW line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio-navigation unit connector A (24P) disconnected
   	Audio remote switch 12P connector: disconnected
   Test circuit 1
   Test point 1	Audio-navigation unit connector A (24P) No. 22 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2016) or Audio-Navigation Unit Connector for Inputs and Outputs (2017 2018) .
   Test point 2	Body ground

   Test circuit 2
   Test point 1	Audio-navigation unit connector A (24P) No. 23 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2016) or Audio-Navigation Unit Connector for Inputs and Outputs (2017 2018) .
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to body ground in the wire(s) between the audio-navigation unit, the cable reel, and the audio remote switch. If the wires are OK, replace the cable reel. Refer to:

   Cable Reel Removal and Installation .

   NO 

   Audio-Navigation Unit Removal and Installation (2016 2017 2018) .