USB Audio System Recognition/Play Error [08/2015 - 08/2021]: Procedure

1. Disconnect the USB device or "iPod" from the No. 1 stereo jack adapter assembly.
2. Check if playable files are present on the USB device or "iPod".

   HINT: 

   Refer to System Description for playable files (Refer to SYSTEM DESCRIPTION [08/2015 - 08/2019] , or refer to SYSTEM DESCRIPTION [08/2019 - 08/2021] ).

3. Check if the USB device is a compatible format or "iPod" is a compatible version.

   HINT: 

   Refer to System Description for compatible formats and versions (Refer to SYSTEM DESCRIPTION [08/2015 - 08/2019] , or refer to SYSTEM DESCRIPTION [08/2019 - 08/2021] ).

   RESULT
   
   

   Result	Proceed to
   No playable files exist, or incompatible device format or version.	A
   Playable files exist, and compatible device format or version.	B

Result: 

A 

USB DEVICE FORMAT WAS INCOMPATIBLE, "iPod" VERSION WAS INCOMPATIBLE, OR NO PLAYABLE FILES PRESENT 

Result: 

B 

See step  2

1. Disconnect the H9 multi-media module receiver assembly connector.
2. Disconnect the H31 No. 1 stereo jack adapter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H9-1 (USV1) - H31-1 (UPI)	Always	Below 1 Ω
   H9-2 (US1-) - H31-2 (UDO-)	Always	Below 1 Ω
   H9-3 (US1+) - H31-3 (UDO+)	Always	Below 1 Ω
   H9-4 (UGD1) - H31-4 (UJSG)	Always	Below 1 Ω
   H9-5 (UGS1) - H31-5 (UJSS)	Always	Below 1 Ω
   H9-1 (USV1) - Body ground	Always	10 kΩ or higher
   H9-2 (US1-) - Body ground	Always	10 kΩ or higher
   H9-3 (US1+) - Body ground	Always	10 kΩ or higher
   H9-4 (UGD1) - Body ground	Always	10 kΩ or higher
   H9-5 (USG1) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Reconnect the multi-media module receiver assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   H31-1 (UPI) - H31-4 (UJSG)	Engine switch on (ACC)	4.5 to 5.5 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to No. 1 Stereo Jack Adapter Assembly)

Result: 

NG 

REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2021] )

Result: 

OK 

See step  4

1. Delete all files in the USB device or "iPod" and format/restore it.
2. Save the data again and check if it can be played on the in-vehicle device.
   NOTE:

   Formatting a USB device or restoring an "iPod" erases all music on the device.

   Ensure that backup music data is available before performing this operation.

   OK

   Malfunction disappears.

Result: 

OK 

END (USB OR "iPod" IS DEFECTIVE) 

Result: 

NG 

See step  5

1. Turn the engine switch off.

   HINT: 

   When this malfunction occurs, it is necessary to turn off the engine switch to make it possible for the vehicle to recognize a new device when it is connected.

2. Turn the engine switch on (ACC).
3. Connect a known good USB device or "iPod" to the No. 1 stereo jack adapter assembly.

   HINT: 

   • If the malfunction occurred when a USB device was in use, use another USB device for the inspection. If the malfunction occurred when an "iPod" was in use, use another "iPod" for the inspection.
   • Refer to System Description for compatible formats and versions (Refer to SYSTEM DESCRIPTION [08/2015 - 08/2019] , or refer to SYSTEM DESCRIPTION [08/2019 - 08/2021] ).

Result: 

NEXT 

See step  6

1. Check if the USB device or "iPod" is recognized by the multi-media module receiver assembly, or if information such as track, artist and album names are displayed on the screen.

   OK

   USB device or "iPod" is recognized or track information such as track, artist and album names are displayed.

Result: 

OK 

USB DEVICE OR "iPod" WAS INCOMPATIBLE OR DEFECTIVE 

Result: 

NG 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [08/2015 - 08/2019] , or refer to PROBLEM SYMPTOMS TABLE [08/2019 - 08/2021] )