Lexus NX: USB Audio System Recognition/Play Error

DESCRIPTION

When a USB device or "iPod" is connected to the USB jack of the No. 1 stereo jack adapter assembly, it must have playable files. The device must also communicate with and be recognized by the radio receiver assembly. This diagnosis procedure is for when a device is not recognized, or files from the device cannot be played normally.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the radio receiver assembly, always replace it with a new one.

If a radio receiver assembly which was installed to another vehicle is used, the following may occur:

  • A communication malfunction DTC may be stored.
  • The radio receiver assembly may not operate normally.

HINT:

  • When a large amount of data is in a USB device, it may take a while to begin playback.
  • When using a USB device, files that are protected by copyright cannot be played.
  • When files are not played in the sorted order, perform the following procedure before inspection.
    1. Add numbers in front of the file names.
    2. Put the files in a folder and copy the folder data to the USB device.
  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

    Click here

PROCEDURE

1.

CHECK USB DEVICE OR "iPod"

(a) Disconnect the USB device or "iPod" from the No. 1 stereo jack adapter assembly.

(b) Check if playable files are present on the USB device or "iPod".

HINT:

Refer to System Description for playable files.

Click here

(c) 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.

Click here

Result

Proceed to

No playable files exist, or incompatible device format or version.

A

Playable files exist, and compatible device format or version.

B

A

END (USB DEVICE FORMAT IS INCOMPATIBLE, "iPod" VERSION IS INCOMPATIBLE, OR NO PLAYABLE FILES EXIST)

B

2.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NO. 1 STEREO JACK ADAPTER ASSEMBLY)

(a) Disconnect the I151 radio receiver assembly connector.

(b) Disconnect the I155 No. 1 stereo jack adapter assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I151-2 (GND2) - I155-3 (GND)

Always

Below 1 Ω

I151-3 (+B) - I155-4 (+B)

Always

Below 1 Ω

I151-16 (ACC) - I155-8 (ACC)

Always

Below 1 Ω

I151-2 (GND2) or I155-3 (GND) - Body ground

Always

10 kΩ or higher

I151-3 (+B) or I155-4 (+B) - Body ground

Always

10 kΩ or higher

I151-16 (ACC) or I155-8 (ACC) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NO. 1 STEREO JACK ADAPTER ASSEMBLY)

(a) Disconnect the I179 radio receiver assembly connector.

*a

Front view of wire harness connector

(to Radio Receiver Assembly)

*b

Front view of wire harness connector

(to No. 1 Stereo Jack Adapter Assembly)

(b) Disconnect the I166 No. 1 stereo jack adapter assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I179-1 (USV1) - I166-1 (UP1)

Always

Below 1 Ω

I179-2 (US1-) - I166-2 (UDO-)

Always

Below 1 Ω

I179-3 (US1+) - I166-3 (UDO+)

Always

Below 1 Ω

I179-4 (UGD1) - I166-4 (UJSG)

Always

Below 1 Ω

I179-5 (USG1) - I166-5 (UJSS)

Always

Below 1 Ω

I179-1 (USV1) or I166-1 (UP1) - Body ground

Always

10 kΩ or higher

I179-2 (US1-) or I166-2 (UDO-) - Body ground

Always

10 kΩ or higher

I179-3 (US1+) or I166-3 (UDO+) - Body ground

Always

10 kΩ or higher

I179-4 (UGD1) or I166-4 (UJSG) - Body ground

Always

10 kΩ or higher

I179-5 (USG1) or I166-5 (UJSS) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK RADIO RECEIVER ASSEMBLY (NO. 1 STEREO JACK ADAPTER ASSEMBLY POWER SOURCE)

(a) Disconnect the I166 and I155 No. 1 stereo jack adapter assembly connectors.

*a

Front view of wire harness connector

(to No. 1 Stereo Jack Adapter Assembly)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

I166-1 (UP1) - I166-4 (UJSG)

Power switch on (ACC)

4.5 to 5.5 V

I155-8(ACC) - I155-3(GND)

Power switch on (ACC)

11 to 14 V

I155-4 (+B) - I155-3 (GND)

Power switch off

11 to 14 V

NG

REPLACE RADIO RECEIVER ASSEMBLY

OK

5.

FORMAT USB DEVICE OR RESTORE "iPod" AND RECHECK

(a) Delete all files in the USB device or "iPod" and format/restore it.

(b) Save the data again and check if it can be played on the in-vehicle device.

NOTICE:

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.

HINT:

Make sure to obtain the customer's permission to perform this procedure.

OK:

Malfunction disappears.

OK

END

NG

6.

REPLACE USB DEVICE OR "iPod"

(a) Turn the power switch off.

HINT:

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

(b) Turn the power switch on (ACC).

(c) 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.

    Click here

NEXT

7.

CHECK USB DEVICE OR "iPod"

(a) Check if a USB device or "iPod" is recognized by the radio receiver assembly, and if information such as track, artist and album names is displayed on the screen.

OK:

USB device or "iPod" is recognized properly and the information is displayed on the screen.

OK

USB DEVICE OR "iPod" WAS INCOMPATIBLE OR DEFECTIVE

NG

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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