Toyota Avalon (XX50): Voice Recognition Microphone Disconnected (B1579). USB Device Malfunction (B1585). Black Screen

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Navigation / Multi Info Display / Navigation System(for Gasoline Model) / Voice Recognition Microphone Disconnected (B1579). USB Device Malfunction (B1585). Black Screen

Voice Recognition Microphone Disconnected (B1579)

DESCRIPTION

The radio and display receiver assembly, roof console box sub-assembly and telephone microphone assembly are connected to each other using the microphone connection detection signal lines.

This DTC is stored when a microphone connection detection signal line is disconnected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1579

Voice Recognition Microphone Disconnected

Microphone signal is lost
  • Roof console box sub-assembly
  • Telephone microphone assembly
  • Radio and display receiver assembly
  • DCM (telematics transceiver)*
  • Harness or connector
  • *: w/ Manual (SOS) Switch

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • 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

  • When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
    • A communication malfunction DTC may be stored.
    • The radio and display receiver assembly may not operate normally.
  • Before replacing the DCM (telematics transceiver), refer to Registration.

    Click here

PROCEDURE

1.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G2-22 (MIN-) - Body ground

Always

Below 1 Ω

Result

Proceed to

OK (w/o Manual (SOS) Switch)

A

OK (w/ Manual (SOS) Switch)

B

NG

C

*a

Component with harness connected

(Radio and Display Receiver Assembly)
B

GO TO STEP 3

C

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

A

2.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Disconnect the G2 radio and display receiver assembly connector.

(b) Disconnect the O10 roof console box sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G2-25 (SNS2) - O10-6 (SNS2)

Always

Below 1 Ω

G2-22 (MIN-) - O10-7 (MCO-)

Always

Below 1 Ω

G2-25 (SNS2) or O10-6 (SNS2) - Body ground

Always

10 kΩ or higher

G2-22 (MIN-) or O10-7 (MCO-) - Body ground

Always

10 kΩ or higher
OK

GO TO STEP 7

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Disconnect the G9 DCM (telematics transceiver) connector.

(b) Disconnect the O10 roof console box sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G9-35 (MCI-) - O10-7 (MCO-)

Always

Below 1 Ω

G9-35 (MCI-) or O10-7 (MCO-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))

(a) Disconnect the G2 radio and display receiver assembly connector.

(b) Disconnect the G9 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G2-22 (MIN-) - G9-19 (MCO-)

Always

Below 1 Ω

G2-22 (MIN-) or G9-19 (MCO-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Disconnect the G2 radio and display receiver assembly connector.

(b) Disconnect the O10 roof console box sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G2-25 (SNS2) - O10-6 (SNS2)

Always

Below 1 Ω

G2-25 (SNS2) or O10-6 (SNS2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

INSPECT DCM (TELEMATICS TRANSCEIVER)

(a) Connect the G9 DCM (telematics transceiver) connector.

(b) Connect the G2 radio and display receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G9-35 (MCI-) - Body ground

Always

Below 1 Ω

*a

Component with harness connected

(DCM (Telematics Transceiver))
NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

OK

7.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

(a) Remove the roof console box sub-assembly.

Click here

(b) Connect the B telephone microphone assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

6 (SNS2) - 7 (MCO-)

Always

Below 1 Ω

*a

Component without harness connected

(Roof Console Box Sub-assembly)
OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

8.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

(a) Remove the roof console box sub-assembly.

Click here

(b) Disconnect the B telephone microphone assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B-1 - O10-6 (SNS2)

Always

Below 1 Ω

B-2 - O10-7 (MCO-)

Always

Below 1 Ω

B-1 or O10-6 (SNS2) - O10-15 (GND)

Always

10 kΩ or higher

B-2 or O10-7 (MCO-) - O10-15 (GND)

Always

10 kΩ or higher

*a

Component without harness connected

(Roof Console Box Sub-assembly (No. 1 Roof Wire Side))

*b

Component without harness connected

(Roof Console Box Sub-assembly (Telephone Microphone Assembly Side))
OK

REPLACE TELEPHONE MICROPHONE ASSEMBLY

NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

USB Device Malfunction (B1585)

DESCRIPTION

This DTC is stored when a malfunction occurs in a connected device.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1585

USB Device Malfunction

When any of the following conditions is met:

  • A non mass-storage class or incompatible protocol USB device connected
  • USB device with an incompatible file system, corrupted or incompatible File Allocation Table (FAT) connected
  • "iPod" malfunction
  • "iPod" with unsupported firmware connected
  • Unsupported "iPod" model connected
  • USB device or "iPod"
  • Radio and display receiver assembly

CAUTION / NOTICE / HINT

NOTICE:

  • 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

  • When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
    • A communication malfunction DTC may be stored.
    • The radio and display receiver assembly may not operate normally.

PROCEDURE

1.

REPLACE USB DEVICE OR "iPod"

(a) Disconnect the USB device or "iPod" from the stereo jack adapter assembly.

(b) Turn the engine switch off.

HINT:

When this DTC has been stored, it is necessary to turn the engine switch off to make it possible for the vehicle to recognize a new device when it is connected.

(c) Turn the engine switch on (ACC).

(d) Connect a known good USB device or "iPod" to the 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

2.

CHECK DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(b) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

END (USB DEVICE FORMAT WAS INCOMPATIBLE, "iPod" VERSION WAS INCOMPATIBLE, OR USB DEVICE OR "iPod" WAS DEFECTIVE)
NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

Black Screen

PROCEDURE

1.

CHECK DISPLAY SETTING

(a) Check that the display is not in screen off mode.

OK:

The display setting is not in screen off mode.

NG

CHANGE SCREEN TO SCREEN ON MODE
OK

2.

CHECK IMAGE QUALITY SETTING

(a) Check that the screen color quality can be set.

OK:

Setting is possible.

OK

SET SCREEN COLOR QUALITY TO NORMAL
NG

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual

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