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

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Navigation / Multi Info Display / Navigation System(for Gasoline Model) / Microphone Circuit

DESCRIPTION

  • w/o Manual (SOS) Switch:

    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.

    Using this circuit, the radio and display receiver assembly sends power to the roof console box sub-assembly and telephone microphone assembly, and the roof console box sub-assembly and telephone microphone assembly sends microphone signals to the radio and display receiver assembly.

  • w/ Manual (SOS) Switch:

    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.

    Using this circuit, the DCM (telematics transceiver) sends power to the roof console box sub-assembly and telephone microphone assembly, and the roof console box sub-assembly and telephone microphone assembly sends microphone signals to the radio and display receiver assembly via the DCM (telematics transceiver).

WIRING DIAGRAM

w/o Manual (SOS) Switch w/ Manual (SOS) Switch

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.

CHECK MICROPHONE AND VOICE RECOGNITION (INPUT TO NAVIGATION ECU)

(a) Enter the "Microphone Check" screen. Refer to Check Microphone (Input to navigation ECU) in Operation Check.

Click here

(b) When voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

OK:

Check result is normal.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK MICROPHONE AND VOICE RECOGNITION (INPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Enter the "Microphone Check" screen. Refer to Check Microphone (Input to radio and display receiver assembly) in Operation Check.

Click here

(b) When voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

OK:

Check result is normal.

Result

Proceed to

NG (w/o Manual (SOS) Switch)

A

NG (w/ Manual (SOS) Switch)

B

OK

C
B

GO TO STEP 9

C

GO TO STEP 19

A

3.

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

G2-23 (MACC) - O10-9 (MACC)

Always

Below 1 Ω

G2-21 (MIN+) - O10-8 (MCO+)

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

G2-23 (MACC) or O10-9 (MACC) - Body ground

Always

10 kΩ or higher

G2-21 (MIN+) or O10-8 (MCO+) - Body ground

Always

10 kΩ or higher

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

Always

10 kΩ or higher

G2-24 (SGND) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

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

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

G2-23 (MACC) - Body ground

Engine switch on (ACC)

4 to 6 V

*a

Component with harness connected

(Radio and Display Receiver Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G2-24 (SGND) - Body ground

Always

Below 1 Ω

G2-22 (MIN-) - Body ground

Always

Below 1 Ω
NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

5.

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)
NG

GO TO STEP 8

OK

6.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

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

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

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

(d) Connect an oscilloscope to terminals 8 (MCO+) and 7 (MCO-) of the O10 roof console box sub-assembly connector.

*a

Component with harness connected

(Roof Console Box Sub-assembly)

(e) Check the signal waveform according to the condition(s) in the table below.

Item

Condition

Measurement terminal

O10-8 (MCO+) - O10-7 (MCO-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition
  1. Turn the engine switch on (ACC).
  2. Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-assembly sound holes.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

7.

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

O10-8 (MCO+) - B-3

Always

Below 1 Ω

O10-7 (MCO-) - B-2

Always

Below 1 Ω

O10-8 (MCO+) or B-3 - O10-15 (GND)

Always

10 kΩ or higher

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

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

O10-6 (SNS2) - B-1

Always

Below 1 Ω

O10-7 (MCO-) - B-2

Always

Below 1 Ω

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

Always

10 kΩ or higher

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

9.

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

10.

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

G2-21 (MIN+) - G9-18 (MCO+)

Always

Below 1 Ω

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

Always

Below 1 Ω

G2-21 (MIN+) or G9-18 (MCO+) - Body ground

Always

10 kΩ or higher

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

Always

10 kΩ or higher

G2-24 (SGND) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

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

G9-33 (MCVD) - O10-9 (MACC)

Always

Below 1 Ω

G9-34 (MCI+) - O10-8 (MCO+)

Always

Below 1 Ω

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

Always

Below 1 Ω

G9-33 (MCVD) or O10-9 (MACC) - Body ground

Always

10 kΩ or higher

G9-34 (MCI+) or O10-8 (MCO+) - Body ground

Always

10 kΩ or higher

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

Always

10 kΩ or higher

G9-32 (SGND) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

12.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

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

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

*a

Component with harness connected

(Radio and Display Receiver Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G2-24 (SGND) - Body ground

Always

Below 1 Ω

G2-22 (MIN-) - Body ground

Always

Below 1 Ω
NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

13.

INSPECT DCM (TELEMATICS TRANSCEIVER)

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

G9-33 (MCVD) - Body ground

Engine switch on (ACC)

4 to 6 V

*a

Component with harness connected

(DCM (Telematics Transceiver))

(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

G9-32 (SGND) - Body ground

Always

Below 1 Ω
NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

OK

14.

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)
NG

GO TO STEP 18

OK

15.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (OUTPUT TO DCM (TELEMATICS TRANSCEIVER))

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

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

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

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

(e) Connect an oscilloscope to terminals 8 (MCO+) and 7 (MCO-) of the O10 roof console box sub-assembly connector.

*a

Component with harness connected

(Roof Console Box Sub-assembly)

(f) Check the signal waveform according to the condition(s) in the table below.

Item

Condition

Measurement terminal

O10-8 (MCO+) - O10-7 (MCO-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition
  1. Turn the engine switch on (ACC).
  2. Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-assembly sound holes.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

NG

GO TO STEP 17

OK

16.

INSPECT DCM (TELEMATICS TRANSCEIVER) (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

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

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

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

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

(e) Connect an oscilloscope to terminals 18 (MCO+) and 19 (MCO-) of the G9 DCM (telematics transceiver) connector.

*a

Component with harness connected

DCM (Telematics Transceiver)

(f) Check the signal waveform according to the condition(s) in the table below.

Item

Condition

Measurement terminal

G9-18 (MCO+) - G9-19 (MCO-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition
  1. Turn the engine switch on (ACC).
  2. Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-assembly sound holes.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

17.

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

O10-8 (MCO+) - B-3

Always

Below 1 Ω

O10-7 (MCO-) - B-2

Always

Below 1 Ω

O10-8 (MCO+) or B-3 - O10-15 (GND)

Always

10 kΩ or higher

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

18.

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

O10-6 (SNS2) - B-1

Always

Below 1 Ω

O10-7 (MCO-) - B-2

Always

Below 1 Ω

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

Always

10 kΩ or higher

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

19.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)

(a) Disconnect the G1 radio and display receiver assembly connector.

(b) Disconnect the G13 navigation ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G1-25 (MCO+) - G13-13 (MIC+)

Always

Below 1 Ω

G1-26 (MCO-) - G13-14 (MIC-)

Always

Below 1 Ω

G1-25 (MCO+) or G13-13 (MIC+) - Body ground

Always

10 kΩ or higher

G1-26 (MCO-) or G13-14 (MIC-) - Body ground

Always

10 kΩ or higher

G1-24 (SGND) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

20.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (OUTPUT TO NAVIGATION ECU)

(a) Disconnect the G13 navigation ECU connector.

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

(c) Check the signal waveform according to the condition(s) in the table below.

Item

Condition

Measurement terminal

G13-13 (MIC+) - G13-14 (MIC-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition
  1. Turn the engine switch on (ACC).
  2. Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-assembly sound holes.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

*a

Front view of wire harness connector

(to Navigation ECU)
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Illumination for Panel Switch does not Come on with Tail Switch ON

    Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

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