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

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Audio / Video / Audio And Visual System(for Hv Model) / Microphone Circuit

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.

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/ Sliding Roof w/o Sliding Roof

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 Audio and Visual 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 MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ Sliding Roof

A

w/o Sliding Roof

B
B

GO TO STEP 13

A

2.

CHECK MICROPHONE (OPERATION CHECK)

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

Click here

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

OK:

Check result is normal.

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

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

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

G2-21 (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

5.

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

6.

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

7.

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

Power 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

8.

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 12

OK

9.

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 power 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 power 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 11

OK

10.

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 power 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 power 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)

11.

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

12.

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

13.

CHECK MICROPHONE (OPERATION CHECK)

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

Click here

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

OK:

Check result is normal.

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

14.

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 O9 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) - O9-3 (SNS2)

Always

Below 1 Ω

G2-25 (SNS2) or O9-3 (SNS2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

15.

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

16.

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

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

(b) Disconnect the O9 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) - O9-6 (MACC)

Always

Below 1 Ω

G9-34 (MCI+) - O9-5 (MCO+)

Always

Below 1 Ω

G9-35 (MCI-) - O9-4 (MCO-)

Always

Below 1 Ω

G9-33 (MCVD) or O9-6 (MACC) - Body ground

Always

10 kΩ or higher

G9-34 (MCI+) or O9-5 (MCO+) - Body ground

Always

10 kΩ or higher

G9-35 (MCI-) or O9-4 (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

17.

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

18.

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

Power 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

19.

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

3 (SNS2) - 4 (MCO-)

Always

Below 1 Ω

*a

Component without harness connected

(Roof Console Box Sub-assembly)
NG

GO TO STEP 23

OK

20.

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

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

(b) Connect the O9 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 5 (MCO+) and 4 (MCO-) of the O9 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

O9-5 (MCO+) - O9-4 (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 22

OK

21.

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

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

(b) Connect the O9 roof console box sub-assembly connector.

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

(d) Turn the power 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 power 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)

22.

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

O9-5 (MCO+) - B-3

Always

Below 1 Ω

O9-4 (MCO-) - B-2

Always

Below 1 Ω

O9-5 (MCO+) or B-3 - O9-11 (GND)

Always

10 kΩ or higher

O9-4 (MCO-) or B-2 - O9-11 (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

23.

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

O9-3 (SNS2) - B-1

Always

Below 1 Ω

O9-4 (MCO-) - B-2

Always

Below 1 Ω

O9-3 (SNS2) or B-1 - O9-11 (GND)

Always

10 kΩ or higher

O9-4 (MCO-) or B-2 - O9-11 (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

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    Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

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