Toyota Avalon (XX50): Microphone Circuit

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Audio / Video / Audio And Visual 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/ 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

GO TO STEP 19

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.

Result	Proceed to
NG (w/o Manual (SOS) Switch)	A
NG (w/ Manual (SOS) Switch)	B
OK	C

GO TO STEP 9

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

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.

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)

GO TO STEP 8

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.

(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	Turn the engine switch on (ACC). 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.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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.

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

Component without harness connected

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

Component without harness connected

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

REPLACE TELEPHONE MICROPHONE ASSEMBLY

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.

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

Component without harness connected

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

Component without harness connected

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

REPLACE TELEPHONE MICROPHONE ASSEMBLY

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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)

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

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

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 (ACC)	4 to 6 V

*a	Component with harness connected (DCM (Telematics Transceiver))

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

REPLACE DCM (TELEMATICS TRANSCEIVER)

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.

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)

GO TO STEP 18

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.

(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	Turn the engine switch on (ACC). 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.

GO TO STEP 17

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.

(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	Turn the engine switch on (ACC). 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.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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.

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

Component without harness connected

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

Component without harness connected

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

REPLACE TELEPHONE MICROPHONE ASSEMBLY

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.

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

Component without harness connected

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

Component without harness connected

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

REPLACE TELEPHONE MICROPHONE ASSEMBLY

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

19.	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.

Result	Proceed to
NG (w/o Manual (SOS) Switch)	A
NG (w/ Manual (SOS) Switch)	B
OK	C

GO TO STEP 26

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

20.	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.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G2-25 (SNS2) - O9-3 (SNS2)	Always	Below 1 Ω
G2-23 (MACC) - O9-6 (MACC)	Always	Below 1 Ω
G2-21 (MIN+) - O9-5 (MCO+)	Always	Below 1 Ω
G2-22 (MIN-) - O9-4 (MCO-)	Always	Below 1 Ω
G2-25 (SNS2) or O9-3 (SNS2) - Body ground	Always	10 kΩ or higher
G2-23 (MACC) or O9-6 (MACC) - Body ground	Always	10 kΩ or higher
G2-21 (MIN+) or O9-5 (MCO+) - Body ground	Always	10 kΩ or higher
G2-22 (MIN-) or O9-4 (MCO-) - Body ground	Always	10 kΩ or higher
G2-24 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

21.	INSPECT 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.

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

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

22.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here

(b) Connect the B telephone microphone assembly connector.

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)

GO TO STEP 25

23.	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 O9 roof console box sub-assembly connector.

(d) 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)

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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

24.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here

(b) Disconnect the B telephone microphone assembly connector.

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

Component without harness connected

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

Component without harness connected

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

REPLACE TELEPHONE MICROPHONE ASSEMBLY

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

25.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here

(b) Disconnect the B telephone microphone assembly connector.

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

Component without harness connected

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

Component without harness connected

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

REPLACE TELEPHONE MICROPHONE ASSEMBLY

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

26.	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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

27.	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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

28.	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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

29.	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)

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

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

30.	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))

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

REPLACE DCM (TELEMATICS TRANSCEIVER)

31.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here

(b) Connect the B telephone microphone assembly connector.

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)

GO TO STEP 35

32.	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.

(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	Turn the engine switch on (ACC). 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.

GO TO STEP 34

33.	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.

(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	Turn the engine switch on (ACC). 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.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE DCM (TELEMATICS TRANSCEIVER)

34.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here

(b) Disconnect the B telephone microphone assembly connector.

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

Component without harness connected

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

Component without harness connected

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

REPLACE TELEPHONE MICROPHONE ASSEMBLY

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

35.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here

(b) Disconnect the B telephone microphone assembly connector.

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

Component without harness connected

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

Component without harness connected

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

REPLACE TELEPHONE MICROPHONE ASSEMBLY

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

How To Proceed With Troubleshooting. Illumination Circuit. Illumination for Panel Switch does not Come on with Tail Switch ON

Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier. Mute Signal Circuit between Radio Receiver and Telematics Transceiver. Mute Signal Circuit between Stereo Component Amplifier

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sliding Roof / Convertible: Sliding Roof System(for Gasoline Model)
Sensor (Motor) Failure (B2341,B2344) DESCRIPTION When the sliding roof ECU (sliding roof drive gear assembly) detects a motor malfunction and the sliding roof operation is stopped, DTC B2341 is stored. When the sliding roof ECU (sliding roof drive gear assembly) detects a gear position malfunction a ...