- 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.
| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001SDYC |
| Model Year Start: 2021 | Model: Avalon | Prod Date Range: [08/2020 - ] |
| Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Gasoline Model): Microphone Circuit; 2021 - 2022 MY Avalon [08/2020 - ] | ||
|
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
![2019 - 2021 MY Avalon [04/2018 - 08/2021]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Gasoline Model): PRECAUTION](/t3Portal/stylegraphics/info.gif)
-
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 |
|
|
|
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.
| 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 |
|
|
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 G124 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+) - G124-16 (MCO+) |
Always |
Below 1 Ω |
|
G2-22 (MIN-) - G124-32 (MCO-) |
Always |
Below 1 Ω |
|
G2-21 (MIN+) or G124-16 (MCO+) - Body ground |
Always |
10 kΩ or higher |
|
G2-22 (MIN-) or G124-32 (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 |
|
|
5. |
CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - ROOF CONSOLE BOX SUB-ASSEMBLY) |
(a) Disconnect the G124 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 |
|---|---|---|
|
G124-5 (MCVD) - O10-9 (MACC) |
Always |
Below 1 Ω |
|
G124-6 (MCI+) - O10-8 (MCO+) |
Always |
Below 1 Ω |
|
G124-7 (MCI-) - O10-7 (MCO-) |
Always |
Below 1 Ω |
|
G124-5 (MCVD) or O10-9 (MACC) - Body ground |
Always |
10 kΩ or higher |
|
G124-6 (MCI+) or O10-8 (MCO+) - Body ground |
Always |
10 kΩ or higher |
|
G124-7 (MCI-) or O10-7 (MCO-) - Body ground |
Always |
10 kΩ or higher |
|
G124-23 (SGND) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
6. |
INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY |
(a) Disconnect the G124 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 |
|---|---|---|
|
G2-24 (SGND) - Body ground |
Always |
Below 1 Ω |
|
G2-22 (MIN-) - Body ground |
Always |
Below 1 Ω |
| NG |
|
|
|
7. |
INSPECT DCM (TELEMATICS TRANSCEIVER) |
(a) Connect the G124 DCM (telematics transceiver) connector.
|
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G124-7 (MCI-) - Body ground |
Always |
Below 1 Ω |
|
G124-23 (SGND) - Body ground |
Always |
Below 1 Ω |
| NG |
|
|
|
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:
|
|
| NG |
|
|
|
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 G124 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. |
|
(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 |
|
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 |
|
|
|
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 G124 DCM (telematics transceiver) connector.
(d) Turn the power switch on (ACC).
|
(e) Connect an oscilloscope to terminals 16 (MCO+) and 32 (MCO-) of the G124 DCM (telematics transceiver) connector. |
|
(f) Check the signal waveform according to the condition(s) in the table below.
|
Item |
Condition |
|---|---|
|
Measurement terminal |
G124-16 (MCO+) - G124-32 (MCO-) |
|
Tool setting |
50 mV/DIV., 500 ms/DIV. |
|
Vehicle condition |
|
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 |
|
|
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:
|
|
| OK |
|
| NG |
|
|
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:
|
|
| OK |
|
| NG |
|
|
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.
| 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 |
|
|
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 G124 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+) - G124-16 (MCO+) |
Always |
Below 1 Ω |
|
G2-22 (MIN-) - G124-32 (MCO-) |
Always |
Below 1 Ω |
|
G2-21 (MIN+) or G124-16 (MCO+) - Body ground |
Always |
10 kΩ or higher |
|
G2-22 (MIN-) or G124-32 (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 |
|
|
16. |
CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - ROOF CONSOLE BOX SUB-ASSEMBLY) |
(a) Disconnect the G124 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 |
|---|---|---|
|
G124-5 (MCVD) - O9-6 (MACC) |
Always |
Below 1 Ω |
|
G124-6 (MCI+) - O9-5 (MCO+) |
Always |
Below 1 Ω |
|
G124-7 (MCI-) - O9-4 (MCO-) |
Always |
Below 1 Ω |
|
G124-5 (MCVD) or O9-6 (MACC) - Body ground |
Always |
10 kΩ or higher |
|
G124-6 (MCI+) or O9-5 (MCO+) - Body ground |
Always |
10 kΩ or higher |
|
G124-7 (MCI-) or O9-4 (MCO-) - Body ground |
Always |
10 kΩ or higher |
|
G124-23 (SGND) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
17. |
INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY |
(a) Disconnect the G124 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 |
|---|---|---|
|
G2-24 (SGND) - Body ground |
Always |
Below 1 Ω |
|
G2-22 (MIN-) - Body ground |
Always |
Below 1 Ω |
| NG |
|
|
|
18. |
INSPECT DCM (TELEMATICS TRANSCEIVER) |
(a) Connect the G124 DCM (telematics transceiver) connector.
|
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G124-7 (MCI-) - Body ground |
Always |
Below 1 Ω |
|
G124-23 (SGND) - Body ground |
Always |
Below 1 Ω |
| NG |
|
|
|
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:
|
|
| NG |
|
|
|
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 G124 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. |
|
(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 |
|
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 |
|
|
|
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 G124 DCM (telematics transceiver) connector.
(d) Turn the engine switch on (ACC).
|
(e) Connect an oscilloscope to terminals 16 (MCO+) and 32 (MCO-) of the G124 DCM (telematics transceiver) connector. |
|
(f) Check the signal waveform according to the condition(s) in the table below.
|
Item |
Condition |
|---|---|
|
Measurement terminal |
G124-16 (MCO+) - G124-32 (MCO-) |
|
Tool setting |
50 mV/DIV., 500 ms/DIV. |
|
Vehicle condition |
|
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 |
|
|
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:
|
|
| OK |
|
| NG |
|
|
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:
|
|
| OK |
|
| NG |
|
|
|