- Turn the ignition switch to ACC.
- Sound is input to the map light assembly when the user is closer than 125 mm from the map light assembly sound holes.
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001KLW6 |
| Model Year Start: 2020 | Model: GR Corolla | Prod Date Range: [09/2019 - 04/2020] |
| Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Gasoline Model with Dual Knob Type): Microphone Circuit; 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020] | ||
|
Microphone Circuit |
DESCRIPTION
-
w/o Manual (SOS) Switch:
The radio and display receiver sub-assembly, map light 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 map light assembly and telephone microphone assembly, and the map light 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, map light 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 map light assembly and telephone microphone assembly, and the map light assembly and telephone microphone assembly sends microphone signals to the radio and display receiver assembly via the DCM (telematics transceiver).
WIRING DIAGRAM
for Hatchback Model
for Sedan Model
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
![2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Gasoline Model with Dual Knob Type): 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 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 (for Hatchback Model with Manual (SOS) Switch) |
B |
|
NG (for Sedan Model with Manual (SOS) Switch) |
C |
|
OK |
D |
| B |
|
| C |
|
| D |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) |
(a) Disconnect the I56 radio and display receiver assembly connector.
(b) Disconnect the T6 map light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I56-25 (SNS2) - T6-4 (SNS2) |
Always |
Below 1 Ω |
|
I56-23 (MACC) - T6-7 (MACC) |
Always |
Below 1 Ω |
|
I56-21 (MIN+) - T6-6 (MCO+) |
Always |
Below 1 Ω |
|
I56-22 (MIN-) - T6-5 (MCO-) |
Always |
Below 1 Ω |
|
I56-25 (SNS2) or T6-4 (SNS2) - Body ground |
Always |
10 kΩ or higher |
|
I56-23 (MACC) or T6-7 (MACC) - Body ground |
Always |
10 kΩ or higher |
|
I56-21 (MIN+) or T6-6 (MCO+) - Body ground |
Always |
10 kΩ or higher |
|
I56-22 (MIN-) or T6-5 (MCO-) - Body ground |
Always |
10 kΩ or higher |
|
I56-24 (SGND) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY |
(a) Connect the I56 radio and display receiver assembly connector.
(b) Connect the T6 map light assembly connector.
|
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I56-24 (SGND) - Body ground |
Always |
Below 1 Ω |
|
I56-22 (MIN-) - Body ground |
Always |
Below 1 Ω |
| NG |
|
|
|
4. |
INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light 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 |
|
|
|
5. |
INSPECT MAP LIGHT ASSEMBLY (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY) |
(a) Connect the I56 radio and display receiver assembly connector.
(b) Connect the T6 map light assembly connector.
(c) Turn the ignition switch to ACC.
|
(d) Connect an oscilloscope to terminals 6 (MCO+) and 5 (MCO-) of the T6 map light assembly connector. |
|
(e) Check the signal waveform according to the condition(s) in the table below.
|
Item |
Condition |
|---|---|
|
Measurement terminal |
T6-6 (MCO+) - T6-5 (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 |
|
|
6. |
INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light 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 |
|
|
7. |
INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light 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 |
|
|
8. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) |
(a) Disconnect the I56 radio and display receiver assembly connector.
(b) Disconnect the T6 map light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I56-25 (SNS2) - T6-4 (SNS2) |
Always |
Below 1 Ω |
|
I56-25 (SNS2) or T6-4 (SNS2) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
9. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) |
(a) Disconnect the I56 radio and display receiver assembly connector.
(b) Disconnect the I143 DCM (telematics transceiver) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I56-21 (MIN+) - I143-16 (MCO+) |
Always |
Below 1 Ω |
|
I56-22 (MIN-) - I143-32 (MCO-) |
Always |
Below 1 Ω |
|
I56-21 (MIN+) or I143-16 (MCO+) - Body ground |
Always |
10 kΩ or higher |
|
I56-22 (MIN-) or I143-32 (MCO-) - Body ground |
Always |
10 kΩ or higher |
|
I56-24 (SGND) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
10. |
CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY) |
(a) Disconnect the I143 DCM (telematics transceiver) connector.
(b) Disconnect the T6 map light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I143-5 (MCVD) - T6-7 (MACC) |
Always |
Below 1 Ω |
|
I143-6 (MCI+) - T6-6 (MCO+) |
Always |
Below 1 Ω |
|
I143-7 (MCI-) - T6-5 (MCO-) |
Always |
Below 1 Ω |
|
I143-5 (MCVD) or T6-7 (MACC) - Body ground |
Always |
10 kΩ or higher |
|
I143-6 (MCI+) or T6-6 (MCO+) - Body ground |
Always |
10 kΩ or higher |
|
I143-7 (MCI-) or T6-5 (MCO-) - Body ground |
Always |
10 kΩ or higher |
|
I143-23 (SGND) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
11. |
INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY |
(a) Disconnect the I72 DCM (telematics transceiver) connector.
|
(b) Connect the I56 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 |
|---|---|---|
|
I56-24 (SGND) - Body ground |
Always |
Below 1 Ω |
|
I56-22 (MIN-) - Body ground |
Always |
Below 1 Ω |
| NG |
|
|
|
12. |
INSPECT DCM (TELEMATICS TRANSCEIVER) |
(a) Connect the I143 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 |
|---|---|---|
|
I143-7 (MCI-) - Body ground |
Always |
Below 1 Ω |
|
I143-23 (SGND) - Body ground |
Always |
Below 1 Ω |
| NG |
|
|
|
13. |
INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light 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 |
|
|
|
14. |
INSPECT MAP LIGHT ASSEMBLY (OUTPUT TO DCM (TELEMATICS TRANSCEIVER)) |
(a) Connect the I56 radio and display receiver assembly connector.
(b) Connect the T6 map light assembly connector.
(c) Connect the I72 DCM (telematics transceiver) connector.
(d) Turn the ignition switch to ACC.
|
(e) Connect an oscilloscope to terminals 6 (MCO+) and 5 (MCO-) of the T6 map light assembly connector. |
|
(f) Check the signal waveform according to the condition(s) in the table below.
|
Item |
Condition |
|---|---|
|
Measurement terminal |
T6-6 (MCO+) - T6-5 (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 |
|
|
|
15. |
INSPECT DCM (TELEMATICS TRANSCEIVER) (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY) |
(a) Connect the I56 radio and display receiver assembly connector.
(b) Connect the T6 map light assembly connector.
(c) Connect the I143 DCM (telematics transceiver) connector.
(d) Turn the ignition switch to ACC.
|
(e) Connect an oscilloscope to terminals 16 (MCO+) and 32 (MCO-) of the I143 DCM (telematics transceiver) connector. |
|
(f) Check the signal waveform according to the condition(s) in the table below.
|
Item |
Condition |
|---|---|
|
Measurement terminal |
I143-16 (MCO+) - I143-32 (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 |
|
|
16. |
INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light 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 |
|
|
17. |
INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light 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 |
|
|
18. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) |
(a) Disconnect the I56 radio and display receiver assembly connector.
(b) Disconnect the T6 map light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I56-25 (SNS2) - T6-4 (SNS2) |
Always |
Below 1 Ω |
|
I56-25 (SNS2) or T6-4 (SNS2) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
19. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) |
(a) Disconnect the I56 radio and display receiver assembly connector.
(b) Disconnect the I72 DCM (telematics transceiver) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I56-21 (MIN+) - I72-18 (MCO+) |
Always |
Below 1 Ω |
|
I56-22 (MIN-) - I72-19 (MCO-) |
Always |
Below 1 Ω |
|
I56-21 (MIN+) or I72-18 (MCO+) - Body ground |
Always |
10 kΩ or higher |
|
I56-22 (MIN-) or I72-19 (MCO-) - Body ground |
Always |
10 kΩ or higher |
|
I56-24 (SGND) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
20. |
CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY) |
(a) Disconnect the I72 DCM (telematics transceiver) connector.
(b) Disconnect the T6 map light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I72-33 (MCVD) - T6-7 (MACC) |
Always |
Below 1 Ω |
|
I72-34 (MCI+) - T6-6 (MCO+) |
Always |
Below 1 Ω |
|
I72-35 (MCI-) - T6-5 (MCO-) |
Always |
Below 1 Ω |
|
I72-33 (MCVD) or T6-7 (MACC) - Body ground |
Always |
10 kΩ or higher |
|
I72-34 (MCI+) or T6-6 (MCO+) - Body ground |
Always |
10 kΩ or higher |
|
I72-35 (MCI-) or T6-5 (MCO-) - Body ground |
Always |
10 kΩ or higher |
|
I72-32 (SGND) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
21. |
INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY |
(a) Disconnect the I72 DCM (telematics transceiver) connector.
|
(b) Connect the I56 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 |
|---|---|---|
|
I56-24 (SGND) - Body ground |
Always |
Below 1 Ω |
|
I56-22 (MIN-) - Body ground |
Always |
Below 1 Ω |
| NG |
|
|
|
22. |
INSPECT DCM (TELEMATICS TRANSCEIVER) |
(a) Connect the I72 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 |
|---|---|---|
|
I72-35 (MCI-) - Body ground |
Always |
Below 1 Ω |
|
I72-32 (SGND) - Body ground |
Always |
Below 1 Ω |
| NG |
|
|
|
23. |
INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light 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 |
|
|
|
24. |
INSPECT MAP LIGHT ASSEMBLY (OUTPUT TO DCM (TELEMATICS TRANSCEIVER)) |
(a) Connect the I56 radio and display receiver assembly connector.
(b) Connect the T6 map light assembly connector.
(c) Connect the I72 DCM (telematics transceiver) connector.
(d) Turn the ignition switch to ACC.
|
(e) Connect an oscilloscope to terminals 6 (MCO+) and 5 (MCO-) of the T6 map light assembly connector. |
|
(f) Check the signal waveform according to the condition(s) in the table below.
|
Item |
Condition |
|---|---|
|
Measurement terminal |
T6-6 (MCO+) - T6-5 (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 |
|
|
|
25. |
INSPECT DCM (TELEMATICS TRANSCEIVER) (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY) |
(a) Connect the I56 radio and display receiver assembly connector.
(b) Connect the T6 map light assembly connector.
(c) Connect the I72 DCM (telematics transceiver) connector.
(d) Turn the ignition switch to ACC.
|
(e) Connect an oscilloscope to terminals 18 (MCO+) and 19 (MCO-) of the I72 DCM (telematics transceiver) connector. |
|
(f) Check the signal waveform according to the condition(s) in the table below.
|
Item |
Condition |
|---|---|
|
Measurement terminal |
I72-18 (MCO+) - I72-19 (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 |
|
|
26. |
INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light 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 |
|
|
27. |
INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light 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 |
|
|
|