Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Microphone Circuit

Toyota Corolla Cross (2022-2024) Service Manual / Audio & Visual & Telematics / Audio / Video / Audio And Visual System / Microphone Circuit

WIRING DIAGRAM

w/ Telematics Transceiver w/o Telematics Transceiver

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the telematics transceiver, make sure to replace it with a new one.
  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed.

    Click here

PROCEDURE

1.

CHECK MODEL

Result

Proceed to

w/ Telematics Transceiver

A

w/o Telematics Transceiver

B
B

GO TO STEP 15

A

2.

CHECK MICROPHONE

(a) Enter diagnostic mode.

Click here

*a

Mic 1 Input Level

*b

Mic 2 Input Level

(b) Select "Function Check/Setting" from the "Service Menu" screen.

(c) Select "Microphone Check" from the "Function Check/Setting I" screen.

(d) Speak into each microphone assembly and check the microphone input level gauge display.

OK:

The microphone input levels of the gauge change in accordance with the voice.

Result

Proceed to

Microphone input levels change for microphone 1 and 2

A

Microphone input level does not change for microphone 1

B

Microphone input level does not change for microphone 2

C
A

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

C

GO TO STEP 12

B

3.

CHECK TELEMATICS TRANSCEIVER (MICROPHONE POWER SOURCE AND BODY GROUND)

HINT:

Measure the connector of the telematics transceiver while it is connected.

*a

Component with harness connected

(Telematics Transceiver)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I200-7 (MCI-) - Body ground

Always

Below 1 Ω

I200-23 (SGND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I200-5 (MCVD) - Body ground

Ignition switch ON

7.5 to 8.5 V
NG

GO TO STEP 10

OK

4.

CHECK TELEMATICS TRANSCEIVER (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

HINT:

Measure the connector of the telematics transceiver while it is connected.

*a

Component with harness connected

(Telematics Transceiver)

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

Item

Condition

Tester Connection

I200-16 (MCO+) - I200-32 (MCO-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition
  1. Turn the ignition switch to ON
  2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly LH sound holes in the roof headlining holder cover

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.
  • In order to ensure that a consistent sound level is input to the microphone, use a digital voice recorder, etc., to play back sound in the same location with respect to the microphone.

Result

Proceed to

A waveform synchronized with voice signals is output

A

A waveform synchronized with voice signals is not output

B
B

GO TO STEP 6

A

5.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - TELEMATICS TRANSCEIVER)

(a) Disconnect the I253 radio and display receiver assembly connector.

(b) Disconnect the I200 telematics transceiver connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I253-21 (MIN+) - I200-16 (MCO+)

Always

Below 1 Ω

I253-22 (MIN-) - I200-32 (MCO-)

Always

Below 1 Ω

I253-21 (MIN+) - Body ground

Always

10 kΩ or higher

I253-22 (MIN-) - Body ground

Always

10 kΩ or higher

I253-24 (SGND) - Body ground

Always

10 kΩ or higher
OK

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - TELEMATICS TRANSCEIVER)

(a) Disconnect the I253 radio and display receiver assembly connector.

(b) Disconnect the I200 telematics transceiver connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I253-21 (MIN+) - I200-16 (MCO+)

Always

Below 1 Ω

I253-22 (MIN-) - I200-32 (MCO-)

Always

Below 1 Ω

I253-21 (MIN+) - Body ground

Always

10 kΩ or higher

I253-22 (MIN-) - Body ground

Always

10 kΩ or higher

I253-24 (SGND) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER - TELEPHONE MICROPHONE ASSEMBLY LH)

(a) Disconnect the I200 telematics transceiver connector.

(b) Disconnect the T30 telephone microphone assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I200-5 (MCVD) - T30-1 (MAC1)

Always

Below 1 Ω

I200-6 (MCI+) - T30-2 (MO1+)

Always

Below 1 Ω

I200-7 (MCI-) - T30-4 (MO1-)

Always

Below 1 Ω

I200-5 (MCVD) - Body ground

Always

10 kΩ or higher

I200-6 (MCI+) - Body ground

Always

10 kΩ or higher

I200-7 (MCI-) - Body ground

Always

10 kΩ or higher

I200-23 (SGND) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY LH)

(a) Disconnect the I253 radio and display receiver assembly connector.

(b) Disconnect the T30 telephone microphone assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I253-25 (SNS) - T30-5 (SNS1)

Always

Below 1 Ω

I253-25 (SNS) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK TELEPHONE MICROPHONE ASSEMBLY LH (OUTPUT TO TELEMATICS TRANSCEIVER)

*a

Component with harness connected

(Telephone Microphone Assembly LH)

(a) Using an oscilloscope, measure the waveform according to the condition(s) in the table below.

Item

Condition

Tester Connection

T30-2 (MO1+) - T30-4 (MO1-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition
  1. Turn the ignition switch to ON
  2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly LH sound holes in the roof headlining holder cover

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.
  • In order to ensure that a consistent sound level is input to the microphone, use a digital voice recorder, etc., to play back sound in the same location with respect to the microphone.

Result

Proceed to

A waveform synchronized with voice signals is output

A

A waveform synchronized with voice signals is not output

B
A

REPLACE TELEMATICS TRANSCEIVER

B

REPLACE TELEPHONE MICROPHONE ASSEMBLY LH

10.

CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER - TELEPHONE MICROPHONE ASSEMBLY LH)

(a) Disconnect the I200 telematics transceiver connector.

(b) Disconnect the T30 telephone microphone assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I200-5 (MCVD) - T30-1 (MAC1)

Always

Below 1 Ω

I200-6 (MCI+) - T30-2 (MO1+)

Always

Below 1 Ω

I200-7 (MCI-) - T30-4 (MO1-)

Always

Below 1 Ω

I200-5 (MCVD) - Body ground

Always

10 kΩ or higher

I200-6 (MCI+) - Body ground

Always

10 kΩ or higher

I200-7 (MCI-) - Body ground

Always

10 kΩ or higher

I200-23 (SGND) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - TELEMATICS TRANSCEIVER)

(a) Disconnect the I253 radio and display receiver assembly connector.

(b) Disconnect the I200 telematics transceiver connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I253-21 (MIN+) - I200-16 (MCO+)

Always

Below 1 Ω

I253-22 (MIN-) - I200-32 (MCO-)

Always

Below 1 Ω

I253-21 (MIN+) - Body ground

Always

10 kΩ or higher

I253-22 (MIN-) - Body ground

Always

10 kΩ or higher

I253-24 (SGND) - Body ground

Always

10 kΩ or higher
OK

REPLACE TELEMATICS TRANSCEIVER

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY RH)

(a) Disconnect the I254 radio and display receiver assembly connector.

(b) Disconnect the T34 telephone microphone assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I254-17 (MI2+) - T34-2 (MO2+)

Always

Below 1 Ω

I254-18 (MI2-) - T34-4 (MO2-)

Always

Below 1 Ω

I254-20 (MAC2) - T34-1 (MAC2)

Always

Below 1 Ω

I254-21 (SNS2) - T34-5 (SNS2)

Always

Below 1 Ω

I254-17 (MI2+) - Body ground

Always

10 kΩ or higher

I254-18 (MI2-) - Body ground

Always

10 kΩ or higher

I254-20 (MAC2) - Body ground

Always

10 kΩ or higher

I254-19 (SGD2) - Body ground

Always

10 kΩ or higher

I254-21 (SNS2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

13.

CHECK RADIO & DISPLAY RECEIVER ASSEMBLY (MAC2, MI2-)

(a) With the I254 radio and display receiver assembly connector connected, disconnect the T34 telephone microphone assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T34-4 (MO2-) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

T34-1 (MAC2) - Body ground

Ignition switch ON

7.5 to 8.5 V
NG

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

OK

14.

CHECK TELEPHONE MICROPHONE ASSEMBLY RH (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Using an oscilloscope, measure the waveform according to the condition(s) in the table below.

Item

Condition

Tester Connection

T34-2 (MO2+) - T34-4 (MO2-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition
  1. Turn the ignition switch to ON
  2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly RH sound holes in the roof headlining holder cover

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.
  • In order to ensure that a consistent sound level is input to the microphone, use a digital voice recorder, etc., to play back sound in the same location with respect to the microphone.

*a

Component with harness connected

(Telephone microphone assembly RH)

Result

Proceed to

A waveform synchronized with voice signals is output

A

A waveform synchronized with voice signals is not output

B
A

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

B

REPLACE TELEPHONE MICROPHONE ASSEMBLY RH

15.

CHECK MICROPHONE

(a) Enter diagnostic mode.

Click here

*a

Mic 1 Input Level

*b

Mic 2 Input Level

(b) Select "Function Check/Setting" from the "Service Menu" screen.

(c) Select "Microphone Check" from the "Function Check/Setting I" screen.

(d) Speak into each microphone assembly and check the microphone input level gauge display.

OK:

The microphone input levels of the gauge change in accordance with the voice.

Result

Proceed to

Microphone input levels change for microphone 1 and 2

A

Microphone input level does not change for microphone 1

B

Microphone input level does not change for microphone 2

C
A

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

C

GO TO STEP 19

B

16.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY LH)

(a) Disconnect the I253 radio and display receiver assembly connector.

(b) Disconnect the T30 telephone microphone assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I253-21 (MIN+) - T30-2 (MO1+)

Always

Below 1 Ω

I253-22 (MIN-) - T30-4 (MO1-)

Always

Below 1 Ω

I253-23 (MACC) - T30-1 (MAC1)

Always

Below 1 Ω

I253-25 (SNS) - T30-5 (SNS1)

Always

Below 1 Ω

I253-21 (MIN+) - Body ground

Always

10 kΩ or higher

I253-22 (MIN-) - Body ground

Always

10 kΩ or higher

I253-23 (MACC) - Body ground

Always

10 kΩ or higher

I253-24 (SGND) - Body ground

Always

10 kΩ or higher

I253-25 (SNS) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

17.

INSPECT RADIO & DISPLAY RECEIVER ASSEMBLY (MACC, MIN-)

(a) With the I253 radio and display receiver assembly connector connected, disconnect the T30 telephone microphone assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T30-4 (MO1-) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

T30-1 (MACC) - Body ground

Always

7.5 to 8.5 V
NG

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

OK

18.

INSPECT TELEPHONE MICROPHONE ASSEMBLY LH (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

*a

Component with harness connected

(Telephone microphone assembly LH)

(a) Using an oscilloscope, measure the waveform according to the condition(s) in the table below.

Item

Condition

Tester Connection

T30-2 (MO1+) - T30-4 (MO1-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition
  1. Turn the ignition switch to ON
  2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly LH sound holes in the roof headlining holder cover

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.
  • In order to ensure that a consistent sound level is input to the microphone, use a digital voice recorder, etc., to play back sound in the same location with respect to the microphone.

Result

Proceed to

A waveform synchronized with voice signals is output

A

A waveform synchronized with voice signals is not output

B
A

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

B

REPLACE TELEPHONE MICROPHONE ASSEMBLY LH

19.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY RH)

(a) Disconnect the I254 radio and display receiver assembly connector.

(b) Disconnect the T34 telephone microphone assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I254-17 (MI2+) - T34-2 (MO2+)

Always

Below 1 Ω

I254-18 (MI2-) - T34-4 (MO2-)

Always

Below 1 Ω

I254-20 (MAC2) - T34-1 (MAC2)

Always

Below 1 Ω

I254-21 (SNS) - T34-5 (SNS2)

Always

Below 1 Ω

I254-17 (MI2+) - Body ground

Always

10 kΩ or higher

I254-18 (MI2-) - Body ground

Always

10 kΩ or higher

I254-20 (MAC2) - Body ground

Always

10 kΩ or higher

I254-19 (SGD2) - Body ground

Always

10 kΩ or higher

I254-21 (SNS2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

20.

CHECK RADIO & DISPLAY RECEIVER ASSEMBLY (MAC2, MI2-)

(a) With the I254 radio and display receiver assembly connector connected, disconnect the T34 telephone microphone assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T34-4 (MO2-) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

T34-1 (MAC2) - Body ground

Ignition switch ON

7.5 to 8.5 V
NG

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

OK

21.

CHECK TELEPHONE MICROPHONE ASSEMBLY RH (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Using an oscilloscope, measure the waveform according to the condition(s) in the table below.

Item

Condition

Tester Connection

T34-2 (MO2+) - T34-4 (MO2-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition
  1. Turn the ignition switch to ON
  2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly RH sound holes in the roof headlining holder cover

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.
  • In order to ensure that a consistent sound level is input to the microphone, use a digital voice recorder, etc., to play back sound in the same location with respect to the microphone.

*a

Component with harness connected

(Telephone microphone assembly RH)

Result

Proceed to

A waveform synchronized with voice signals is output

A

A waveform synchronized with voice signals is not output

B
A

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

B

REPLACE TELEPHONE MICROPHONE ASSEMBLY RH

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