Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000272EE
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 -           ]
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Single Knob Type): Microphone Circuit; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]

Microphone Circuit

WIRING DIAGRAM

w/ DCM (Telematics Transceiver)
w/o DCM (Telematics Transceiver)

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the telematics transceiver, make sure to replace it with a new one (w/ Telematics Transceiver for LEXUS Connected Services or LEXUS Connect).
  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Single Knob Type): PRECAUTION

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 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Single Knob Type): DIAGNOSIS SYSTEM

*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 AND DISPLAY RECEIVER ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL

C

GO TO STEP 6

B

3.

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

(a) Disconnect the I176 radio and display receiver assembly connector.

(b) Disconnect the T25 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

I176-17 (MI2+) - T25-2 (MO2+)

Always

Below 1 Ω

I176-18 (MI2-) - T25-4 (MO2-)

Always

Below 1 Ω

I176-20 (MAC2) - T25-1 (MAC2)

Always

Below 1 Ω

I176-21 (SNS2) - T25-5 (SNS2)

Always

Below 1 Ω

I176-17 (MI2+) or T25-2 (MO2+) - Body ground

Always

10 kΩ or higher

I176-18 (MI2-) or T25-4 (MO2-) - Body ground

Always

10 kΩ or higher

I176-20 (MAC2) or T25-1 (MAC2) - Body ground

Always

10 kΩ or higher

I176-21 (SNS2) or T25-5 (SNS2) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

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

(a) With the I176 radio and display receiver assembly connector connected, disconnect the T25 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

T25-4(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

T25-1(MAC2) - Body ground

IG ON

7.5 to 8.5 V

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL

OK

5.

CHECK TELEPHONE MICROPHONE ASSEMBLY LH (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

T25-2 (MO2+) - T25-4 (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 microphone case LH 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.
  • 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 LH)

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 AND DISPLAY RECEIVER ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL

B

REPLACE TELEPHONE MICROPHONE ASSEMBLY RH 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: MICROPHONE: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: MICROPHONE: REMOVAL

6.

CHECK TELEMATICS TRANSCEIVER (MICROPHONE POWER SOURCE AND BODY GROUND)

HINT:

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

(a) 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

*a

Component with harness connected

(Telematics transceiver)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I143-5(MCVD) - Body ground

IG ON

7.5 to 8.5 V

NG

GO TO STEP 13

OK

7.

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

HINT:

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

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

Item

Condition

Tester Connection

I143-16 (MCO+) - I143-32 (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 microphone case RH 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.
  • 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

(DCM (Telematics transceiver))

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 9

A

8.

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

(a) Disconnect the I175 radio and display receiver assembly connector.

(b) Disconnect the I143 Telematics transceiver connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I175-21 (MIN+) - I143-16 (MCO+)

Always

Below 1 Ω

I175-22 (MIN-) - I143-32 (MCO-)

Always

Below 1 Ω

I175-21 (MIN+) or I143-16 (MCO+) - Body ground

Always

10 kΩ or higher

I175-22 (MIN-) or I143-32 (MCO-) - Body ground

Always

10 kΩ or higher

OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

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

(a) Disconnect the I175 radio and display receiver assembly connector.

(b) Disconnect the I143 Telematics transceiver connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I175-21 (MIN+) - I143-16(MCO+)

Always

Below 1 Ω

I175-22 (MIN-) - I143-32 (MCO-)

Always

Below 1 Ω

I175-21 (MIN+) or I143-16 (MCO+) - Body ground

Always

10 kΩ or higher

I175-22 (MIN-) or I143-32 (MCO-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

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

(a) Disconnect the I143 Telematics transceiver connector.

(b) Disconnect the T24 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

I143-5 (MCVD) - T24-1 (MAC1)

Always

Below 1 Ω

I143-6 (MCI+) - T24-2 (MO1+)

Always

Below 1 Ω

I143-7 (MCI-) - T24-4 (MO1-)

Always

Below 1 Ω

I143-5 (MCVD) or T24-1(MAC1) - Body ground

Always

10 kΩ or higher

I143-6(MCI+) or T24-2 (MO1+) - Body ground

Always

10 kΩ or higher

I143-7 (MCI-) or T24-4 (MO1-) - 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 - TELEPHONE MICROPHONE ASSEMBLY LH)

(a) Disconnect the I175 radio and display receiver assembly connector.

(b) Disconnect the T24 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

I175-25 (SNS) - T24-5 (SNS1)

Always

Below 1 Ω

I175-25 (SNS) or T24-5 (SNS1) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

12.

CHECK TELEPHONE MICROPHONE ASSEMBLY LH (OUTPUT TO TELEMATICS TRANSCEIVER)

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

Item

Condition

Tester Connection

T24-2 (MO1+) - T24-4 (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 microphone case RH 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.
  • 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

(DCM (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 DCM (TELEMATICS TRANSCEIVER) 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

B

REPLACE TELEPHONE MICROPHONE ASSEMBLY LH 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: MICROPHONE: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: MICROPHONE: REMOVAL

13.

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

(a) Disconnect the I143 Telematics transceiver connector.

(b) Disconnect the T24 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

I143-5 (MCVD) - T24-1 (MAC1)

Always

Below 1 Ω

I143-6 (MCI+) - T24-2 (MO1+)

Always

Below 1 Ω

I143-7 (MCI-) - T24-4 (MO1-)

Always

Below 1 Ω

I143-5 (MCVD) or T24-1 (MAC1) - Body ground

Always

10 kΩ or higher

I143-6 (MCI+) or T24-2 (MO1+) - Body ground

Always

10 kΩ or higher

I143-7 (MCI-) or T24-4 (MO1-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

14.

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

(a) Disconnect the I175 radio and display receiver assembly connector.

(b) Disconnect the I143 telematics transceiver connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I175-21 (MIN+) - I143-16 (MCO+)

Always

Below 1 Ω

I175-22 (MIN-) - I143-32 (MCO-)

Always

Below 1 Ω

I175-21 (MIN+) or I143-16 (MCO+) - Body ground

Always

10 kΩ or higher

I175-22 (MIN-) or I143-32 (MCO-) - Body ground

Always

10 kΩ or higher

OK

REPLACE DCM (TELEMATICS TRANSCEIVER) 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.

CHECK MICROPHONE

(a) Enter diagnostic mode.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Single Knob Type): DIAGNOSIS SYSTEM

*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 AND DISPLAY RECEIVER ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL

C

GO TO STEP 19

B

16.

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

(a) Disconnect the I176 radio and display receiver assembly connector.

(b) Disconnect the T25 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

I176-17 (MI2+) - T25-2 (MO2+)

Always

Below 1 Ω

I176-18 (MI2-) - T25-4 (MO2-)

Always

Below 1 Ω

I176-20 (MAC2) - T25-1 (MAC2)

Always

Below 1 Ω

I176-21 (SNS2) - T25-5 (SNS2)

Always

Below 1 Ω

I176-17 (MI2+) or T25-2 (MO2+) - Body ground

Always

10 kΩ or higher

I176-18 (MI2-) or T25-4 (MO2-) - Body ground

Always

10 kΩ or higher

I176-20 (MAC2) or T25-1 (MAC2) - Body ground

Always

10 kΩ or higher

I176-21 (SNS2) or T25-5 (SNS2) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

17.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (MO2, MI2-)

(a) With the I176 radio and display receiver assembly connector connected, disconnect the T25 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

T25-4 (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

T25-1 (MAC2) - Body ground

IG ON

7.5 to 8.5 V

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL

OK

18.

INSPECT 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

T25-2(MO1+) - T25-4(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 microphone case LH 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.
  • 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

(DCM (Telephone microphone assembly LH))

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 AND DISPLAY RECEIVER ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL

B

REPLACE TELEPHONE MICROPHONE ASSEMBLY RH 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: MICROPHONE: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: MICROPHONE: REMOVAL

19.

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

(a) Disconnect the I175 radio and display receiver assembly connector.

(b) Disconnect the T24 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

I175-17(MI2+) - T24-2(MO2+)

Always

Below 1 Ω

I175-18(MI2-) - T24-4(MO2-)

Always

Below 1 Ω

I175-20(MAC2) - T24-1(MAC2)

Always

Below 1 Ω

I175-21(SNS2) - T24-5(SNS2)

Always

Below 1 Ω

I175-17(MI2+) or T24-2(MO2+) - Body ground

Always

10 kΩ or higher

I175-18(MI2-) or T24-4(MO2-) - Body ground

Always

10 kΩ or higher

I175-20(MAC2) or T24-1(MAC2) - Body ground

Always

10 kΩ or higher

I175-21(SNS2) or T24-5(SNS2) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

20.

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

(a) With the I175 radio and display receiver assembly connector connected, disconnect the M11 telephone microphone assembly RH connecter.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T24-4 (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

T24-1(MAC1) - Body ground

IG ON

7.5 to 8.5 V

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL

OK

21.

INSPECT TELEPHONE MICROPHONE ASSEMBLY LH (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

T24-2(MO1+) - T24-4(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 microphone case RH 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.
  • 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 AND DISPLAY RECEIVER ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL

B

REPLACE TELEPHONE MICROPHONE ASSEMBLY RH 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: MICROPHONE: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: MICROPHONE: REMOVAL