Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM1000000026OM0
Model Year Start: 2023 Model: RAV4 Prod Date Range: [10/2022 -           ]
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Microphone Circuit; 2023 - 2024 MY RAV4 RAV4 HV [10/2022 -        ]

Microphone Circuit

DESCRIPTION

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

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 2023 - 2024 MY RAV4 RAV4 HV [10/2022 -        ]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: PRECAUTION

  • Before replacing the DCM (telematics transceiver), refer to Registration.

    Click here 2022 - 2024 MY RAV4 [12/2021 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

PROCEDURE

1.

CHECK MICROPHONE (OPERATION CHECK)

(a) Enter diagnostic mode.

Click here 2023 - 2024 MY RAV4 RAV4 HV [10/2022 -        ]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: DIAGNOSIS SYSTEM

*a

Microphone 1 input level gauge

*b

Microphone 2 input level gauge

(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

C

GO TO STEP 15

B

2.

CHECK MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ Manual (SOS) Switch

A

w/o Manual (SOS) Switch

B
B

GO TO STEP 12

A

3.

CHECK DCM (TELEMATICS TRANSCEIVER) (MICROPHONE POWER SOURCE AND BODY GROUND)

HINT:

Measure the connector of the DCM (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

G131-7 (MCI-) - Body ground

Always

Below 1 Ω

G131-23 (SGND) - Body ground

Always

Below 1 Ω

*a

Component with harness connected

(DCM [Telematics Transceiver])

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

G131-5 (MCVD) - Body ground

Ignition switch ON

7.5 to 8.5 V
NG

GO TO STEP 10

OK

4.

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

HINT:

Measure the connector of the DCM (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

G131-16 (MCO+) - G131-32 (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 6

A

5.

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

(a) Disconnect the G138 radio and display receiver assembly connector.

(b) Disconnect the G131 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G138-21 (MIN+) - G131-16 (MCO+)

Always

Below 1 Ω

G138-22 (MIN-) - G131-32 (MCO-)

Always

Below 1 Ω

G138-21 (MIN+) - Body ground

Always

10 kΩ or higher

G138-22 (MIN-) - Body ground

Always

10 kΩ or higher
OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

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

(a) Disconnect the G138 radio and display receiver assembly connector.

(b) Disconnect the G131 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G138-21 (MIN+) - G131-16 (MCO+)

Always

Below 1 Ω

G138-22 (MIN-) - G131-32 (MCO-)

Always

Below 1 Ω

G138-21 (MIN+) - Body ground

Always

10 kΩ or higher

G138-22 (MIN-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - TELEPHONE MICROPHONE ASSEMBLY RH)

(a) Disconnect the G131 DCM (telematics transceiver) connector.

(b) Disconnect the P25 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

G131-5 (MCVD) - P25-1 (MAC1)

Always

Below 1 Ω

G131-6 (MCI+) - P25-2 (MO1+)

Always

Below 1 Ω

G131-7 (MCI-) - P25-4 (MO1-)

Always

Below 1 Ω

G131-5 (MCVD) - Body ground

Always

10 kΩ or higher

G131-6 (MCI+) - Body ground

Always

10 kΩ or higher

G131-7 (MCI-) - Body ground

Always

10 kΩ or higher

G131-23 (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 G138 radio and display receiver assembly connector.

(b) Disconnect the P25 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

G138-25 (SNS) - P25-5 (SNS1)

Always

Below 1 Ω

G138-25 (SNS) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK TELEPHONE MICROPHONE ASSEMBLY LH (OUTPUT TO DCM [TELEMATICS TRANSCEIVER])

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

Item

Condition

Tester Connection

P26-2 (MO2+) - P26-4 (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 DCM (TELEMATICS TRANSCEIVER)

B

REPLACE TELEPHONE MICROPHONE ASSEMBLY LH

10.

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

(a) Disconnect the G131 DCM (telematics transceiver) connector.

(b) Disconnect the P25 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

G131-5 (MCVD) - P25-1 (MAC1)

Always

Below 1 Ω

G131-6 (MCI+) - P25-2 (MO1+)

Always

Below 1 Ω

G131-7 (MCI-) - P25-4 (MO1-)

Always

Below 1 Ω

G131-5 (MCVD) or P25-1 (MAC1) - Body ground

Always

10 kΩ or higher

G131-6 (MCI+) or P25-2 (MO1+) - Body ground

Always

10 kΩ or higher

G131-7 (MCI-) or P25-4 (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 - DCM [TELEMATICS TRANSCEIVER])

(a) Disconnect the G138 radio and display receiver assembly connector.

(b) Disconnect the G131 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G138-21 (MIN+) - G131-16 (MCO+)

Always

Below 1 Ω

G138-22 (MIN-) - G131-32 (MCO-)

Always

Below 1 Ω

G138-21 (MIN+) or G131-16 (MCO+) - Body ground

Always

10 kΩ or higher

G138-22 (MIN-) or G131-32 (MCO-) - Body ground

Always

10 kΩ or higher
OK

REPLACE DCM (TELEMATICS TRANSCEIVER)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.

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

(a) Disconnect the G138 radio and display receiver assembly connector.

(b) Disconnect the P25 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

G138-25 (SNS) - P25-5 (SNS1)

Always

Below 1 Ω

G138-23 (MACC) - P25-1 (MAC1)

Always

Below 1 Ω

G138-21 (MIN+) - P25-2 (MO1+)

Always

Below 1 Ω

G138-22 (MIN-) - P25-4 (MO1-)

Always

Below 1 Ω

G138-25 (SNS) - Body ground

Always

10 kΩ or higher

G138-23 (MACC) - Body ground

Always

10 kΩ or higher

G138-21 (MIN+) - Body ground

Always

10 kΩ or higher

G138-22 (MIN-) - Body ground

Always

10 kΩ or higher

G138-24 (SGND) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

13.

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

(a) With the G138 radio and display receiver assembly connector connected, disconnect the P25 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

P25-4 (MO1-) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

P25-1 (MAC1) - Body ground

Ignition switch ON

7.5 to 8.5 V
NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

14.

CHECK TELEPHONE MICROPHONE ASSEMBLY (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

P25-2 (MO1+) - P25-4 (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.

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

B

REPLACE TELEPHONE MICROPHONE ASSEMBLY LH

15.

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

(a) Disconnect the G138 radio and display receiver assembly connector.

(b) Disconnect the P25 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

G138-25 (SNS) - P25-5 (SNS1)

Always

Below 1 Ω

G138-23 (MACC) - P25-1 (MAC1)

Always

Below 1 Ω

G138-21 (MIN+) - P25-2 (MO1+)

Always

Below 1 Ω

G138-22 (MIN-) - P25-4 (MO1-)

Always

Below 1 Ω

G138-25 (SNS) - Body ground

Always

10 kΩ or higher

G138-23 (MACC) - Body ground

Always

10 kΩ or higher

G138-21 (MIN+) - Body ground

Always

10 kΩ or higher

G138-22 (MIN-) - Body ground

Always

10 kΩ or higher

G138-24 (SGND) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

16.

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

(a) With the G138 radio and display receiver assembly connector connected, disconnect the P25 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

P25-4 (MO1-) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

P25-1 (MAC1) - Body ground

Ignition switch ON

7.5 to 8.5 V
NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

17.

CHECK 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

P25-2 (MO1+) - P25-4 (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.

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

B

REPLACE TELEPHONE MICROPHONE ASSEMBLY LH