Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018QZ0
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 - 08/2018]
Title: NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: Microphone Circuit; 2018 MY Sienna [11/2017 - 08/2018]

Microphone Circuit

DESCRIPTION

  • w/o Manual (SOS) Switch:

    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 radio and display receiver assembly 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.

  • w/ Manual (SOS) Switch:

    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

CAUTION / NOTICE / HINT

NOTICE:

  • 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 is stored.
    • The radio and display receiver assembly may not operate normally.
  • Before replacing the DCM (telematics transceiver), refer to Registration.

    Click here 2018 - 2020 MY Sienna [11/2017 -        ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: DCM ACTIVATION

PROCEDURE

1.

CHECK MICROPHONE AND VOICE RECOGNITION (INPUT TO NAVIGATION ECU)

(a) Enter the "Microphone Check" screen. Refer to Check Microphone (Input to navigation ECU) in Operation Check.

(b) When 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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK MICROPHONE AND VOICE RECOGNITION (INPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Enter the "Microphone Check" screen. Refer to Check Microphone (Input to radio and display receiver assembly) in Operation Check.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: OPERATION CHECK

(b) When 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 (w/ Manual (SOS) Switch)

B

OK

C

B

GO TO STEP 6

C

GO TO STEP 12

A

3.

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

(a) Disconnect the D196 radio and display receiver assembly connector.

(b) Disconnect the T29 microphone amplifier assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D196-25 (SNS2) - T29-4 (SNS2)

Always

Below 1 Ω

D196-23 (MACC) - T29-1 (MACC)

Always

Below 1 Ω

D196-21 (MIN+) - T29-2 (MIC+)

Always

Below 1 Ω

D196-22 (MIN-) - T29-3 (MIC-)

Always

Below 1 Ω

D196-25 (SNS2) - Body ground

Always

10 kΩ or higher

D196-23 (MACC) - Body ground

Always

10 kΩ or higher

D196-21 (MIN+) - Body ground

Always

10 kΩ or higher

D196-22 (MIN-) - Body ground

Always

10 kΩ or higher

D196-24 (SGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Remove the radio and display receiver assembly with the connector(s) still connected.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D196-23 (MACC) - Body ground

Ignition switch ACC

4 to 6 V

*a

Component with harness connected

(Radio and Display Receiver Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D196-22 (MIN-) - Body ground

Always

Below 1 Ω

D196-24 (SGND) - Body ground

Always

Below 1 Ω

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

5.

CHECK MICROPHONE AMPLIFIER ASSEMBLY (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Check the output waveform.

(1) Remove the microphone amplifier assembly with the connector(s) still connected.

Click here 2016 - 2018 MY Sienna [12/2015 - 08/2018]; AUDIO / VIDEO: MICROPHONE AMPLIFIER: REMOVAL

*a

Component with harness connected

(Microphone Amplifier Assembly)

(2) Connect an oscilloscope to terminal T29-2 (MIC+) and T29-3 (MIC-).

(3) Turn the ignition switch ACC.

(4) Sound is input to the microphone amplifier assembly when the user is closer than 125 mm from the microphone amplifier assembly sound holes in the roof headlining holder cover.

(5) Check the signal waveform according to the condition(s) in the table below.

Item

Condition

Measurement terminal

T29-2 (MIC+) - T29-3 (MIC-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition

  1. Ignition switch ACC
  2. Sound is input to the microphone amplifier assembly when the user is closer than 125 mm from the microphone amplifier assembly 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.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE MICROPHONE AMPLIFIER ASSEMBLY

6.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Disconnect the D196 radio and display receiver assembly connector.

(b) Disconnect the T29 microphone amplifier assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D196-25 (SNS2) - T29-4 (SNS2)

Always

Below 1 Ω

D196-25 (SNS2) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

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

(a) Disconnect the D196 radio and display receiver assembly connector.

(b) Disconnect the D73 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D196-21 (MIN+) - D73-18 (MCO+)

Always

Below 1 Ω

D196-22 (MIN-) - D73-19 (MCO-)

Always

Below 1 Ω

D196-21 (MIN+) - Body ground

Always

10 kΩ or higher

D196-22 (MIN-) - Body ground

Always

10 kΩ or higher

D196-24 (SGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK HARNESS AND CONNECTOR

(a) Disconnect the D73 DCM (telematics transceiver) connector.

(b) Disconnect the T29 microphone amplifier assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D73-33 (MCVD) - T29-1 (MACC)

Always

Below 1 Ω

D73-34 (MCI+) - T29-2 (MIC+)

Always

Below 1 Ω

D73-35 (MCI-) - T29-3 (MIC-)

Always

Below 1 Ω

D73-33 (MCVD) - Body ground

Always

10 kΩ or higher

D73-34 (MCI+) - Body ground

Always

10 kΩ or higher

D73-35 (MCI-) - Body ground

Always

10 kΩ or higher

D73-32 (SGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.

CHECK DCM (TELEMATICS TRANSCEIVER)

(a) Remove the DCM (telematics transceiver) with the connector(s) still connected.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; CELLULAR COMMUNICATION: MAYDAY ECU: REMOVAL

*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

D73-33 (MCVD) - Body ground

Ignition switch ACC

4 to 6 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D73-32 (SGND) - Body ground

Always

Below 1 Ω

D73-35 (MCI-) - Body ground

Always

Below 1 Ω

NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

OK

10.

CHECK MICROPHONE AMPLIFIER ASSEMBLY (OUTPUT TO DCM (TELEMATICS TRANSCEIVER))

(a) Check the output waveform.

(1) Remove the microphone amplifier assembly with the connector(s) still connected.

Click here 2016 - 2018 MY Sienna [12/2015 - 08/2018]; AUDIO / VIDEO: MICROPHONE AMPLIFIER: REMOVAL

*a

Component with harness connected

(Microphone Amplifier Assembly)

(2) Connect an oscilloscope to terminal T29-2 (MIC+) and T29-3 (MIC-).

(3) Turn the ignition switch ACC.

(4) Sound is input to the microphone amplifier assembly when the user is closer than 125 mm from the microphone amplifier assembly sound holes in the roof headlining holder cover.

(5) Check the signal waveform according to the condition(s) in the table below.

Item

Condition

Measurement terminal

T29-2 (MIC+) - T29-3 (MIC-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition

  1. Ignition switch ACC
  2. Sound is input to the microphone amplifier assembly when the user is closer than 125 mm from the microphone amplifier assembly 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.

NG

REPLACE MICROPHONE AMPLIFIER ASSEMBLY

OK

11.

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

(a) Check the output waveform.

(1) Remove the DCM (telematics transceiver) with the connector(s) still connected.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; CELLULAR COMMUNICATION: MAYDAY ECU: REMOVAL

*a

Component with harness connected

(DCM [Telematics Transceiver])

(2) Connect an oscilloscope to terminal D73-18 (MCO+) and D73-19 (MCO-).

(3) Turn the ignition switch ACC.

(4) Sound is input to the microphone amplifier assembly when the user is closer than 125 mm from the microphone amplifier assembly sound holes in the roof headlining holder cover.

(5) Check the signal waveform according to the condition(s) in the table below.

Item

Condition

Measurement terminal

D73-18 (MCO+) - D73-19 (MCO-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition

  1. Ignition switch ACC
  2. Sound is input to the microphone amplifier assembly when the user is closer than 125 mm from the microphone amplifier assembly 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.

OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

12.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)

(a) Disconnect the D197 radio and display receiver assembly connector.

(b) Disconnect the D199 navigation ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D197-25 (MCO+) - D199-13 (MIC+)

Always

Below 1 Ω

D197-26 (MCO-) - D199-14 (MIC-)

Always

Below 1 Ω

D197-25 (MCO+) or D199-13 (MIC+) - Body ground

Always

10 kΩ or higher

D197-26 (MCO-) or D199-14 (MIC-) - Body ground

Always

10 kΩ or higher

D197-24 (SGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

13.

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY (OUTPUT TO NAVIGATION ECU)

(a) Disconnect the D199 navigation ECU connector.

(b) Turn the ignition switch ACC.

(c) Check the signal waveform according to the condition(s) in the table below.

Item

Condition

Measurement terminal

D199-13 (MIC+) - D199-14 (MIC-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition

  1. Turn the ignition switch ACC.
  2. 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.

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.

*a

Front view of wire harness connector

(to Navigation ECU)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY