Toyota CH-R Service Manual: 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 Navigation System.

    Click here

  • 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.

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.

Click here

(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

(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.

NG

GO TO STEP 11

OK

3.

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

(a) Disconnect the F131 radio and display receiver assembly connector.

(b) Disconnect the R2 map light assembly (telephone microphone assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F131-25 (SNS2) - R2-1 (SNS2)

Always

Below 1 Ω

F131-25 (SNS2) or R2-1 (SNS2) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

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

(a) Disconnect the F131 radio and display receiver assembly connector.

(b) Disconnect the F134 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F131-21 (MIN+) - F134-18 (MCO+)

Always

Below 1 Ω

F131-22 (MIN-) - F134-19 (MCO-)

Always

Below 1 Ω

F131-21 (MIN+) or F134-18 (MCO+) - Body ground

Always

10 kΩ or higher

F131-22 (MIN-) or F134-19 (MCO-) - Body ground

Always

10 kΩ or higher

F131-24 (SGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

(a) Disconnect the F134 DCM (telematics transceiver) connector.

(b) Disconnect the R2 map light assembly (telephone microphone assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F134-33 (MCVD) - R2-9 (MACC)

Always

Below 1 Ω

F134-34 (MIC+) - R2-8 (MCO+)

Always

Below 1 Ω

F134-35 (MIC-) - R2-7 (MCO-)

Always

Below 1 Ω

F134-33 (MCVD) or R2-9 (MACC) - Body ground

Always

10 kΩ or higher

F134-34 (MIC+) or R2-8 (MCO+) - Body ground

Always

10 kΩ or higher

F134-35 (MIC-) or R2-7 (MCO-) - Body ground

Always

10 kΩ or higher

F134-32 (SGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Disconnect the F134 DCM (telematics transceiver) connector.

(b) Connect the radio and display receiver assembly connector.

*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

F131-24 (SGND) - Body ground

Always

Below 1 Ω

F131-22 (MIN-) - Body ground

Always

Below 1 Ω

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

7.

INSPECT DCM (TELEMATICS TRANSCEIVER)

(a) Connect the DCM (telematics transceiver) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

F134-33 (MCVD) - Body ground

Engine switch on (ACC)

4 to 6 V

*a

Component with harness connected

(DCM (Telematics Transceiver))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F134-35 (MIC-) - Body ground

Always

Below 1 Ω

F134-32 (SGND) - Body ground

Always

Below 1 Ω

NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

OK

8.

INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

(a) Remove the map light assembly (telephone microphone assembly).

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (SNS2) - 7 (MCO-)

Always

Below 1 Ω

*a

Component without harness connected

(Map light assembly (telephone microphone assembly))

NG

REPLACE MAP LIGHT ASSEMBLY (OUTPUT TO DCM (TELEMATICS TRANSCEIVER)

OK

9.

INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) (OUTPUT TO DCM (TELEMATICS TRANSCEIVER))

(a) Connect the F131 radio and display receiver assembly connector.

(b) Connect the map light assembly (telephone microphone assembly) connector.

(c) Connect the F134 DCM (telematics transceiver) connector.

(d) Turn the engine switch on (ACC).

(e) Connect an oscilloscope to terminals 8 (MCO+) and 7 (MCO-) of the R2 map light assembly connector.

*a

Component with harness connected

(Map Light Assembly (Telephone Microphone Assembly))

(f) Check the waveform of the map light assembly (telephone microphone assembly) using the oscilloscope.

Result

Proceed to

A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is output.

A

A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is not output.

B

B

REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

A

10.

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

(a) Connect the F131 radio and display receiver assembly connector.

(b) Connect the R2 map light assembly connector.

(c) Connect the DCM (telematics transceiver) connector.

(d) Turn the engine switch on (ACC).

(e) Connect an oscilloscope to terminals 18 (MCO+) and 19 (MCO-) of the F134 DCM (telematics transceiver) connector.

*a

Component with harness connected

DCM (Telematics Transceiver)

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

Item

Condition

Measurement terminal

F134-18 (MCO+) - F134-19 (MCO-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition

  1. Turn the engine switch on (ACC).
  2. Sound is input to the map light assembly when the user is closer than 125 mm from the map light 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.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

11.

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

(a) Disconnect the F130 radio and display receiver assembly connector.

(b) Disconnect the F135 navigation ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F130-25 (MCO+) - F135-13 (MIC+)

Always

Below 1 Ω

F130-26 (MCO-) - F135-14 (MIC-)

Always

Below 1 Ω

F130-25 (MCO+) or F135-13 (MIC+) - Body ground

Always

10 kΩ or higher

F130-26 (MCO-) or F135-14 (MIC-) - Body ground

Always

10 kΩ or higher

F130-24 (SGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

12.

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

(a) Disconnect the F135 navigation ECU connector.

(b) Turn the engine switch on (ACC).

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

Item

Condition

Measurement terminal

F135-13 (MIC+) - F135-14 (MIC-)

Tool setting

50 mV/DIV., 500 ms/DIV.

Vehicle condition

  1. Turn the engine switch on (ACC).
  2. Sound is input to the map light assembly when the user is closer than 125 mm from the map light 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

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