Toyota CH-R Service Manual: Microphone Circuit

Toyota CH-R Service Manual / Navigation / Multi Info Display / Navigation System / 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.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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.

GO TO STEP 11

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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)

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

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

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))

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

REPLACE DCM (TELEMATICS TRANSCEIVER)

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))

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

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.

(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

REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

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.

(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	Turn the engine switch on (ACC). 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.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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).

Item	Condition
Measurement terminal	F135-13 (MIC+) - F135-14 (MIC-)
Tool setting	50 mV/DIV., 500 ms/DIV.
Vehicle condition	Turn the engine switch on (ACC). 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)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

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