Toyota Venza manuals

Toyota Venza: Microphone Circuit between Microphone and Radio Receiver

Toyota Venza Service Manual / Audio / Video / Audio And Visual System / Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

The radio and display receiver assembly and inner rear view mirror assembly (amplifier 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 inner rear view mirror assembly (amplifier microphone assembly), and the inner rear view mirror assembly (amplifier microphone assembly) sends microphone signals to the radio and display receiver assembly.

WIRING DIAGRAM


PROCEDURE

1.

CHECK MICROPHONE (OPERATION CHECK)

(a) Enter the "Microphone Check" screen. Refer to Check Microphone in Operation Check (See page ).



(b) When a 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

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY


NG

2.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - INNER REAR VIEW MIRROR ASSEMBLY (AMPLIFIER MICROPHONE ASSEMBLY)

(a) Disconnect the E42 radio and display receiver assembly connector.

(b) Disconnect the P12 inner rear view mirror assembly (amplifier microphone assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E42-4 (MACC) - P12-9 (ACC)

Always

Below 1 Ω

E42-5 (MIN+) - P12-11 (MIC+)

Always

Below 1 Ω

E42-19 (MIN-) - P12-12 (MIC-)

Always

Below 1 Ω

E42-6 (SNS2) - P12-10 (SGND)

Always

Below 1 Ω

E42-4 (MACC) - Body ground

Always

10 kΩ or higher

E42-5 (MIN+) - Body ground

Always

10 kΩ or higher

E42-19 (MIN-) - Body ground

Always

10 kΩ or higher

E42-18 (SGND) - Body ground

Always

10 kΩ or higher

E42-6 (SNS2) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

3.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

E42-4 (MACC) - Body ground

Ignition switch ACC

4 to 6 V


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E42-18 (SGND) - Body ground

Always

Below 1 Ω

E42-19 (MIN-) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Component with harness connected

(Radio and Display Receiver Assembly)


NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY


OK

4.

INSPECT INNER REAR VIEW MIRROR ASSEMBLY (AMPLIFIER MICROPHONE ASSEMBLY)

(a) Remove the inner rear view mirror assembly (amplifier microphone assembly) (See page ).


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

10 (SGND) - 12 (MIC-)

Always

Below 1 Ω

Text in Illustration

*a

Component without harness connected

(Inner Rear View Mirror Assembly (Amplifier Microphone Assembly))



NG

REPLACE INNER REAR VIEW MIRROR ASSEMBLY (AMPLIFIER MICROPHONE ASSEMBLY)


OK

5.

INSPECT INNER REAR VIEW MIRROR ASSEMBLY (AMPLIFIER MICROPHONE ASSEMBLY)

(a) Turn the ignition switch to ACC.

(b) Connect an oscilloscope to terminals 11 (MIC+) and 12 (MIC-) of the P12 inner rear view mirror assembly (amplifier microphone assembly) connector.


(c) Check the waveform of the inner rear view mirror assembly (amplifier microphone assembly) using the oscilloscope.

Result

Proceed to

A waveform synchronized with the voice input to the inner rear view mirror assembly (amplifier microphone assembly) is output.

A

A waveform synchronized with the voice input to the inner rear view mirror assembly (amplifier microphone assembly) is not output.

B

Text in Illustration

*a

Component with harness connected

(Inner Rear View Mirror Assembly (Amplifier Microphone Assembly))


A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


B

REPLACE INNER REAR VIEW MIRROR ASSEMBLY (AMPLIFIER MICROPHONE ASSEMBLY)

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