Toyota Venza: Voice Recognition Microphone Disconnected (B1579)

Toyota Venza Service Manual / Audio / Video / Audio And Visual System / Voice Recognition Microphone Disconnected (B1579)

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.

This DTC is stored when a microphone connection detection signal line is disconnected.

DTC No.	DTC Detection Condition	Trouble Area
B1579	Microphone signal is lost.	Inner rear view mirror assembly (amplifier microphone assembly) Radio and display receiver assembly Harness or connector

WIRING DIAGRAM

PROCEDURE

1.	INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E42-19 (MIN-) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Component with harness connected (Radio and Display Receiver Assembly)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

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.

Standard Resistance:

Tester Connection	Condition	Specified Condition
E42-6 (SNS2) - P12-10 (SGND)	Always	Below 1 Ω
E42-19 (MIN-) - P12-12 (MIC-)	Always	Below 1 Ω
E42-6 (SNS2) - Body ground	Always	10 kΩ or higher
E42-19 (MIN-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	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))

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

REPLACE INNER REAR VIEW MIRROR ASSEMBLY (AMPLIFIER MICROPHONE ASSEMBLY)

AV Signal Stoppage (Low Battery Voltage) (B158F)

DESCRIPTION This DTC is stored when a video or audio signal is interrupted due to battery voltage input to the radio and display receiver assembly dropping temporarily. DTC No. ...

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DESCRIPTION This DTC is stored when a malfunction occurs in a connected device. DTC No. DTC Detection Condition Trouble Area B1585 When a ...

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