Toyota 4Runner: Voice Recognition Microphone Disconnected (B1579)

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Audio / Video / Audio And Visual System / Voice Recognition Microphone Disconnected (B1579)

DESCRIPTION

The radio and display receiver assembly and map light assembly (telephone 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 Code	DTC Detection Condition	Trouble Area
B1579	Telephone microphone signal is lost.	Map light assembly Telephone 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
G49-19 (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 - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

(a) Disconnect the G49 radio and display receiver assembly connector.

(b) Disconnect the U2 map light assembly (telephone microphone assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G49-6 (SNS2) - U2-15 (SNS2)	Always	Below 1 Ω
G49-19 (MIN-) - U2-12 (MCO-)	Always	Below 1 Ω
G49-6 (SNS2) - Body ground	Always	10 kΩ or higher
G49-19 (MIN-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
U2-15 (SNS2) - U2-12 (MCO-)	Always	Below 1 Ω

Text in Illustration

*a	Component without harness connected (Map Light Assembly (Telephone Microphone Assembly))

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

4.	REPLACE TELEPHONE MICROPHONE ASSEMBLY

(a) Replace the telephone microphone assembly (See page ).

(b) Clear the DTCs (See page ).

OK:

No DTCs are output.

END

REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

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