Toyota Tacoma (2015-2018) Service Manual: Voice Recognition Microphone Disconnected (B1579)

Toyota Tacoma (2015-2018) Service Manual / Audio / Video / Audio And Visual System / Voice Recognition Microphone Disconnected (B1579)

DESCRIPTION

The radio and display receiver assembly and 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.	Telephone microphone assembly Radio and display receiver assembly Harness or connector

WIRING DIAGRAM

PROCEDURE

1.	INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Remove the radio and display receiver assembly with connectors still connected.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R31-19 (MIN-) - Body ground	Always	Below 1 Ω

*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 - TELEPHONE MICROPHONE ASSEMBLY)

(a) Disconnect the R31 radio and display receiver assembly connector.

(b) Disconnect the T26 telephone microphone assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
R31-6 (SNS2) - T26-3 (SNS2)	Always	Below 1 Ω
R31-19 (MIN-) - T26-4 (MIC-)	Always	Below 1 Ω
R31-6 (SNS2) - Body ground	Always	10 kΩ or higher
R31-19 (MIN-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT TELEPHONE MICROPHONE ASSEMBLY

(a) Remove the telephone microphone assembly.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (SNS2) - 4 (MIC-)	Always	Below 1 Ω

*a	Component without harness connected (Telephone Microphone Assembly)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

REPLACE TELEPHONE MICROPHONE ASSEMBLY

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