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

Toyota Tacoma 2015-2018 Service Manual / Navigation / Multi Info Display / Navigation System / Voice Recognition Microphone Disconnected (B1579)

DESCRIPTION

The navigation receiver assembly and telephone microphone assembly are connected to each other using the microphone connection detection signal lines.

This DTC is stored when the microphone connection detection signal is disconnected.

DTC Code

DTC Detection Condition

Trouble Area

B1579

Telephone microphone signal is lost.

  • Telephone microphone assembly
  • Navigation receiver assembly
  • Harness or connector

WIRING DIAGRAM

PROCEDURE

PROCEDURE

1.

INSPECT NAVIGATION RECEIVER ASSEMBLY

(a) Remove the navigation receiver assembly with connector still connected.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N25-19 (MIN-) - Body ground

Always

Below 1 Ω

*a

Component with harness connected

(Navigation Receiver Assembly)

NG

REPLACE NAVIGATION RECEIVER ASSEMBLY

OK

2.

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY)

(a) Disconnect the N25 navigation receiver assembly connector.

(b) Disconnect the T26 telephone microphone assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N25-6 (SNS2) - T26-3 (SNS2)

Always

Below 1 Ω

N25-19 (MIN-) - T26-4 (MIC-)

Always

Below 1 Ω

N25-6 (SNS2) - Body ground

Always

10 kΩ or higher

N25-19 (MIN-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT TELEPHONE MICROPHONE ASSEMBLY

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

(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)

OK

REPLACE NAVIGATION RECEIVER ASSEMBLY

NG

REPLACE TELEPHONE MICROPHONE ASSEMBLY

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