Toyota Tundra Service Manual: 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 a microphone connection detection signal line is disconnected.

DTC Code

DTC Detection Condition

Trouble Area

B1579

Telephone microphone signal is lost.

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

WIRING DIAGRAM

PROCEDURE

1.

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

(a) Disconnect the J135 navigation receiver assembly connector.

(b) Disconnect the W11 telephone microphone assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J135-4 (MACC) - W11-1 (MACC)

Always

Below 1 Ω

J135-5 (MIN+) - W11-2 (MIC+)

Always

Below 1 Ω

J135-19 (MIN-) - W11-4 (MIC-)

Always

Below 1 Ω

J135-6 (SNS2) - W11-3 (SNS2)

Always

Below 1 Ω

J135-4 (MACC) - Body ground

Always

10 kΩ or higher

J135-5 (MIN+) - Body ground

Always

10 kΩ or higher

J135-19 (MIN-) - Body ground

Always

10 kΩ or higher

J135-18 (SGND) - Body ground

Always

10 kΩ or higher

J135-6 (SNS2) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK NAVIGATION RECEIVER ASSEMBLY

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J135-18 (SGND) - Body ground

Always

Below 1 Ω

J135-19 (MIN-) - Body ground

Always

Below 1 Ω

*a

Component with harness connected

(Navigation Receiver Assembly)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

J135-4 (MACC) - Body ground

Ignition switch ACC

4 to 6 V

Result

Result

Proceed to

OK

A

NG (for Column Shift Type)

B

NG (for Floor Shift Type)

C

B

REPLACE NAVIGATION RECEIVER ASSEMBLY

C

REPLACE NAVIGATION RECEIVER ASSEMBLY

A

3.

CHECK TELEPHONE MICROPHONE ASSEMBLY

(a) Replace the telephone microphone assembly with a known good one (See page ).

(b) Check for DTCs (See page ).

OK:

No DTCs are output.

Result

Result

Proceed to

OK

A

NG (for Column Shift Type)

B

NG (for Floor Shift Type)

C

A

END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

B

REPLACE NAVIGATION RECEIVER ASSEMBLY

C

REPLACE NAVIGATION RECEIVER ASSEMBLY

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