Dtc B1579 Voice Recognition Microphone Disconnected


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK MICROPHONE (OPERATION CHECK)

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER - MAP LIGHT)

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

REPLACE TELEPHONE MICROPHONE WITH ANOTHER AND CHECK

DTC B1579 Voice Recognition Microphone Disconnected


DESCRIPTION

Microphone signal from the telephone microphone assembly is sent to the radio and display receiver assembly.
Also, power is supplied from the radio and display receiver assembly to the telephone microphone assembly.
If microphone signal is disconnected, this DTC is stored.
This DTC is stored when a malfunction occurs in a connected device.

DTC Code
DTC Detection Condition
Trouble Area
B1579
Telephone microphone signal is lost.
  1. Map light assembly (telephone microphone assembly)
  2. Radio and display receiver assembly

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Audio Visual.Audio And Visual System (For Radio And Display Type). Dtc B1579 Voice Recognition Microphone Disconnected


INSPECTION PROCEDURE

HINT:
For vehicles equipped with an Extension Module, refer to optional equipment's manuals.
1.CHECK MICROPHONE (OPERATION CHECK)

  1. Enter the "Microphone & Voice Recognition Check" screen (Toyota Fortuner RM0000043X901RX.html).



    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50

  1. When voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

    OK:
    Check result is normal.


NG
Go to step 2
OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY (Toyota Fortuner RM000003OQ9003X.html)

2.CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER - MAP LIGHT)

  1. Disconnect the R19 radio and display receiver assembly connector.

  1. Disconnect the M4 map light assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R19-4 (MACC) - M4-4 (MACC)
    		Always
    		Below 1 Ω
    R19-5 (MIN+) - M4-3 (MCO+)
    R19-19 (MIN-) - M4-2 (MCO-)
    R19-6 (SNS2) - Body ground
    R19-4 (MACC) - Body ground
    		Always
    		10 kΩ or higher
    R19-5 (MIN+) - Body ground
    R19-19 (MIN-) - Body ground
    R19-18 (SGND) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Audio Visual.Audio And Visual System (For Radio And Display Type). Dtc B1579 Voice Recognition Microphone Disconnected

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R19-18 (SGND) - Body ground
    		Always
    		Below 1 Ω
    R19-19 (MIN-) - Body ground

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    R19-4 (MACC) - Body ground
    		Ignition switch ACC
    		4 to 6 V
    Text in Illustration
    *a
    		Component with harness connected
    (Radio and Display Receiver Assembly)


NG
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY (Toyota Fortuner RM000003OQ9003X.html)
OK


4.REPLACE TELEPHONE MICROPHONE WITH ANOTHER AND CHECK

  1. Replace the telephone microphone with a normal one (Toyota Fortuner RM000002LJJ02AX.html).

  1. Check if the same problem occurs again.

    OK:
    Malfunction disappears.


NG
REPLACE MAP LIGHT ASSEMBLY (Toyota Fortuner RM000001GED00NX.html)
OK

END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)