Dtc B1579 Voice Recognition Microphone Disconnected

Audio Visual Telematics. Land Cruiser. Urj200, 202 Grj200 Vdj200
Navigation Multi Info Display. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)

CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY

INSPECT MAP LIGHT ASSEMBLY

CHECK MAP LIGHT ASSEMBLY

CHECK TELEPHONE MICROPHONE ASSEMBLY

DTC B1579 Voice Recognition Microphone Disconnected


DESCRIPTION

The multi-media module 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.
  1. Multi-media module receiver assembly
  2. Map light assembly
  3. Telephone microphone assembly
  4. Harness or connector

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Navigation Multi Info Display.Navigation System. Dtc B1579 Voice Recognition Microphone Disconnected


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)

  1. Disconnect the F77 multi-media module receiver assembly connector.

  1. Disconnect the R7 map light assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    F77-49 (SNS2) - R7-20 (SNS2)
    		Always
    		Below 1 Ω
    F77-29 (MACC) - R7-25 (ACC)
    		Always
    		Below 1 Ω
    F77-27 (MIN+) - R7-27 (MI1+)
    		Always
    		Below 1 Ω
    F77-48 (MIN-) - R7-26 (MIC-)
    		Always
    		Below 1 Ω
    F77-49 (SNS2) - Body ground
    		Always
    		10 kΩ or higher
    F77-29 (MACC) - Body ground
    		Always
    		10 kΩ or higher
    F77-27 (MIN+) - Body ground
    		Always
    		10 kΩ or higher
    F77-48 (MIN-) - Body ground
    		Always
    		10 kΩ or higher
    F77-28 (SGND) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Navigation Multi Info Display.Navigation System. 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
    F77-28 (SGND) - Body ground
    		Always
    		Below 1 Ω
    F77-48 (MIN-) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    F77-29 (MACC) - Body ground
    		Engine switch on (ACC)
    		4 to 6 V
Text in Illustration
*a
Component with harness connected
(Multi-media Module Receiver Assembly)


NG
REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY (Click here)
OK


3.INSPECT MAP LIGHT ASSEMBLY


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Navigation Multi Info Display.Navigation System. Dtc B1579 Voice Recognition Microphone Disconnected

  1. Remove the map light assembly (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    26 (MIC-) - 20 (SNS2)
    		Always
    		Below 1 Ω


NG
Go to step 5
OK


4.CHECK MAP LIGHT ASSEMBLY
Land Cruiser. Urj200, 202 Grj200 Vdj200.Navigation Multi Info Display.Navigation System. Dtc B1579 Voice Recognition Microphone Disconnected

  1. Turn the engine switch on (ACC).

  1. Connect an oscilloscope to terminals R7-27 (MI1+) and R7-26 (MIC-) of the map light assembly connector.

  1. Check the waveform of the telephone microphone assembly using the oscilloscope.

    Text in Illustration
    *a
    		Component with harness connected
    (Map Light Assembly)
    Result
    Result
    		Proceed to
    A waveform synchronized with the voice input to the map light assembly is not output.
    		A
    A waveform synchronized with the voice input to the map light assembly is output.
    		B


B
REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY (Click here)
A


5.CHECK TELEPHONE MICROPHONE ASSEMBLY

  1. Replace the telephone microphone assembly with a new or normally functioning one (Click here).

  1. Check if the same DTC is output again.

    Result
    Result
    		Proceed to
    No DTCs are output.
    		A
    DTCs are output.
    		B


B
REPLACE MAP LIGHT ASSEMBLY (Click here)
A

END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)