Dtc B1579 Voice Recognition Microphone Disconnected

Audio Visual Telematics. Land Cruiser. Urj200, 202 Grj200 Vdj200
Audio Video. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

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

CHECK TELEPHONE MICROPHONE ASSEMBLY

DTC B1579 Voice Recognition Microphone Disconnected


DESCRIPTION

The radio and display 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. Radio and display receiver assembly
  2. Roof console box assembly
  3. Telephone microphone assembly
  4. Harness or connector

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Audio Video.Audio And Visual System (For Radio Receiver Type). Dtc B1579 Voice Recognition Microphone Disconnected


INSPECTION PROCEDURE

HINT:
When replacing the radio and display receiver assembly, it is necessary to perform the vehicle contract setting for Connected Services (w/ Connected Services Function).
1.CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Audio Video.Audio And Visual System (For Radio Receiver 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
    F124-18 (SGND) - Body ground
    		Always
    		Below 1 Ω
    F124-19 (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
    F124-4 (MACC) - Body ground
    		Engine switch on (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 (Click here)
OK


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

  1. Disconnect the F124 radio and display 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
    F124-4 (MACC) - R7-25 (ACC)
    		Always
    		Below 1 Ω
    F124-5 (MIN+) - R7-27 (MI1+)
    		Always
    		Below 1 Ω
    F124-19 (MIN-) - R7-26 (MIC-)
    		Always
    		Below 1 Ω
    F124-6 (SNS2) - R7-20 (SNS2)
    		Always
    		Below 1 Ω
    F124-4 (MACC) - Body ground
    		Always
    		10 kΩ or higher
    F124-5 (MIN+) - Body ground
    		Always
    		10 kΩ or higher
    F124-19 (MIN-) - Body ground
    		Always
    		10 kΩ or higher
    F124-18 (SGND) - Body ground
    		Always
    		10 kΩ or higher
    F124-6 (SNS2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK TELEPHONE MICROPHONE ASSEMBLY

  1. Replace the telephone microphone assembly with a known good one (Click here).

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    OK:
    No DTCs are output.


NG
REPLACE MAP LIGHT ASSEMBLY (Click here)
OK

END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)