Dtc B1579 Voice Recognition Microphone Disconnected


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, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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
    H51-18 (SGND) - Body ground
    		Always
    		Below 1 Ω
    H51-19 (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
    H51-4 (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 (LandCruiser RM000003AHY02NX.html)
OK


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

  1. Disconnect the H51 radio and display receiver assembly connector.

  1. Disconnect the W7 map light assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H51-4 (MACC) - W7-11 (MACC)
    		Always
    		Below 1 Ω
    H51-5 (MIN+) - W7-12 (MCO+)
    		Always
    		Below 1 Ω
    H51-19 (MIN-) - W7-13 (MCO-)
    		Always
    		Below 1 Ω
    H51-6 (SNS2) - W7-14 (SNS2)
    		Always
    		Below 1 Ω
    H51-4 (MACC) - Body ground
    		Always
    		10 kΩ or higher
    H51-5 (MIN+) - Body ground
    		Always
    		10 kΩ or higher
    H51-19 (MIN-) - Body ground
    		Always
    		10 kΩ or higher
    H51-18 (SGND) - Body ground
    		Always
    		10 kΩ or higher
    H51-6 (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 (LandCruiser RM000002LJJ04XX.html).

  1. Clear the DTCs (LandCruiser RM0000014CZ0EQX.html).

  1. Check for DTCs (LandCruiser RM0000014CZ0EQX.html).

    OK:
    No DTCs are output.


NG
REPLACE MAP LIGHT ASSEMBLY (LandCruiser RM000003YO9019X.html)
OK

END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)