Navigation System (For Radio And Display Type) Microphone Circuit Between Microphone And Radio Receiver


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY)

CHECK TELEPHONE MICROPHONE ASSEMBLY

NAVIGATION SYSTEM (for Radio and Display Type) - Microphone Circuit between Microphone and Radio Receiver


DESCRIPTION

This circuit sends a microphone signal from the telephone microphone assembly to the radio and display receiver assembly.
It also supplies power from the radio and display receiver assembly to the telephone microphone assembly.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Navigation Multi Info Display.Navigation System (For Radio And Display Type).Navigation System (For Radio And Display Type) Microphone Circuit Between Microphone And Radio Receiver


INSPECTION PROCEDURE

1.CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Navigation Multi Info Display.Navigation System (For Radio And Display Type).Navigation System (For Radio And Display Type) Microphone Circuit Between Microphone And Radio Receiver

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H51-19 (MIN-) - Body ground
    		Always
    		Below 1 Ω
    H51-18 (SGND) - 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
    		Engine switch on (ACC)
    		4.75 to 5.25 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 - ROOF CONSOLE BOX ASSEMBLY)

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

  1. Disconnect the W7 roof console box 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. Check if the same problem occurs again.

    OK:
    Malfunction disappears.


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

END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)