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


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

CHECK TELEPHONE MICROPHONE ASSEMBLY

AUDIO AND VISUAL SYSTEM (for Radio and Display Type) - Microphone Circuit between Microphone and Radio Receiver


DESCRIPTION

Using this circuit, the radio and display receiver assembly sends power to the telephone microphone assembly, and the telephone microphone assembly sends microphone signals to the radio and display receiver assembly.

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).Audio And Visual System (For Radio And Display Type) Microphone Circuit Between Microphone And Radio Receiver


INSPECTION PROCEDURE

1.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
    H51-6 (SNS2) - W7-14 (SNS2)
    		Always
    		Below 1 Ω
    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
    H51-4 (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


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.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).Audio And Visual System (For Radio And Display Type) Microphone Circuit Between Microphone And Radio Receiver

  1. Remove the radio and display receiver assembly with its connectors still connected (LandCruiser RM000003AHY02NX.html).

  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

  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
Text in Illustration
*a
Component with harness connected
(Radio and Display Receiver Assembly)


NG
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000003YVJ042X.html)
OK


3.CHECK TELEPHONE MICROPHONE ASSEMBLY

  1. Replace the telephone microphone assembly with a known good one (LandCruiser RM000002LJJ04XX.html).

  1. Check that the malfunction disappears.

    OK:
    Malfunction disappears.


NG
REPLACE MAP LIGHT ASSEMBLY (LandCruiser RM000003YNP01KX.html)
OK

END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)