NAVIGATION SYSTEM (for HDD) > Visual Mute Signal Circuit between Navigation ECU and Multi-display

for Preparation Click here


DESCRIPTION

The navigation computer sub-assembly sends a visual mute signal to the multi-display. As a result, a black screen is inserted when the screen changes so that noise and distorted images are not displayed.
When an open exists in the circuit, noise and distorted images will be displayed instead of a black screen.
When a short exists in the circuit, even though the multi-display is operating normally, noise and distorted images will be displayed (black screen will not be displayed) during screen changes or the black screen will always be displayed.

WIRING DIAGRAM


E210163E03


INSPECTION PROCEDURE

1.INSPECT MULTI-MEDIA MODULE WIRE


    E187388E03

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H20-9 (VMT1) - Body ground
    		Power switch on (ACC), screen display changes.
    		3.5 V or higher → Below 1 V → 3.5 V or higher

Text in Illustration 
*a
Component with harness connected
(Multi-media Module Wire)


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

2.CHECK HARNESS AND CONNECTOR

  1. Disconnect the H20 multi-media module wire connector.

  1. Disconnect the H61 navigation computer sub-assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H20-9 (VMT1) - H61-11 (VMTF)
    		Always
    		Below 1 Ω
    H20-9 (VMT1) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.REPLACE MULTI-MEDIA MODULE WIRE

  1. Replace the multi-media module wire and check if the navigation system operates normally (Click here).

    OK:
    The navigation system operates normally.



NG
Go to step 4
OK

END 

4.REPLACE MULTI-DISPLAY

  1. Replace the multi-display and check if the navigation system operates normally (Click here).

    OK:
    The navigation system operates normally.



NG
REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY (Click here)
OK

END