NAVIGATION SYSTEM (for HDD) > DVD Image Signal Circuit between Radio Receiver and Navigation ECU

for Preparation Click here


DESCRIPTION

This circuit sends a DVD image signal from the radio receiver assembly to the navigation computer sub-assembly.

WIRING DIAGRAM


E181062E39


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR

  1. Disconnect the H50 radio receiver assembly 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
    H50-8 (NTSC) - H61-9 (VV+)
    		Always
    		Below 1 Ω
    H50-22 (GND) - H61-20 (VV-)
    		Always
    		Below 1 Ω
    H50-8 (NTSC) - Body ground
    		Always
    		10 kΩ or higher
    H50-22 (GND) - Body ground
    		Always
    		10 kΩ or higher
    H50-7 (SLD) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT RADIO RECEIVER ASSEMBLY (DVD IMAGE SIGNAL)


    E176671E42

  1. Reconnect the H50 radio receiver assembly connector.

  1. Check the waveform according to the table below.



    E181025E36

  1. Oscilloscope waveform
    Item
    		Content
    Measurement terminal
    		H50-8 (NTSC) - Body ground
    Measurement setting
    		200 mV/DIV., 10 μs/DIV.
    Condition
    		 DVD is playing on multi-display

    HINT:
    The video waveform changes according to the image output from the radio receiver assembly to the navigation computer sub-assembly, but the synchronization signal does not change.

    Text in Illustration 
    *a
    		Component with harness connected
    (Radio Receiver Assembly)
    *b
    		Synchronization Signal
    *c
    		Video Waveform



NG
REPLACE RADIO RECEIVER ASSEMBLY (Click here)
OK

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