NAVIGATION SYSTEM > Display Signal Circuit between Navigation ECU and Television Camera ECU

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DESCRIPTION

This is the display signal circuit from the navigation ECU to the television camera ECU.

WIRING DIAGRAM


E111743E02


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - TELEVISION CAMERA ECU)


    E111731E02

  1. Disconnect the navigation ECU connector N3 and television camera ECU connector T15.

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    R - R1
    		Always
    		Below 1 Ω
    G - G1
    		Always
    		Below 1 Ω
    B - B1
    		Always
    		Below 1 Ω
    SYNC - SYN1
    		Always
    		Below 1 Ω
    VR - VR1
    		Always
    		Below 1 Ω
    VG - VG1
    		Always
    		Below 1 Ω
    R - Body ground
    		Always
    		10 kΩ or higher
    G - Body ground
    		Always
    		10 kΩ or higher
    B - Body ground
    		Always
    		10 kΩ or higher
    SYNC - Body ground
    		Always
    		10 kΩ or higher
    VR - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT NAVIGATION ECU (OUTPUT SIGNAL)


    E111765E02

  1. Reconnect the navigation ECU connector N3.

  1. Measure the waveform according to the table below.

    OK:
    Tester connection
    		Condition
    		Specified condition
    R1 - Body ground
    		Navigation map is switched
    		A waveform synchronized with display signals is output
    G1 - Body ground
    		Navigation map is switched
    		A waveform synchronized with display signals is output
    B1 - Body ground
    		Navigation map is switched
    		A waveform synchronized with display signals is output
    SYN1 - Body ground
    		Navigation display is ON
    		A waveform synchronized with display signals is output

    HINT:
    The waveform pattern may differ from those shown in the illustrations below due to differences in oscilloscope setting. A normal navigation ECU operating condition can be determined if any waveform is output.



    E111832E01

  1. Oscilloscope wave

    1. Terminal: SYNC - Body ground
      Setting: 500 mV/DIV 10 μs/DIV
      Condition: Navigation display is ON.

    2. Terminal: R, G, B - Body ground
      Setting: 200 mV/DIV 10 μs/DIV
      Condition: Navigation map is switched.



NG
REPLACE NAVIGATION ECU
OK

RETURN TO THE ORIGINAL INSPECTION FLOW BECAUSE THE CHECK RESULT IS NORMAL