NAVIGATION SYSTEM (for HDD) > Display does not Dim when Light Control Switch is Turned ON

for Preparation Click here


DESCRIPTION

When the navigation system is activated with the light control switch in the tail or head position, before AVC-LAN communication is established, the multi-display dims the display according to the illumination signal received via a direct line.
After AVC-LAN communication is established, the multi-display dims the display according to a dimmer signal sent via AVC-LAN communication.
The navigation computer sub-assembly switches between the daytime screen and night screen on the multi-display according to the illumination signal input.

WIRING DIAGRAM


E210159E03


INSPECTION PROCEDURE

NOTICE:
Inspect the fuse for circuits related to this system before performing the following inspection procedure.

1.CONFIRM SYMPTOMS

  1. Check the symptoms that occur by viewing the display.

    Result:
    Result
    		Proceed to
    There is a delay until the display dims after the navigation system is activated with the light control switch in the tail or head position.
    		A
    The display dims for a moment and then becomes bright after the navigation system is activated with the light control switch in the tail or head position.
    		B
    When the light control switch is set to the tail or head position, the display dims but does not switch to the night screen.
    		B
    When the light control switch is set to the tail or head position, the display neither dims nor switches to the night screen.
    		C

    HINT:
    1. When the navigation system is activated with the light control switch in the tail or head position, before AVC-LAN communication is established, the multi-display dims the display according to the illumination signal received via a direct line.
    2. After AVC-LAN communication is established, the multi-display dims the display according to a dimmer signal sent via AVC-LAN communication.
    3. The navigation computer sub-assembly switches between the daytime screen and night screen on the multi-display according to the illumination signal input.



B
Go to step 4

C
GO TO LIGHTING SYSTEM (Click here)
A


2.CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H20-6 (GND1) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H20-4 (ILL) - H20-6 (GND1)
    		Light control switch in the tail or head position
    		11 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT MULTI-MEDIA MODULE WIRE


    E210158E08

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



    E210164E08

  1. Disconnect the DC1 multi-media module wire connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H20-4 (ILL) - DC1-2 (ILL)
    		Always
    		Below 1 Ω
    H20-6 (GND1) - DC1-13 (GND1)
    		Always
    		Below 1 Ω

Text in Illustration 
*a
Component without harness connected
(Multi-media Module Wire)


NG
REPLACE MULTI-MEDIA MODULE WIRE (Click here)
OK

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

4.CHECK IMAGE QUALITY SETTING


    E181029E02

  1. Press the "DISP" switch on the remote touch.

  1. Turn the light control switch to the tail position.

  1. Check if "Day mode" on the display adjustment screen is on.

    Result:
    Result
    		Proceed to
    "Day mode" is on
    		A
    "Day mode" is off
    		B

Text in Illustration 
*a
Example


B
Go to step 5
A

TURN "Day mode" SETTING OFF 

5.CHECK VEHICLE SIGNAL (ILLUMINATION SIGNAL)


    E176538

  1. Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check (Click here).

  1. Check that the display changes between ON and OFF according to the light control switch operation.

    OK:
    Light Control Switch
    		Display
    Tail or head
    		ON
    Off
    		OFF

    HINT:
    The display is updated once per second. It is normal for the display to lag behind the actual switch operation.



NG
Go to step 6
OK

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

6.CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

  1. Disconnect the H60 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
    H60-10 (GND1) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H60-12 (ILL+) - H60-10 (GND1)
    		Light control switch in the tail or head position
    		11 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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