NAVIGATION SYSTEM > Navigation ECU Communication Error

for Preparation Click here


INSPECTION PROCEDURE

1.IDENTIFY THE COMPONENT SHOWN BY THE SUB-CODE


    E111829E05

  1. Enter the diagnostic mode.

  1. Press the "LAN Mon" switch to change to "LAN Monitor" mode.

  1. Identify the component shown by the sub-code.

    HINT:
    1. The "110 (multi-display)" is the component shown by the sub-code in the example shown in the illustration.
    2. The sub-code will be indicated by its physical address.
    3. For the component list, refer to "DIAGNOSIS DISPLAY DETAILED DESCRIPTION" (Click here).


NEXT


2.CHECK POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE

  1. Inspect the power source circuit of the component shown by the sub-code.
    If the power source circuit is operating normally, proceed to the next step.

    Component Table 
    Component
    		Proceed to
    Radio Receiver (190)
    		Radio receiver power source circuit (Click here)
    Stereo Component Amplifier (440)
    		Stereo component amplifier power source circuit (Click here)
    Multi-display (110)
    		Multi-display power source circuit (Click here)
    Gateway ECU (1C6)
    		Gateway ECU power source circuit (Click here)
    Television Camera ECU (280)
    		Television camera ECU power source circuit (Click here)


NEXT


3.INSPECT RADIO RECEIVER
E110926E01

  1. Disconnect the radio receiver connectors.

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

    Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    ATX+ (R2-5) -
    ATX- (R2-15)
    		Always
    		60 to 80 Ω
    TX+ (R3-9) -
    TX- (R3-10)
    		Always
    		60 to 80 Ω



NG
REPLACE RADIO RECEIVER
OK


4.CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - COMPONENT SHOWN BY SUB-CODE)

HINT:
  1. Start the check from the circuit that is near the component shown by the sub-code first.
  2. For details of the connectors, refer to the "Terminals of ECU" (Click here).



  1. Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the navigation ECU and the component shown by the sub-code.



    1. Check for an open or short in the AVC-LAN circuit between the navigation ECU and the component shown by the sub-code.

      OK:
      There is no open or short circuit.


      E111828E02



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE COMPONENT SHOWN BY SUB-CODE

  1. Replace the component shown by the sub-code with a normal one and check if the same problem occurs again.

    OK:
    Same problem does not occur.



NG
REPLACE NAVIGATION ECU
OK

END