Inspection Procedure

1. Enter the diagnostic mode.
2. Press the "LAN Mon" switch to change to "LAN Monitor" mode.
3. Identify the component shown by the sub-code.

   HINT:

   • "110 (multi-display)" is the component shown by the sub-code in the example shown in the illustration.
   • The sub-code will be indicated by its physical address.
   • For the component list, refer to "DIAGNOSIS DISPLAY DETAILED DESCRIPTION " .
     Fig 1: Identifying "LAN Monitor" Mode Screen Display

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 REFERENCE CHART
   
   

   Component	Proceed to
   Radio receiver (190)	RADIO RECEIVER POWER SOURCE CIRCUIT
   Stereo component amplifier (440)	STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT
   Multi-display (110)	MULTI-DISPLAY POWER SOURCE CIRCUIT
   Gateway ECU (1C6)	GATEWAY ECU POWER SOURCE CIRCUIT

1. Disconnect the R5 and R6 receiver connectors.
2. Measure the resistance of the receiver.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE CHART
   
   

   Tester Connection	Specified Condition
   R6-5 (TX+) - R6-15 (TX-)	60 to 80 Ω
   R5-9 (TX+) - R5-10 (TX-)	60 to 80 Ω

NG: REPLACE RADIO RECEIVER ASSEMBLY 

Fig 2: Check Radio Receiver Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step 

HINT:

• Start the check from the circuit that is near the component shown by the sub-code first.
• For details of the connectors, refer to "TERMINALS OF ECU " .

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. Disconnect all connectors between the navigation ECU and the component shown by sub-code.
   2. 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. 

      Fig 3: AVC-LAN Wiring Diagram

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to Next Step 

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