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: Diagnostic Tool Display - System Check Mode And LAN Monitor Screen

     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 TABLE
   
   

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

Fig 2: Identifying Radio Receiver Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the K53, K54 and K56 receiver connectors.
2. Measure the resistance of the receiver.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   K53-9 (TXM+) - K53-10 (TXM-)	60 to 80 Ω
   K54-5 (ATX+) - K54-15 (ATX-)	60 to 80 Ω
   K56-9 (TX+) - K56-10 (TX-)	60 to 80 Ω

NG: REPLACE RADIO RECEIVER ASSEMBLY 

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 OR 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