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
   Gateway ECU (1C6)	GATEWAY ECU POWER SOURCE CIRCUIT
   Navigation ECU (178)	Navigation 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 multi-display and the component shown by the sub-code.
   1. Disconnect all connectors between the multi-display and the component shown by sub-code.
   2. Check for an open or short in the AVC-LAN circuit between the multi-display 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 MULTI-DISPLAY 

OK: END